Avian influenza virus, TEM

Avian influenza virus, TEM

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Credit: DR GOPAL MURTI/SCIENCE PHOTO LIBRARY

Caption: Avian influenza virus, type A strain H5N1, coloured transmission electron micrograph (TEM). This virus was isolated from a duck in Hong Kong, during the avian flu outbreak in 1997. The virus consists of ribonucleic acid (RNA), surrounded by a nucleocapsid and a lipid envelope (orange). In the envelope are two types of protein spike, haemagglutinin (H) and neuraminidase (N), which determine the strain of virus. The natural hosts of this virus are wild birds, which show few symptoms, however infected domestic birds suffer a 90-100% mortality rate. Humans that have contact with infected birds can become infected, but as of November 2005 no human to human transmission has been recorded.

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