For this reason CDC monitors influenza activity levels and trends and virus characteristics through a nationwide surveillance system and uses statistical modeling to estimate the burden of flu illness (including hospitalizations and deaths) in the United States. The latest estimates released on January 15, 2010 incorporate an additional 4 weeks of flu data (from November 15, 2009 through December 12, 2009) from the previous estimates released on December 10, 2009. On June 11, the World Health Organization declared the virus a pandemic. There were 12,469 US deaths … “These are not deaths in age groups where you are expecting them,” she said. There were approximately 60 million cases over the course of … A new look at the 2009 pandemic of H1N1 swine flu finds an unusual pattern — more people died in the Americas than in the rest of the world.
H1N1 was first detected in Mexico in 2009. For more information about this message, please visit this page: How do I view different file formats (PDF, DOC, PPT, MPEG) on this site? There are several reasons for this: These are some of the reasons that CDC and other public health agencies in the United States and other countries use statistical models to estimate the annual number of seasonal flu-related deaths. While EIP data is reported weekly during influenza season, because the system is based on reviews of patients medical charts there are sometimes delays in reporting and it can take some time for all the data to fill in. To receive weekly email updates about this site, enter your email address: Note: Javascript is disabled or is not supported by your browser.
The previous estimates of 2009 H1N1 cases, hospitalizations and deaths through November 14 encompassed the peak of 2009 H1N1 activity in the United States. Flu-associated mortality varies by season because flu seasons often fluctuate in length and severity.
While these numbers are an estimate, CDC feels that they present a fuller picture of the burden of 2009 H1N1 disease on the United States. There are several strains of flu virus, and it’s especially prone to mutation. CDC will continue to provide weekly reports of influenza activity each Friday in The estimated ranges of cases, hospitalizations and deaths generated by this method provide a sense of scale in terms of the burden of disease caused by 2009 H1N1. It was a new version of the flu virus, a very distant descendant of the H1N1 flu that caused the deadly 1918 pandemic.
More people who are hospitalized or die of flu-related causes are tested and reported, but under-reporting of hospitalizations and deaths occurs as well.
* Deaths have been rounded to the nearest ten. The latest estimates through December 12 show a modest increase in the total number of 2009 H1N1 cases, hospitalizations and deaths since the 2009 H1N1 virus emerged. CDC will continue to use weekly data from systems that comprise the CDC has developed a method to provide an estimated range of the total number of 2009 H1N1 cases, hospitalizations and deaths in the United States since April, 2009, as well as a breakdown of these estimates by age groups.
With seasonal influenza, about 60 percent of This methodology and the resulting estimates continue to underscore the substantial The estimates derived from this methodology provide the public, public health officials and policy makers a sense of the health impact of the 2009 H1N1 pandemic. This method uses data on influenza-associated hospitalizations collected through CDCâs Throughout the remainder of the 2009 H1N1 pandemic CDC will update the range of estimated 2009 H1N1 cases, hospitalizations and deaths every three or four weeks.
According to the CDC, 60.8 million cases of H1N1 were reported over a period of one year, from April 12, 2009, to April 10, 2010. No, says Simonsen — because most of the deaths in Mexico, for instance, came in the so-called third wave of the pandemic, months after it first started spreading and after it had gone around the world already.It may have to do with small differences in viruses that infected people in earlier years — maybe something slightly different was circulating in Europe, she says.The study is the latest to show that influenza can be baffling.