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Colorized transmission electron micrograph of Avian influenza A H5N1 viruses (seen in gold) grown in MDCK cells (seen in green). Avian influenza A viruses do not usually infect humans; however, several instances of human infections and outbreaks have been reported since 1997. When such infections occur, public health authorities monitor these situations closely.
Content Providers(s): CDC/ Courtesy of Cynthia Goldsmith, Jacqueline Katz, and Sharif R. Zaki, 1997
Picture & text from CDC/PHIL. For more information see Bird Flu Virus Pictures from CDC