The World Health Organization voiced alarm Thursday at the growing spread of H5N1 bird flu to new species, including humans, who face an "extraordinarily high" mortality rate. But in the hundreds of cases where humans have been infected through contact with animals, "the mortality rate is extraordinarily high", Farrar said.
The World Health Organization voiced alarm Thursday at the growing spread of H5N1 bird flu to new species, including humans, who face an "extraordinarily high" mortality rate. But in the hundreds of cases where humans have been infected through contact with animals, "the mortality rate is extraordinarily high", Farrar said.
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