Subtype of the influenza A virus, with some strains that are swine flue, others avian flue.
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Health officials say the H1N1 virus is not linked to meat products.
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Vietnam requires any suspected H1N1 cases to be isolated for seven days.
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The World Health Organisation declared an H1N1 influenza epidemic on June 11.
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NETHERLANDS - The Netherlands started vaccinating children against the H1N1 on Monday.
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The number of cases of H1N1 flu in Japan has topped 300.
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The World Health Organisation declared an H1N1 influenza pandemic on June 11.
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Six deaths are being investigated for possible links to the H1N1 virus.
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Last week, the WHO described H1N1 as the fastest-moving pandemic ever seen.
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There have been no reports of deaths from H1N1 flu in China.
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However, H1N1 viruses disproportionately affected middle-aged adults during the 2013-2014 influenza season.
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However, no increase in heterosubtypic cross-neutralization of Group1-H1N1 seasonal strains was observed.
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During the study period, 157 patients presented with subsequently proven H1N1 infection.
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She said H1N1 pandemic flu was now widespread across the United States.
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Initial tests at the city's tropical diseases hospital were positive for H1N1.
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When news broke of the new H1N1 strain, they ran more tests.
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Last year's top words were Twitter, Obama and the flu virus H1N1.