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79-450: Richard Rusczyk ( / ˈ r ʌ s ɪ k / ; Polish: [ˈrustʂɨk] ; born September 21, 1971) is the founder and chief executive officer of Art of Problem Solving Inc. (as well as the website, which serves as a mathematics forum and place to hold online classes) and a co-author of the Art of Problem Solving textbooks. Rusczyk was a national Mathcounts participant in 1985, and he won

158-625: A healthy diet are also recommended. Supportive care in severe cases includes treatment to relieve symptoms , fluid therapy , oxygen support and prone positioning , and medications or devices to support other affected vital organs. More severe cases may need treatment in hospital. In those with low oxygen levels, use of the glucocorticoid dexamethasone is recommended to reduce mortality. Noninvasive ventilation and, ultimately, admission to an intensive care unit for mechanical ventilation may be required to support breathing. Extracorporeal membrane oxygenation (ECMO) has been used to address

237-627: A variant of concern (VoC) or a variant of interest (VoI). Many of these variants have shared the more infectious D614G . As of May 2023, the WHO had downgraded all variants of concern to previously circulating as these were no longer detected in new infections. Sub-lineages of the Omicron variant (BA.1 – BA.5) were considered separate VoCs by the WHO until they were downgraded in March 2023 as no longer widely circulating. As of 24 September 2024 ,

316-488: A company's business decisions, including those in operations, marketing, business development , finance, human resources , etc. The use of the CEO title is not necessarily limited to describing the head of a company. For example, the CEO of a political party is often entrusted with fundraising, particularly for election campaigns. In some countries, there is a dual board system with two separate boards, one executive board for

395-493: A comprehensive international study. Such deaths include deaths due to healthcare capacity constraints and priorities, as well as reluctance to seek care (to avoid possible infection). Further research may help distinguish the proportions directly caused by COVID-19 from those caused by indirect consequences of the pandemic. In May 2022, the WHO estimated the number of excess deaths by the end of 2021 to be 14.9 million compared to 5.4 million reported COVID-19 deaths, with

474-424: A corporation or company typically reports to the board of directors and is charged with maximizing the value of the business, which may include maximizing the profitability , market share , revenue , or another financial metric. In the nonprofit and government sector, CEOs typically aim at achieving outcomes related to the organization's mission, usually provided by legislation . CEOs are also frequently assigned

553-402: A facade of charm and eloquence. Traits such as courage and risk-taking, generally considered desirable, are often found alongside these psychopathic tendencies. Tara Swart, a neuroscientist at MIT Sloan School of Management , has suggested that individuals with psychopathic traits thrive in chaotic environments and are aware that others do not. As a result, they may intentionally create chaos in

632-462: A formal delegation of authority regarding business administration . Typically, responsibilities include being an active decision-maker on business strategy and other key policy issues, as well as leader , manager, and executor roles. The communicator role can involve speaking to the press and to the public, as well as to the organization's management and employees; the decision-making role involves high-level decisions about policy and strategy. The CEO

711-595: A large number of people". During the COVID-19 pandemic, as with other pandemics, the meaning of this term has been challenged. The end of a pandemic or other epidemic only rarely involves the total disappearance of a disease, and historically, much less attention has been given to defining the ends of epidemics than their beginnings. The ends of particular epidemics have been defined in a variety of ways, differing according to academic field, and differently based on location and social group. An epidemic's end can be considered

790-451: A median range of 0.24% to 1.49%. IFRs rise as a function of age (from 0.002% at age 10 and 0.01% at age 25, to 0.4% at age 55, 1.4% at age 65, 4.6% at age 75, and 15% at age 85). These rates vary by a factor of ≈10,000 across the age groups. For comparison, the IFR for middle-aged adults is two orders of magnitude higher than the annualised risk of a fatal automobile accident and much higher than

