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They are a result of things people do to nature. Disease, it turns out, is largely an environmental issue. Sixty percent of emerging infectious diseases that affect humans are zoonotic â they originate in animals. And more than two-thirds of those originate in wildlife.
One strain of virus that may produce a pandemic in the future is a highly pathogenic variation of the H5N1 subtype of influenza A virus. On 11 June 2009, a new strain of H1N1 influenza was declared to be a global pandemic (Stage 6) by the WHO after evidence of spreading in the southern hemisphere.