CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY
Avian influenza research. Microbiologist injecting a solution of H5N1 avian influenza viruses into a chicken egg. A chicken egg is used as a large number of viruses are needed for research and viruses can only replicate within host cells. Once a sufficient concentration has been reached the samples will be used in research to study the pathogenicity and transmission ability of emerging H5N1 viruses. This research will help in the early identification of H5N1 viruses with pandemic potential. Humans that come into contact with infected birds can become infected themselves, but as of March 2006 no human to human transmission had been recorded. Photographed in the Influenza Branch at the Centre for Disease Control and Prevention, Atlanta, Georgia, USA.
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