The number of states reporting widespread seasonal flu activity jumped from 10 to 25 last week, the Centers for Disease Control and Prevention said Friday.

Widespread activity was reported in Alabama, Alaska, Arkansas, Colorado, Connecticut, Georgia, Idaho, Illinois, Indiana, Kansas, Louisiana, Massachusetts, Minnesota, Missouri, Nebraska, Nevada, New York, North Carolina, Oklahoma, Oregon, Pennsylvania, Texas, Utah, Virginia, Washington state and Wyoming, according to the CDC’s weekly flu advisory report, covering the week ending December 28.

“Widespread” means that more than 50% of geographic regions in a state — counties, for example — are reporting flu activity. It addresses the spread of the flu, not its severity.

Two new pediatric flu deaths were reported to the CDC last week, according to the report. One was associated with the H1N1 virus; another was associated with an influenza A strain. Six pediatric flu deaths have been reported since September 29, according to the CDC.