Avian influenza virus particles. Coloured transmission electron micrograph (TEM) of a H5 strain of influenza virus type A. All five H5 strains (H5N1,
Avian influenza virus particles. Coloured transmission electron micrograph (TEM) of a H5 strain of influenza virus type A. All five H5 strains (H5N1, H5N2, H5N3, H5N8 and H5N9) cause bird flu. The particles have an enveloped outer coat, called a capsid (red). The capsid contains haemagglutinin (H) and neuraminidase (N) proteins, which allow the particles to enter the host's cells and reproduce. The first bird flu (H5N1) outbreak was seen in Scottish chickens in 1959. The natural hosts of the virus are wild birds, which can pass the virus to other species, such as domestic birds, pigs, horses and humans.
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Photo credit: © AMI IMAGES/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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