H7N9 Bird Flu May Be Developing Drug Resistance

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Some strains of the H7N9 bird flu in China are becoming resistant to the only antiviral drugs doctors have left to treat the infection, a new study suggests. The study, which examined the viruses in a single person infected with H7N9, found that a portion of the H7N9 viruses lurking inside the person were resistant to the antiviral drugsoseltamivir (marketed as Tamiflu) and zanamivir (Relenza). About 35 percent of the viruses were resistant to these drugs, while 65 percent were sensitive, the researchers said.
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