Before the H1N1 pandemic in 2009, the influenza A (H1N1) virus had never been identified as a cause of infections in people. Genetic analyses of this virus have shown that it originated from animal influenza viruses and is unrelated to the human seasonal H1N1 viruses that have been in general circulation among people since 1977.

2010年6月19日 · As of 27 June, worldwide more than 214 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including over 18239 deaths. WHO is actively monitoring the progress of the pandemic through frequent consultations with the WHO Regional Offices and Member States and through ...

2025年2月28日 · Currently circulating in humans are subtype A (H1N1) and A (H3N2) influenza viruses. The A (H1N1) is also written as A (H1N1)pdm09 as it caused the pandemic in 2009 and replaced the previous A (H1N1) virus which had circulated prior to 2009. Only influenza type A viruses are known to have caused pandemics.

An outbreak of febrile respiratory infection was detected in Mexico in March 2009, and later identified to be due to Pandemic H1N1 2009. The World Health Organization declared the Pandemic H1N1 2009 to be a public health emergency of international concern in April 2009.

Influenza A virus subtype H1N1 (A/H1N1) is a subtype of influenza A virus (IAV). Some human-adapted strains of H1N1 are endemic in humans and are one cause of seasonal influenza (flu). [1] Other strains of H1N1 are endemic in pigs (swine influenza) and in birds (avian influenza). [2]

More than 214 countries and overseas territories worldwide had reported laboratory-confirmed cases of pandemic (H1N1) 2009 virus infection, with approximately 18 500 reported deaths. The influenza pandemic was classified as mild in nature compared to past pandemics.

关于减轻2009年h1n1流感大流行影响的联合行动呼吁 “世界卫生组织、红十字与红新月会国 际联合会、联合国系统流感协调员、联合国 人道主义事务协调厅和联合国儿童基金会* 出于迫切的人道主义考虑，将与红十字会和 红新月会、非政府组织和民间社团等合作伙

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The 2009 H1N1 pandemic provided the world with a valuable opportunity to test global capacity to respond to a public health emergency. The success of the WHO Deployment Initiative was based upon the careful and flexible planning of activities, and upon open and transparent communications between all involved parties.

美国国立卫生研究院审查得出2009年甲型h1n1流感疫苗安全性，类似于季节性流感疫苗的结论。 美国流感疫苗有效性网络2011年一项研究，估计甲型h1n1流感疫苗的总体有效性达56%。2013年1月28日cdc的研究显示，h1n1流感疫苗在美国预计大约救助300人，保护约100万人。