869-824: A random sample have consistently found that total infections considerably exceed the reported case counts. Many countries, early on, had official policies to not test those with only mild symptoms. The strongest risk factors for severe illness are obesity, complications of diabetes , anxiety disorders, and the total number of conditions. During the start of the COVID-19 pandemic it was not clear whether young people were less likely to be infected, or less likely to develop symptoms and be tested. A retrospective cohort study in China found that children and adults were just as likely to be infected. Among more thorough studies, preliminary results from 9 April 2020 found that in Gangelt ,

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948-870: A related development, British politician Andy McDonald received praise for educating a CEO on the role of trade unions. This occurred as the restaurant chain McDonald's faced scrutiny in the UK Parliament over allegations of a toxic workplace culture. COVID-19 pandemic The COVID-19 pandemic (also known as the coronavirus pandemic and COVID pandemic ), caused by severe acute respiratory syndrome coronavirus 2 ( SARS-CoV-2 ), began with an outbreak of COVID-19 in Wuhan , China, in December 2019. It spread to other areas of Asia, and then worldwide in early 2020. The World Health Organization (WHO) declared

1027-410: A social phenomenon, not just a biological one. Time reported in March 2024 that expert opinions differ on whether or not COVID-19 is considered endemic or pandemic, and that the WHO continued to call the disease a pandemic on its website. During the initial outbreak in Wuhan , the virus and disease were commonly referred to as "coronavirus", "Wuhan coronavirus", "the coronavirus outbreak" and

1106-599: A source of criticism following a dramatic rise in pay relative to the average worker's wage . For example, the relative pay was 20-to-1 in 1965 in the US, but had risen to 376-to-1 by 2000. The relative pay differs around the world, and, in some smaller countries, is still around 20-to-1. Observers differ as to whether the rise is due to competition for talent or due to lack of control by compensation committees. In recent years, investors have demanded more say over executive pay. Lack of diversity amongst chief executives has also been

1185-504: A source of criticism. In 2018, 5% of Fortune 500 CEOs were women. In 2023 the number rose to 10.4% of for Women CEO's of Fortune 500 companies . The reasons for this are explained or justified in various ways, and may include biological sex differences, male and female differences in Big Five personality traits and temperament, sex differences in psychology and interests, maternity and career breaks, hypergamy , phallogocentrism ,

1264-451: A test. Conversely, deaths of people who died from underlying conditions following a positive test may be included. Countries such as Belgium include deaths from suspected cases, including those without a test, thereby increasing counts. Official death counts have been claimed to underreport the actual death toll, because excess mortality (the number of deaths in a period compared to a long-term average) data show an increase in deaths that

1343-549: A total of 20,528,472 posts on the site. Rusczyk has also published the Art of Problem Solving series of books aimed at a similar audience. The site also provides fee-based online mathematics classes, which range from Prealgebra to Group Theory and Calculus . Additionally, Art of Problem Solving offers Python programming classes and Olympiad level classes in Mathematics, Physics, Chemistry and Computer Science. They are collectively named WOOT . Rusczyk founded and serves on

1422-698: A vast community of over 500,000 math, computer science, and physics enthusiasts. In 2020, Mathcounts was canceled due to the COVID-19 pandemic . In its stead, Art of Problem Solving hosted the online Mathcounts Week. Art of Problem Solving also hosted the second round of the American Invitational Mathematics Examination as the American Online Invitational Mathematics Examination. Art of Problem Solving also hosted

1501-518: Is associated with COVID-19 and is reported in as many as 88% of cases. The disease is mainly transmitted via the respiratory route when people inhale droplets and small airborne particles (that form an aerosol ) that infected people exhale as they breathe, talk, cough, sneeze, or sing. Infected people are more likely to transmit COVID-19 when they are physically close to other non-infected individuals. However, infection can occur over longer distances, particularly indoors. SARS‑CoV‑2 belongs to

