Some of the biggest hospitals in Texas have been overwhelmed with flu patients this winter. Doctors say it's not too late to get flu shot.

Houston Dr. Edward Rensimer says it's true this season's flu shot isn't as effective as other years, but it's better than nothing.

"30% is better than zero and it may save your life."

Dr. Rensimer says we owe it to one another to get a flu shot.

"I look at it as a social act and an act of caring about those people around you."

Dr. Rensimer says just because a flu test clears you that doesn't mean you're not sick.

"There are an awful lot of people being sent away with no treatment because the flu screen is negative and it's a big mistake. The time when Tamiflu is most effective is in the first one to three days of illness onset when you're sick; if you get beyond that you've kind of missed the boat."

Dr. Rensimer says get a flu shot and wash your hands frequently. If you have fever, aches and respiratory symptoms, see your doctor.

Walgreen's has Texas with nine of the top ten markets for flu activity.