The Bird Flu is an Influenza Type A virus. The outer layer of a viral particle is called its “capsid” or coat. The coat contains two major glycoprotein types—specifically hemagglutinin, symbolized H, and neuraminidase, N. One of the deadliest varieties of bird flu is H5N1, the five meaning the fifth variety of hemagglutinin. Part of the reason it is so dangerous is the infrequency with which it crosses the species boundary from bird to human—little immunity to it exists in the host. Such potential danger invites attack by bio-terrorists. Keep up-to-date in your understanding of avian or bird flu by reading technical, yet understandable articles written by Bright Hub contributors.
Virus (gold) in MDCK (green)
CDC/ Courtesy of Cynthia Goldsmith, Jacqueline Katz, and Sharif R. Zaki, 1997

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