1580-611: Is discouraged altogether by the World Health Organization (WHO), due to limited evidence of its efficacy. The severity of COVID-19 varies. It may take a mild course with few or no symptoms, resembling other common upper respiratory diseases such as the common cold . In 3–4% of cases (7.4% for those over age 65) symptoms are severe enough to cause hospitalisation. Mild cases typically recover within two weeks, while those with severe or critical diseases may take three to six weeks to recover. Among those who have died,

1659-439: Is intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2), the virus that causes coronavirus disease 2019 ( COVID-19 ). Prior to the COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). This knowledge accelerated

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1738-490: Is not explained by COVID-19 deaths alone. Using such data, estimates of the true number of deaths from COVID-19 worldwide have included a range from 18.2 to 33.5 million (≈27.4 million) by 18 November 2023 by The Economist , as well as over 18.5 million by 1 April 2023 by the Institute for Health Metrics and Evaluation and ≈18.2 million (earlier) deaths between 1 January 2020, and 31 December 2021, by

1817-402: Is often used in lieu of chief executive officer. Business publicists since the days of Edward Bernays (1891–1995) and his client John D. Rockefeller (1839–1937) and even more successfully the corporate publicists for Henry Ford , promoted the concept of the " celebrity CEO". Business journalists have often adopted this approach, which assumes that the corporate achievements, especially in

1896-418: Is sometimes included as one such subordinate executive officer, but, as suggested by Anthony Johndrow, CEO of Reputation Economy Advisors, it can also be seen as "simply another way to add emphasis to the role of a modern-day CEO – where they are both the external face of, and the driving force behind, an organization culture". In the US, the term "chief executive officer" is used primarily in business, whereas

1975-427: Is tasked with implementing the goals, targets and strategic objectives as determined by the board of directors. As an executive officer of the company, the CEO reports the status of the business to the board of directors, motivates employees, and drives change within the organization. As a manager, the CEO presides over the organization's day-to-day operations. The CEO is the person who is ultimately accountable for

2054-452: Is the ratio of deaths to diagnoses. This metric can be misleading because of the delay between symptom onset and death and because testing focuses on symptomatic individuals. Based on Johns Hopkins University statistics, the global CFR was 1.02 percent (6,881,955 deaths for 676,609,955 cases) as of 10 March 2023. The number varies by region and has generally declined over time. Several variants have been named by WHO and labelled as

2133-406: Is the seventh known coronavirus to infect people, after 229E , NL63 , OC43 , HKU1 , MERS-CoV , and the original SARS-CoV . The standard method of testing for presence of SARS-CoV-2 is a nucleic acid test , which detects the presence of viral RNA fragments. As these tests detect RNA but not infectious virus, its "ability to determine duration of infectivity of patients is limited." The test

2212-542: Is to prevent a conflict of interest and too much power being concentrated in the hands of one person. In the United States, the board of directors (elected by the shareholders ) is often equivalent to the supervisory board, while the executive board may often be known as the executive committee (the division/subsidiary heads and C-level officers that report directly to the CEO). In the United States, and in business,

2291-614: Is typically done on respiratory samples obtained by a nasopharyngeal swab ; however, a nasal swab or sputum sample may also be used. The WHO has published several testing protocols for the disease. Preventive measures to reduce the chances of infection include getting vaccinated, staying at home or spending more time outdoors, avoiding crowded places, keeping distance from others, wearing a mask in public, ventilating indoor spaces, managing potential exposure durations, washing hands with soap and water often and for at least twenty seconds, practising good respiratory hygiene, and avoiding touching

2370-501: The American Mathematics Competitions in 2021 and 2022. The Art of Problem Solving website hosts online math courses. Sets of problems are included which is for homework. The website also hosts a large number of forums, where users can post math problems and play math & strategy games. The Art of Problem Solving wiki contains numerous formulas and additional information. During the COVID-19 pandemic ,

