Flu activity remains high across the nation, and there’s a second wave of severe infections striking some states. There were as many as 26.3 million flu illnesses, 12.4 million medical visits and 347,000 flu hospitalizations between October 1 and March 2, according to the weekly flu report released Friday by the US Centers for Disease Control and Prevention. The H1N1 virus strain has dominated this season, but H3 viruses have been circulating in the Southeast. Everyone 6 months or older should get vaccinated against the flu, the CDC advises. People over 65, children under 2 and individuals with medical conditions should also get a pneumococcal vaccination to prevent pneumonia.

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