CDC updated estimates of 2009 H1N1 influenza cases, hospitalizations and deaths in the United States from April 2009 – February 13, 2010:
– CDC estimates that between 42 million and 86 million cases of 2009 H1N1 occurred between April 2009 and February 13, 2010. The mid-level in this range is about 59 million people infected with 2009 H1N1.
– CDC estimates that between about 188,000 and 389,000 H1N1-related hospitalizations occurred between April 2009 and February 13, 2010. The mid-level in this range is about 265,000 2009 H1N1-related hospitalizations.
– CDC estimates that between about 8,520 and 17,620 2009 H1N1-related deaths occurred between April 2009 and February 13, 2010. The mid-level in this range is about 12,000 2009 H1N1-related deaths.
Note: Less than 5% of increases in the estimates from one reporting date to the next are the result of delayed reporting in cases, hospitalizations and deaths.
The release also noted that “…The latest estimates through February 13, 2010 show a relatively small increase in the total number of 2009 H1N1 cases, hospitalizations and deaths since the previous estimates posted on February 12, 2010. The additional four weeks of flu activity data added to derive these updated estimates correlate with a four week period of ongoing but generally low flu activity in the United States….
“…As of February 13, 2010, approximately 86 million people had received 97 million doses of 2009 H1N1 vaccine. When the numbers of people vaccinated against 2009 H1N1 is combined with the number of people previously infected with 2009 H1N1, a significant number of people in the United States likely have immunity to the 2009 H1N1 virus. However, with a population of more than 300 million in this country, a substantial number of people likely remain susceptible to 2009 H1N1, which continues to circulate at this time…”