2449-658: The American Mathematics Competitions . Rusczyk would later go on to win the USA Math Olympiad (USAMO) and make the alternates for the USA team for the International Math Olympiad (IMO) . Rusczyk would later go on to attend Princeton University , which he graduated from in 1993. After graduating from college, Rusczyk went to graduate school which he would later quit to pursue becoming a high school teacher. In 1994, Rusczyk and Sandor Lehoczky wrote

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2528-552: The Dictionary says that the use of "CEO" as an acronym for a chief executive officer originated in Australia , with the first attestation being in 1914. The first American usage cited is from 1972. The responsibilities of an organization's CEO are set by the organization's board of directors or other authority, depending on the organization's structure. They can be far-reaching or quite limited, and are typically enshrined in

2607-514: The Huanan Seafood Wholesale Market there, but it is possible that human-to-human transmission began earlier. Molecular clock analysis suggests that the first cases were likely to have been between October and November 2019. The scientific consensus is that the virus is most likely of a zoonotic origin, from bats or another closely related mammal. While other explanations such as speculations that SARS-CoV-2

2686-407: The Institute for Health Metrics and Evaluation estimating the true number of cases as of early 2022 to be in the billions. One measure that public health officials and policymakers have used to monitor the pandemic and guide decision-making is the test positivity rate ("percent positive"). According to Johns Hopkins in 2020, one benchmark for a "too high" per cent positive is 5%, which was used by

2765-777: The USA Math Olympiad (USAMO) in 1989. He is one of the co-creators of the Mandelbrot Competition , and the director of the USA Mathematical Talent Search (USAMTS). He also founded the San Diego Math Circle. Richard Rusczyk was born in Idaho Falls, Idaho in 1971. He signed up for the MathCounts program when he was in middle school. As a high schooler, Rusczyk was a part of his high school math team and took part in

2844-602: The basic reproduction number (R 0 ) for COVID-19 in January 2020 were between 1.4 and 2.5, but a subsequent analysis claimed that it may be about 5.7 (with a 95 per cent confidence interval of 3.8 to 8.9). In December 2021, the number of cases continued to climb due to several factors, including new COVID-19 variants. As of that 28   December, 282,790,822 individuals worldwide had been confirmed as infected. As of 14 April 2022 , over 500 million cases were confirmed globally. Most cases are unconfirmed, with

2923-474: The variants of interest as specified by the World Health Organization are BA.2.86 and JN.1, and the variants under monitoring are JN.1.7, KP.2, KP.3, KP.3.1.1, JN.1.18, LB.1, and XEC. Symptoms of COVID-19 are variable, ranging from mild symptoms to severe illness. Common symptoms include headache, loss of smell and taste , nasal congestion and runny nose , cough, muscle pain , sore throat , fever, diarrhoea , and breathing difficulties . People with

3002-429: The "Wuhan coronavirus outbreak", with the disease sometimes called "Wuhan pneumonia ". In January 2020, the WHO recommended 2019-nCoV and 2019-nCoV acute respiratory disease as interim names for the virus and disease per 2015 international guidelines against using geographical locations (e.g. Wuhan, China), animal species, or groups of people in disease and virus names in part to prevent social stigma . WHO finalised

3081-563: The Art of Problem Solving Volumes 1 and 2 with Sandor Lehoczky. Rusczyk studied chemical engineering at Princeton University and graduated Summa Cum Laude in 1993. He previously served on the board for ARML and managed the Western ARML site. Chief executive officer CEOs find roles in various organizations, including public and private corporations , nonprofit organizations , and even some government organizations (notably state-owned enterprises ). The governor and CEO of

3160-727: The Art of Problem Solving books, designed to prepare students for mathematical competitions by teaching them concepts and problem-solving methods rarely taught in school. These books lent their name to the company he founded in 2003. After working for four years as a bond trader for D. E. Shaw & Co. , Rusczyk created the Art of Problem Solving website, which provides resources for middle and high school students to develop their mathematics and problem-solving abilities. These include real-time competitions to solve math problems and online tools to learn how to solve problems with increasing difficulty as well as math forums. As of November 28, 2023, there have been 1,019,175 students, 1,691,990 topics, and

