Flu activity increased again last week, and though illnesses are at relatively low levels, all three strains are circulating, including plenty of influenza B, especially in the southern states, the US Centers for Disease Control and Prevention (CDC) said today in its weekly update.

Typically, most influenza B activity occurs toward the end of the flu season, but last season saw very little influenza B activity and was marked by two waves of influenza A, the first from 2009 H1N1 and the second from H3N2.

Maps show a few hot spots

Credit CDC

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See also:

Nov 8 CDC FluView report