The Centers for Disease Control reports that nearly 30 states are reporting high flu-like activity, up from 16 the week before.
Health experts say a flu outbreak has already hit the South and the East and is now heading toward the Western U.S.
So far, more than 2200 people have been hospitalized with flu-like symptoms across the country this flu season. Eighteen children have died from influenza.
We spoke to Dr. Arleen Rockoff, infectious disease specialist at Kaiser-Permanente in Woodland Hills. She says your best protection against the flu is a flu shot.