The spread of H5N1 avian influenza in North America has prompted governments to increase vaccine stocks and precautionary measures as infections rise among livestock and humans.
A study published in the journal Science highlighted a genetic change in circulating H5N1, potentially enabling it to jump from mammals to humans more easily.
We're particularly worried about pigs because we know from many other outbreaks that pigs are a mixing vessel for influenza viruses, which could lead to a dangerous pathogen.
Though no cases of human-to-human transmission have been recorded, there are concerns that the H5N1 variant could mutate into a significant public health issue.
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