A new study warns that a deadly strain of bird flu could evolve to infect and kill humans in the future.
The study reported the first case of mammal-to-mammalian transmission of the H5N1 avian influenza virus on a mink farm in Spain.
The case would involve increasing the risk of mutation and adaptation of the virus to other mammals, including humans.
Bird flu has a high mortality rate in birds and humans and could cause a global pandemic if it spreads widely.
Some vaccine manufacturers are developing or testing bird flu vaccines as a precaution, but most doses are reserved for rich countries.
Experts fear that the shortage of vaccines in underdeveloped countries could worsen the situation if the virus mutates, according to Popular Mechanics.
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