3239-535: The CEO is also the president, is the vice president (VP). An organization may have more than one vice president, each tasked with a different area of responsibility (e.g., VP of finance, VP of human resources). Examples of subordinate executive officers who typically report to the CEO include the chief operating officer (COO), chief financial officer (CFO), chief strategy officer (CSO), chief marketing officer (CMO) and chief business officer (CBO). The public relations -focused position of chief reputation officer

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3318-528: The UK, chief executive and chief executive officer are used in local government , where their position in law is described as the "head of paid service", and in business and in the charitable sector . As of 2013 , the use of the term director for senior charity staff is deprecated to avoid confusion with the legal duties and responsibilities associated with being a charity director or trustee, which are normally non-executive (unpaid) roles. The term managing director

3397-640: The WHO in the past. As of 10 March 2023, more than 6.88   million deaths had been attributed to COVID-19. The first confirmed death was in Wuhan on 9 January 2020. These numbers vary by region and over time, influenced by testing volume, healthcare system quality, treatment options, government response, time since the initial outbreak, and population characteristics, such as age, sex, and overall health. Multiple measures are used to quantify mortality. Official death counts typically include people who died after testing positive. Such counts exclude deaths without

3476-419: The WHO, US, European Union, and Australia. On 12 November 2022, the WHO released its Global Vaccine Market Report. The report indicated that "inequitable distribution is not unique to COVID-19 vaccines"; countries that are not economically strong struggle to obtain vaccines. On 14 November 2022, the first inhalable vaccine was introduced, developed by Chinese biopharmaceutical company CanSino Biologics , in

3555-422: The arena of manufacturing, are produced by uniquely talented individuals, especially the "heroic CEO". In effect, journalists celebrate a CEO who takes distinctive strategic actions. The model is the celebrity in entertainment, sports, and politics – compare the " great man theory ". Guthey et al. argues that "...these individuals are not self-made, but rather are created by a process of widespread media exposure to

3634-664: The board of the nonprofit Art of Problem Solving Initiative, which manages the United States of America Mathematical Talent Search (USAMTS) and finances numerous local math initiatives around the United States. In 2012, Rusczyk won the Mathcounts distinguished alumnus award. In 2014, Rusczyk won the Paul Erdős Award from the World Federation of National Mathematics Competitions. Art of Problem Solving also has

3713-448: The broad family of viruses known as coronaviruses . It is a positive-sense single-stranded RNA (+ssRNA) virus, with a single linear RNA segment. Coronaviruses infect humans, other mammals, including livestock and companion animals, and avian species. Human coronaviruses are capable of causing illnesses ranging from the common cold to more severe diseases such as Middle East respiratory syndrome (MERS, fatality rate ≈34%). SARS-CoV-2

3792-617: The case of a partnership , an executive officer is a managing partner, senior partner, or administrative partner. In the case of a limited liability company , an executive officer is any member, manager, or officer. Depending on the organization, a CEO may have several subordinate executives to help run the day-to-day administration of the company, each of whom has specific functional responsibilities referred to as senior executives, executive officers or corporate officers. Subordinate executives are given different titles in different organizations, but one common category of subordinate executive, if

3871-648: The centre of a major infection cluster in Germany, 15 per cent of a population sample tested positive for antibodies . Screening for COVID-19 in pregnant women in New York City , and blood donors in the Netherlands, found rates of positive antibody tests that indicated more infections than reported. Seroprevalence -based estimates are conservative as some studies show that persons with mild symptoms do not have detectable antibodies. Initial estimates of

