Situation Update

Flu Activity: According to the final FluView for the 2009-2010 influenza season (May 16–22, 2010), flu activity in the United States declined again from the previous week and is about the same as what is normally seen during the summer in the United States. Only a small number of influenza viruses are being reported, most of which are 2009 H1N1. Flu is unpredictable, but sporadic cases of flu, caused by either 2009 H1N1 or seasonal flu viruses, will likely continue to occur throughout the summer in the United States. Internationally, 2009 H1N1 viruses are still circulating, including in the Southern Hemisphere, which is entering its flu season. For more information, please see the international situation update.
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Vaccination: CDC recommends influenza vaccination as the first and most important step in protecting against the flu. However, the 2010-11 seasonal vaccine is not available usually until September or later.  Because sporadic cases of 2009 H1N1 continue to be detected in the United States and 2009 H1N1 viruses are being reported in other parts of the world, CDC continues to encourage vaccination with available doses of monovalent 2009 H1N1 vaccine until the seasonal influenza vaccine becomes available.  Getting vaccinated against 2009 H1N1 at this time might be especially important for:

1. Children 6 months through 8 years of age who have not yet received a 2009 H1N1 vaccine. Getting a dose of 2009 H1N1 vaccine now means that these children will only need one dose of seasonal vaccine when it becomes available.
2. People who are traveling to areas where 2009 H1N1 is occurring, and
3. People who are at higher risk of flu-related complications, but have not yet received a 2009 H1N1 vaccine. This includes people with lung disease, like asthma or chronic obstructive pulmonary disease (COPD), diabetes, heart, or neurologic disease, and women who are pregnant.

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