Each time H5N1 infects a mammal, mutations that increase its infectivity can occur.
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It has been detected in birds on every continent except Australia, seals in South America, foxes in Canada, and even poultry and dairy cows in the United States, as well as dozens of farm workers who came into contact with them, and is now highly contagious. H5N1 avian influenza has also been detected. The virus first infected pigs in the United States.
This development is undoubtedly worrying. This gives the virus its best evolutionary opportunity ever…
Source: www.newscientist.com
