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Avian Influenza FAQs:

Are all types of avian influenza equally dangerous?

Only the H5 and H7 types are known to be able to change from the low-pathogenic form to the highly pathogenic form, so these are the types of greatest concern. Only a few specific avian influenza viruses have been shown to infect humans, and even those infections have been rare. Most of the human cases worldwide have been caused by H5N1 HPAI in Asia and H7N7 in The Netherlands. Some types of avian influenza are so mild that a blood test is needed to confirm that it is present.