A study found that some strains of the H7N9 bird flu virus in China were drug-resistant and can go undetected in laboratory tests. Researchers found that 35% of the viruses taken from the first person known to be infected with H7N9 were resistant to oseltamivir and zanamivir. "We'd better get some vaccine seed stocks up and ready. The antiviral option for controlling H7N9 isn't too good," the study's corresponding author said.
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