A pandemic could be '100 times worse than Covid' and kill up to half of everyone it infects, experts have warned — as the says it is 'monitoring' the situation.Speaking at a briefing, virus researchers said the H5N1 strain of bird may now be getting 'dangerously close' to triggering a pandemic.Multiple cases of the infection in a variety of mammals, including cows, cats and, more recently, humans, are all raising the risk of the virus mutating to become more transmissible, they said.
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