Many influenza viruses are animal – porcine, avian or other species – viruses which normally do not cross the species barrier. The cases of A(H7N9) are of concern because these are the first reported cases of this avian influenza virus in humans. See Disease Outbreak News for updates.
Frequently Asked Questions on human infection with A(H7N9) avian influenza virus, China
Art and Science of Laboratory Medicine
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