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The smallest life forms known that live inside the living cells of organisms, such as animals, plants and bacteria and often cause disease. They are made up of a chromosome surrounded by a protein shell.

Contributors in Viruses


Ventricular fibrillation

Anatomy; Allergies and allergens

An erratic, disorganised firing of impulses from the ventricles. The ventricles quiver and are unable to contract or pump blood to the body. This is a medical emergency that must be treated with ...


Medical; Viruses

A germ that can cause serious infections in humans, such as strep throat and pneumonia.

Ebola virus disease

Medical; Viruses

Ebola virus disease is the name for the human virus infection and disease that is caused by any of four of the five known ebola viruses. These four viruses are: Bundibugyo virus, Ebola virus, Sudan ...

West Nile virus

Health care; Viruses

A mosquito-borne zoonotic arbovirus belonging to the genus Flavivirus in the family Flaviviridae. This flavivirus is found in temperate and tropical regions of the world. It was first identified in ...

Bovine syncytial virus (BSV)

Health care; Viruses

The bovine syncytial virus, a member of the retroviral subfamily Spumavirinae, causes a persistent, asymptomatic infection in cattle. Named for its characteristic cytopathic effect, BSV causes the ...

Argentine hemorrhagic fever virus

Health care; Viruses

A New World arenavirus that cause a slow developing fever, malaise, headache, muscular pains, nausea, vomiting in the beginning stage. Later symptoms include petechiae or blood spots on the upper ...

Abelson murine leukaemia virus

Health care; Viruses

A retrovirus belonging to the family Retroviridae that is associated with leukaemia and induces in vitro transformation of certain mouse cells. As a retrovirus, it has a single-stranded, positive ...

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