What to Know About the H5N9 Bird Flu
In late January, scientists at the World Organization for Animal Health (WOAH) reported the first cases of H5N9 avian influenza in the U.S., on a duck farm in California.
The latest strain isn’t a surprise, say public-health experts, since influenza takes different forms in different species and is constantly mutating. But the appearance of H5N9 is still concerning, especially in light of the ongoing outbreaks in chickens and cows of H5N1.
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Here’s what to know.
Why bird flu is so rampant right now
“We’ve never seen a global spread of avian influenza virus like this,” says Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota. “We’ve seen an explosion in the number of outbreaks in poultry and duck operations over the course of recent weeks. This reflects the fact that there is so much H5N1 in migrating waterfowl.”
There are about 40 million migratory aquatic waterfowl in North America, ..