2009年4月15日 · CDC activated its Emergency Operations Center (EOC) to support the H1N1 Influenza pandemic. The 2009 H1N1 was a unique combination of influenza virus genes never previously identified in either animals or people. This new influenza was first detected in a 10-year-old patient in California on April 15, 2009.

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.

2024年12月27日 · Of the 818 influenza A viruses subtyped during Week 51, 356 (43.5%) were influenza A (H1N1)pdm09, 461 (56.4%) were A (H3N2), and 1 (0.1%) were A (H5). • Five confirmed influenza A (H5) cases were reported to CDC this week. To date, human-to-human transmission of influenza A (H5) virus has not been identified in the United States.

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 ...

There have been nearly 30,000 confirmed H1N1 cases across 74 countries. The reports have shown sharp increase in the number of infections reported in recent days from Chile, Japan, and the UK, and other parts of the world, with the most dramatic increase recorded in Australia where more than 1200 cases were reported in a very short duration.

2025年2月26日 · The number of influenza cases is surging across the United States, putting significant strain on many hospitals. ... H1N1 is a subtype of the influenza A virus, a family of viruses capable of ...

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.

2024年9月2日 · H1N1 influenza infections can cause symptoms such as rhinorrhea, rigors, myalgia, headache, fever, chills, loss of appetite, and, possibly, lower respiratory tract disease and gastrointestinal disease. Rarely, H1N1 influenza can lead to acute respiratory distress syndrome and secondary bacterial sepsis.

2024年3月10日 · During the 2009 influenza pandemic, uncertainty surrounding the seriousness of human infections with the H1N1pdm09 virus hindered appropriate public health response. One measure of seriousness is the case fatality risk, defined as the probability of mortality among people classified as cases.

2019年6月11日 · From April 12, 2009 to April 10, 2010, CDC estimated there were 60.8 million cases (range: 43.3-89.3 million), 274,304 hospitalizations (range: 195,086-402,719), and 12,469 deaths (range: 8868-18,306) in the United States due to the (H1N1)pdm09 virus.