Flu is a tough bug says, Lynnette Brammer head of the Centers for Disease Control and Prevention's domestic influenza surveillance team. She says, "You're constantly chasing a moving target." She says we've had a wave of H1 activity and now we are seeing H3.

She says, "there's probably weeks and weeks of flu season to come." Vaccines are still the best way to prevent both strains of the flu. This year's vaccine is 62 percent effective against H1N1 and 44 percent effective against H3N2, according to the CDC.

While this year has been relatively mild we still have had about 22 thousand flu-related deaths.

The early signs of flu are often a sudden fever, aches or pains, weakness or a loss of appetite. In particular, having a cough and a fever together can be a good indication that you have flu.

The flu is treated primarily with rest and fluid to let the body fight the infection on its own. Over-the-counter anti-inflammatory pain relievers may help with symptoms.