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Photo Gallery: Influenza
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Photo: Flu virus
Photo: Masked baseball playerPhoto: Nurses and flu patients in tentsPhoto: Spanish flu tissue samplesPhoto: Flu virusPhoto: Scientist drilling eggsPhoto: Woman cooking near pigs and ducksPhoto: Biologists releasing duckPhoto: Seniors waiting for scarce flu vaccinePhoto: Veterinary workers disinfecting carPicture: Pigs
Spreading potentially lethal pathogens, influenza virus particles (brown) invade cilia (blue) in the airways of the human lung.
Image by Karsten Schneider/Science Photo Library

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