U.S. health officials remain on the alert for additional cases of a new swine flustrain that infected three Iowa children this month.
Since July, 10 Americans have been sickened by S-OtrH3N2 viruses that picked up a gene from the 2009 H1N1 swine flu pandemic, the federal Centers for Disease Control and Prevention reported. The new flu strain combines a rare influenza virus (H3N2) circulating in North American pigs and the H1N1 virus from the 2009 outbreak. New flu strains develop when flu viruses combine in new ways. They can pose health risks because people haven’t yet developed immunity to them.
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