Between October 1 and November 22, an antigenic difference in the circulating influenza A virus (H3N2) compared to the strain found in the current vaccine was identified. Known as antigenic "drift," this will potentially result in a more severe flu season, with the potential for higher morbidity and mortality.
The Centers for Disease Control and Prevention (CDC) is advising people who have not received the vaccine to get vaccinated as soon as possible because, despite that coverage for influenza A is diminished, the vaccine still provides protection against circulating influenza strains that have not undergone significant antigenic drift such as influenza A, H1N1 and influenza B viruses.
Forty-two counties in Florida reported increasing activity during week 48 of 2014, and besides increasing activity in pediatric patients, pregnant women are reporting higher numbers of cases than is typical for the start of the season.
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