December 05, 2012
CDC: Early flu season is wake-up call for vaccination

Significant increases in flu activity in the United States have occurred in the last 2 weeks, indicating that an early flu season is upon us. These increases in activity overlap with National Influenza Vaccination Week (NIVW) being observed December 2-8, 2012. According to Dr. Melinda Wharton, Acting Director of CDC’s National Center for Immunization and Respiratory Diseases, “Increasing flu activity should be a wake-up call. For anyone who has put off vaccination: It’s time to get your flu vaccine now.”

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According to CDC’s weekly surveillance report published on November 30, 2012, 48 states and Puerto Rico have already reported cases of laboratory-confirmed influenza and, nationally, the percentage of specimens testing positive for influenza is rising fast. Influenza-like-illness (ILI) activity levels in parts of the country are already higher than all of last season. Nationally, 5 states are already reporting the highest level of activity possible.

According to FluView, activity is most intense in the south-central and southeast of the country right now; however, it shows signs of increasing across the rest of the country as well. Most of the viruses characterized so far this season have been H3N2 viruses; which are typically associated with more severe seasons. The good news is that most of the viruses characterized at CDC so far this season are well-matched to the vaccine viruses.

“How well the vaccine works depends in part on the match between vaccine viruses and circulating viruses,” Wharton explains. “If the influenza viruses spreading are very different from the vaccine viruses, the vaccine won’t work as well. While it’s early in the season, it’s encouraging to see a well-matched vaccine so far. That bodes well for how well this season’s vaccine will protect against illness, hospitalizations and deaths.”

More information about influenza and influenza vaccination is available on the CDC website at www.cdc.gov/flu. Links to state flu pages is available from BLR at Flu/Pandemic Prevention and Response Resources.


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