In epidemiology , a disease vector is any living agent that carries and transmits an infectious pathogen such as a parasite or microbe, to another living organism. Agents regarded as vectors are mostly blood-sucking insects such as mosquitoes. The first major discovery of a disease vector came from Ronald Ross in 1897, who discovered the malaria pathogen when he dissected the stomach tissue of a mosquito .
16-492: VBD may refer to: Vector-borne disease , a type of infectious disease Violent by Design , an album by Jedi Mind Tricks Violent By Design (professional wrestling) , a professional wrestling stable in Impact Wrestling Voltage at Break-down Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with
32-456: A fungal zoospore that causes high rates of mortality in amphibians . Zoospores are composed of a microtubular cytoskeleton base which extends from the base of the flagellum. The complexity and structure of this cytoskeleton is variable and is largely dependent on volume and size. One common feature of zoospores is their asymmetrical shape; a result of the ventral grove housing the flagella base. Certain zoospores progress through different phases,
48-401: A major group of pathogen vectors with mosquitoes , flies , sand flies , lice , fleas , ticks , and mites transmitting a huge number of pathogens. Many such vectors are haematophagous , which feed on blood at some or all stages of their lives. When the insects feed on blood, the pathogen enters the blood stream of the host. This can happen in different ways. The Anopheles mosquito,
64-557: A resurgence in zoonotic disease across the world. Examples of vector-borne zoonotic diseases include: Many factors affect the incidence of vector-borne diseases. These factors include animals hosting the disease, vectors, and people. Humans can also be vectors for some diseases, such as Tobacco mosaic virus , physically transmitting the virus with their hands from plant to plant. The World Health Organization (WHO) states that control and prevention of vector-borne diseases are emphasizing "Integrated Vector Management (IVM)", which
80-518: A vector for malaria , filariasis , and various arthropod-borne-viruses ( arboviruses ), inserts its delicate mouthpart under the skin and feeds on its host's blood. The parasites the mosquito carries are usually located in its salivary glands (used by mosquitoes to anaesthetise the host). Therefore, the parasites are transmitted directly into the host's blood stream. Pool feeders such as the sand fly and black fly , vectors for pathogens causing leishmaniasis and onchocerciasis respectively, will chew
96-423: A well in the host's skin, forming a small pool of blood from which they feed. Leishmania parasites then infect the host through the saliva of the sand fly. Onchocerca force their own way out of the insect's head into the pool of blood. Triatomine bugs are responsible for the transmission of a trypanosome , Trypanosoma cruzi , which causes Chagas disease . The Triatomine bugs defecate during feeding and
112-414: Is an approach that looks at the links between health and environment, optimizing benefits to both. In April 2014, WHO launched a campaign called "Small bite, big threat" to educate people about vector-borne illnesses. WHO issued reports indicating that vector-borne illnesses affect poor people, especially people living in areas that do not have adequate levels of sanitation, drinking water and housing. It
128-479: Is estimated that over 80% of the world's population resides in areas under threat of at least one vector borne disease. Zoospore A zoospore is a motile asexual spore that uses a flagellum for locomotion in aqueous or moist environments. Also called a swarm spore, these spores are created by some protists , bacteria , and fungi to propagate themselves. Certain zoospores are infectious and transmittable, such as Batrachochytrium dendrobatidis ,
144-479: The Oomycota ). Developing sporangia of oomycetes go through a process of cleavage in which a protein kinase , in the case of Phytophthora infestans , induces the sporangial cytoplasm to split and release the various zoospores. Release of the spores can occur either inside of the zoosporangium (intrasporangial zoosporogenesis) or exteriorly (extrasporangial zoosporogenesis). Spores absorb water and travel through
160-415: The distinction is not always clear. In the case of Puccinia graminis for example, Berberis and related genera act as alternate hosts in a cycle of infection of grain. More directly, when they twine from one plant to another, parasitic plants such as Cuscuta and Cassytha have been shown to convey phytoplasmal and viral diseases between plants. Rabies is transmitted through exposure to
176-412: The excrement contains the parasites, which are accidentally smeared into the open wound by the host responding to pain and irritation from the bite. There are several species of Thrips that act as vectors for over 20 viruses, especially Tospoviruses , and cause all sorts of plant diseases . Some plants and fungi act as vectors for various pathogens. For example, the big-vein disease of lettuce
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#1732790630647192-412: The first phase commonly referred to as 'the initial'. Others form cysts that vary tremendously in volume (14-4905 cubic micrometers) and shape, each with distinctive hair structures. Zoospores may possess one or more distinct types of flagella - tinsel or "decorated", and whiplash, in various combinations. Both tinsel and whiplash flagella beat in a sinusoidal wave pattern, but when both are present,
208-476: The saliva or brain tissue of an infected animal. Any warm-blooded animal can carry rabies, but the most common vectors are dogs , skunks , raccoons , and bats . Several articles, recent to early 2014, warn that human activities are spreading vector-borne zoonotic diseases. Several articles were published in the medical journal The Lancet , and discuss how rapid changes in land use , trade globalization , climate change and "social upheaval" are causing
224-479: The tinsel beats in the opposite direction of the whiplash, to give two axes of control of motility . Attachment to the base of the zoospore is variable between taxa and may help with identification of species. In eukaryotes , the four main types of zoospore are illustrated in Fig. 1 at right: A zoosporangium is the asexual structure ( sporangium ) in which the zoospores develop in plants, fungi, or protists (such as
240-463: The title VBD . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=VBD&oldid=1179784727 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Vector-borne disease Arthropods form
256-571: Was long thought to be caused by a member of the fungal division Chytridiomycota , namely Olpidium brassicae . Eventually, however, the disease was shown to be viral. Later it transpired that the virus was transmitted by the zoospores of the fungus and also survived in the resting spores. Since then, many other fungi in Chytridiomycota have been shown to vector plant viruses. Many plant pests that seriously damage important crops depend on other plants, often weeds, to harbour or vector them;
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