3950-760: The city of Shanghai, China. For the first two years of the pandemic, no specific and effective treatment or cure was available. In 2021, the European Medicines Agency's (EMA) Committee for Medicinal Products for Human Use (CHMP) approved the oral antiviral protease inhibitor , Paxlovid (nirmatrelvir plus the HIV antiviral ritonavir ), to treat adult patients. FDA later gave it an EUA. Most cases of COVID-19 are mild. In these, supportive care includes medication such as paracetamol or NSAIDs to relieve symptoms (fever, body aches, cough), adequate intake of oral fluids and rest. Good personal hygiene and

4029-484: The cumulative number of infected individuals (including asymptomatic and undiagnosed infections and excluding vaccinated infected individuals). It is expressed in percentage points. Other studies refer to this metric as the infection fatality risk . In November 2020, a review article in Nature reported estimates of population-weighted IFRs for various countries, excluding deaths in elderly care facilities, and found

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4108-450: The day-to-day business and one supervisory board for control purposes (selected by the shareholders). In these countries, the CEO presides over the executive board and the chairperson presides over the supervisory board, and these two roles will always be held by different people. This ensures a distinction between management by the executive board and governance by the supervisory board. This allows for clear lines of authority. The aim

4187-441: The development of various vaccine platforms during early 2020. The initial focus of SARS-CoV-2 vaccines was on preventing symptomatic and severe illness. The COVID-19 vaccines are widely credited for their role in reducing the severity and death caused by COVID-19. As of March 2023, more than 5.5 billion people had received one or more doses (11.8 billion in total) in over 197 countries. The Oxford-AstraZeneca vaccine

4266-506: The executive officers are usually the top officers of a corporation, the chief executive officer (CEO) being the best-known type. The definition varies; for instance, the California Corporate Disclosure Act defines "executive officers" as the five most highly compensated officers not also sitting on the board of directors. In the case of a sole proprietorship , an executive officer is the sole proprietor. In

4345-562: The existence of old boy networks , tradition, and the lack of female role models in that regard. Some countries have passed laws mandating boardroom gender quotas. In 2023 Rockefeller Foundation awarded a grant to Korn Ferry to research strategies and then action a plan to help more women to become CEO's. There are contentious claims that a significant number of CEO's have psychopathic tendencies, often characterized by power-seeking behavior and dominance. These individuals can often conceal their ruthlessness and antisocial behavior behind

4424-513: The eyes, nose, or mouth with unwashed hands. Those diagnosed with COVID-19 or who believe they may be infected are advised by healthcare authorities to stay home except to get medical care, call ahead before visiting a healthcare provider, wear a face mask before entering the healthcare provider's office and when in any room or vehicle with another person, cover coughs and sneezes with a tissue, regularly wash hands with soap and water and avoid sharing personal household items. A COVID-19 vaccine

4503-474: The general public beginning in December 2020, made available through government and international programs such as COVAX , aiming to provide vaccine equity . Treatments include novel antiviral drugs and symptom control. Common mitigation measures during the public health emergency included travel restrictions , lockdowns , business restrictions and closures, workplace hazard controls , mask mandates , quarantines, testing systems, and contact tracing of

4582-665: The infected. The pandemic caused severe social and economic disruption around the world, including the largest global recession since the Great Depression . Widespread supply shortages , including food shortages , were caused by supply chain disruptions and panic buying . Reduced human activity led to an unprecedented temporary decrease in pollution . Educational institutions and public areas were partially or fully closed in many jurisdictions, and many events were cancelled or postponed during 2020 and 2021. Telework became much more common for white-collar workers as

4661-439: The issue of respiratory failure. Existing drugs such as hydroxychloroquine , lopinavir/ritonavir , and ivermectin are not recommended by US or European health authorities, as there is no good evidence they have any useful effect. The antiviral remdesivir is available in the US, Canada, Australia, and several other countries, with varying restrictions; however, it is not recommended for use with mechanical ventilation, and

4740-576: The majority of the unreported 9.5 million deaths believed to be direct deaths due the virus, rather than indirect deaths. Some deaths were because people with other conditions could not access medical services . A December 2022 WHO study estimated excess deaths from the pandemic during 2020 and 2021, again concluding ≈14.8 million excess early deaths occurred, reaffirming and detailing their prior calculations from May as well as updating them, addressing criticisms. These numbers do not include measures like years of potential life lost and may make

