updated 12/11/2009 12:41:39 PM ET 2009-12-11T17:41:39

Health officials say winter flu is just starting to show up in the U.S. while swine flu infections continue to wane.

Swine flu was widespread in only 14 states last week — mostly in the Northeast. That's down from 25 states the week before and 48 in late October. The Centers for Disease Control and Prevention released the new data Friday.

CDC officials said a shortage of swine flu vaccine is easing, with 85 million doses now available. About 98 percent of lab-confirmed influenza cases last week were swine flu, but the CDC also noted seasonal flu is increasing slightly.

The regular flu usually peaks in the winter.

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