Subtype of the influenza A virus, with some strains that are swine flue, others avian flue.
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1Health officials say the H1N1 virus is not linked to meat products.
2Vietnam requires any suspected H1N1 cases to be isolated for seven days.
3The World Health Organisation declared an H1N1 influenza epidemic on June 11.
4NETHERLANDS - The Netherlands started vaccinating children against the H1N1 on Monday.
5The number of cases of H1N1 flu in Japan has topped 300.
6The World Health Organisation declared an H1N1 influenza pandemic on June 11.
7Six deaths are being investigated for possible links to the H1N1 virus.
8Last week, the WHO described H1N1 as the fastest-moving pandemic ever seen.
9There have been no reports of deaths from H1N1 flu in China.
10However, H1N1 viruses disproportionately affected middle-aged adults during the 2013-2014 influenza season.
11However, no increase in heterosubtypic cross-neutralization of Group1-H1N1 seasonal strains was observed.
12During the study period, 157 patients presented with subsequently proven H1N1 infection.
13She said H1N1 pandemic flu was now widespread across the United States.
14Initial tests at the city's tropical diseases hospital were positive for H1N1.
15When news broke of the new H1N1 strain, they ran more tests.
16Last year's top words were Twitter, Obama and the flu virus H1N1.