4819-495: The official names COVID-19 and SARS-CoV-2 on 11 February 2020. Tedros Adhanom Ghebreyesus explained: CO   for corona , VI   for virus , D   for disease and 19 for when the outbreak was first identified (31 December 2019). WHO additionally uses "the COVID-19 virus" and "the virus responsible for COVID-19" in public communications. WHO named variants of concern and variants of interest using Greek letters . The initial practice of naming them according to where

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4898-534: The outbreak a public health emergency of international concern (PHEIC) on 30 January 2020, and assessed the outbreak as having become a pandemic on 11 March. COVID-19 symptoms range from asymptomatic to deadly, but most commonly include fever, sore throat , nocturnal cough , and fatigue. Transmission of the virus is often through airborne particles . Mutations have produced many strains (variants) with varying degrees of infectivity and virulence . COVID-19 vaccines were developed rapidly and deployed to

4977-407: The pandemic 2021's leading cause of death . The time between symptom onset and death ranges from   6 to 41 days, typically about 14 days. Mortality rates increase as a function of age. People at the greatest mortality risk are the elderly and those with underlying conditions. The infection fatality ratio (IFR) is the cumulative number of deaths attributed to the disease divided by

5056-495: The pandemic evolved. Misinformation circulated through social media and mass media , and political tensions intensified . The pandemic raised issues of racial and geographic discrimination , health equity , and the balance between public health imperatives and individual rights . The WHO ended the PHEIC for COVID-19 on 5 May 2023. The disease has continued to circulate, but as of 2024, experts were uncertain as to whether it

5135-409: The point that their actions, personalities, and even private lives function symbolically to represent significant dynamics and tensions prevalent in the contemporary business atmosphere". Journalism thereby exaggerates the importance of the CEO and tends to neglect harder-to-describe broader corporate factors. There is little attention to the intricately organized technical bureaucracy that actually does

5214-415: The population's age structure and the age-specific pattern of infections. There have also been reviews that have compared the fatality rate of this pandemic with prior pandemics, such as MERS-CoV. For comparison the infection mortality rate of seasonal flu in the United States is 0.1%, which is 13 times lower than COVID-19. Another metric in assessing death rate is the case fatality ratio (CFR), which

5293-462: The risk of dying from seasonal influenza . In December 2020, a systematic review and meta-analysis estimated that population-weighted IFR was 0.5% to 1% in some countries (France, Netherlands, New Zealand, and Portugal), 1% to 2% in other countries (Australia, England, Lithuania, and Spain), and about 2.5% in Italy. This study reported that most of the differences reflected corresponding differences in

5372-774: The role of the main manager of the organization and the highest-ranking officer in the C-suite . The term "chief executive officer" is attested as early as 1782, when an ordinance of the Congress of the Confederation of the United States of America used the term to refer to governors and other leaders of the executive branches of each of the Thirteen Colonies . In draft additions to the Oxford English Dictionary published online in 2011,

5451-496: The same infection may have different symptoms, and their symptoms may change over time. Three common clusters of symptoms have been identified: one respiratory symptom cluster with cough, sputum , shortness of breath, and fever; a musculoskeletal symptom cluster with muscle and joint pain, headache, and fatigue; a cluster of digestive symptoms with abdominal pain, vomiting, and diarrhoea. In people without prior ear, nose, and throat disorders, loss of taste combined with loss of smell

5530-409: The term "executive director" is used primarily in the not-for-profit sector. These terms are generally mutually exclusive and refer to distinct legal duties and responsibilities. The CEO is the highest-ranking executive in a company, making corporate decisions, managing operations, allocating resources, and serving as the main point of communication between the board of directors and the company. In

