US influenza activity has significantly increased over recent weeks, and health care providers should be vigilant about diagnosing and treating patients with the virus, according to a CDC Health Advisory issued recently.

According to the advisory, influenza A(H3N2) viruses have thus far predominated this season. Last year, vaccine effectiveness (VE) against circulating influenza A(H3N2) viruses was estimated to be 32% in the United States, and CDC officials expect that VE could be similar this season.

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