The federal Centers for Disease Control and Prevention has just released its weekly update on influenza in the U.S. and an early look at the data shows the problem is spreading.
Thirty states now report high levels of influenza-like illness, the CDC says. That's six more than reported high levels last week. California joins the list of states reporting widespread flu activity, meaning 48 states now report widespread flu.
Hospitalizations of elderly people are rising, according to the report.