5609-411: The time from symptom onset to death has ranged from two to eight weeks. Prolonged prothrombin time and elevated C-reactive protein levels on admission to the hospital are associated with severe course of COVID-19 and with a transfer to intensive care units (ICU). Between 5% and 50% of COVID-19 patients experience long COVID , a condition characterised by long-term consequences persisting after

5688-694: The typical convalescence period of the disease. The most commonly reported clinical presentations are fatigue and memory problems, as well as malaise , headaches, shortness of breath , loss of smell, muscle weakness , low fever and cognitive dysfunction . Many countries attempted to slow or stop the spread of COVID-19 by recommending, mandating or prohibiting behaviour changes, while others relied primarily on providing information. Measures ranged from public advisories to stringent lockdowns. Outbreak control strategies are divided into elimination and mitigation. Experts differentiate between elimination strategies (known as " zero-COVID ") that aim to completely stop

5767-543: The variants were identified (e.g. Delta began as the " Indian variant") is no longer common. A more systematic naming scheme reflects the variant's PANGO lineage (e.g., Omicron 's lineage is B.1.1.529) and is used for other variants. SARS-CoV-2 is a virus closely related to bat coronaviruses , pangolin coronaviruses, and SARS-CoV . The first known outbreak (the 2019–2020 COVID-19 outbreak in mainland China ) started in Wuhan , Hubei, China, in December 2019. Many early cases were linked to people who had visited

5846-629: The website additionally began hosting several math and science competitions. These include the American Mathematics Competitions , American Invitational Mathematics Examination , United States of America Mathematical Olympiad , the Putnam Competition , F=ma examination , USA Biolympiad , and Mathcounts . Richard Rusczyk has both authored and co-authored several textbooks for students in grades 5–12, including Pre-algebra, Introduction to Algebra, Introduction to Geometry, and many others. During his studies at Princeton University, he also wrote

5925-457: The work. Hubris sets in when the CEO internalizes the celebrity and becomes excessively self-confident in making complex decisions. There may be an emphasis on the sort of decisions that attract the celebrity journalists . Research published in 2009 by Ulrike Malmendier and Geoffrey Tate indicates that "firms with award-winning CEOs subsequently underperform, in terms both of stock and of operating performance". Executive compensation has been

6004-802: The workplace. This perspective is explored in the book Snakes in Suits , co-authored by Robert D. Hare . However, Scott Lilienfeld has argued that the attention given to psychopathy in the workplace by both the media and scholars has far exceeded the available scientific evidence. Emilia Bunea, writing in Psychology Today , has linked psychopathic traits in managers to workplace bullying , employee dissatisfaction, and turnover intentions. Despite this, Bunea cautions that excessive worry about supposed psychopathic managers could discourage individuals from pursuing careers in corporations and deter employees from addressing issues with difficult bosses. In

6083-443: Was accidentally released from a laboratory have been proposed, as of 2021 these were not supported by evidence. Official "case" counts refer to the number of people who have been tested for COVID-19 and whose test has been confirmed positive according to official protocols whether or not they experienced symptomatic disease. Due to the effect of sampling bias , studies which obtain a more accurate number by extrapolating from

6162-457: Was still a pandemic. Pandemics and their ends are not well-defined, and whether or not one has ended differs according to the definition used. As of 24 November 2024, COVID-19 has caused 7,075,455 confirmed deaths. The COVID-19 pandemic ranks as the fifth- deadliest pandemic or epidemic in history . In epidemiology , a pandemic is defined as "an epidemic occurring over a very wide area, crossing international boundaries, and usually affecting

6241-509: Was the most widely used. According to a June 2022 study, COVID-19 vaccines prevented an additional 14.4 million to 19.8 million deaths in 185 countries and territories from 8 December 2020 to 8 December 2021. On 8 November 2022, the first recombinant protein-based COVID-19 vaccine (Novavax's booster Nuvaxovid ) was authorised for use in adults in the United Kingdom. It has subsequently received endorsement/authorisation from

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