TOKYO, Oct 8 (Reuters) - A genetic mutation of H1N1 swine flu that is resistant to the antiviral drug Tamiflu has been detected in a Japanese teenager who had not previously been treated with the drug, a Japanese health official said.
The mutation was detected by health officials in Sapporo, northern Japan, in a teenage girl who had developed a fever on Aug. 22. She was given GlaxoSmithkline's Relenza and recovered a day later, the ministry said in a statement.
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