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.

The 2009 H1N1 flu pandemic is estimated to have actually caused about 284,000 (range from 150,000 to 575,000) excess deaths by the WHO-USCDC study and 148,000–249,000 excess respiratory deaths by the WHO-NIVEL study.

2020年9月8日 · This activity provides a comprehensive review of the presentation, evaluation, and management of H1N1 influenza, emphasizing the essential role of an interprofessional healthcare team in caring for affected patients affected by the H1N1 influenza virus.

Among those with influenza A subtype information, 574 (43.3%) were A(H1N1) pdm09 and 753 (56.7%) were A(H3N2). When examining rates by age, the highest cumulative hospitalization rate per 100,000 population was among adults aged 65 years and older (68.4), followed by adults aged 50-64 years (25.9), children aged 0-4 years (22.3), adults aged 18 ...

2019年6月11日 · Since the 2009 H1N1 pandemic, the (H1N1)pdm09 flu virus has circulated seasonally in the U.S. causing significant illnesses, hospitalizations, and deaths. Additionally, CDC estimated that 151,700-575,400 people worldwide died from (H1N1)pdm09 virus infection during the first year the virus circulated.**

2024年5月13日 · The WHO GISRS laboratories tested more than 350429 specimens during that time period. 20741 were positive for influenza viruses, of which 17211 (82.98%) were typed as influenza A and 3530 (17.02%) as influenza B. Of the sub-typed influenza A viruses, 6275 (63.52%) were influenza A (H1N1)pdm09 and 3604 (36.48%) were influenza A (H3N2).

2012年6月27日 · The researchers estimate that the pandemic virus caused 201,200 respiratory deaths and another 83,300 deaths from cardiovascular disease associated with H1N1 infections. They also calculate that Africa and Southeast Asia, which have 38% of the world's population, accounted for a disproportionate 51% of the deaths.

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 ...

Through July 2009, a total of 43,677 laboratory-confirmed cases of influenza A pandemic (H1N1) 2009 were reported in the United States, which is likely a substantial underestimate of the true number. Correcting for under-ascertainment using a multiplier model, we …

2012年6月27日 · More than 3 years after the emergence of the 2009 pandemic influenza A H1N1 virus, the associated global mortality remains unclear. Of 18 500 laboratory-confirmed pandemic-associated deaths identified during April, 2009, to April, 2010, worldwide, less than 12% were reported from Africa and southeast Asia, although these regions are home to ...