Influenza viruses circulating in animal species such as pigs or birds can sporadically infect humans, causing mild to very severe diseases, reported the European Centre for Disease Prevention and Control (ECDC).
These viruses have the potential to severely affect public health, such as during the epidemics of avian influenza H5N1 in Egypt or H7N9 in China, or the 2009 H1N1 influenza pandemic caused by a virus initially spreading from pigs to humans.
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