SAN ANTONIO – Several cases of the flu have already popped up in the emergency room at Christus-Santa Rosa's Alamo Heights campus.
Flu is definitely on the rise in San Antonio, and while it's not widespread yet, doctors say they are seeing some cases.
"It's not the full-blown season, but it's definitely on the upswing," said Dr. Joe Pendon, an emergency room physician at Christus-Santa Rosa's Alamo Heights campus.
Even if you had the flu shot, you may not be protected, doctors say.
The Centers for Disease Control and Prevention reports this year's vaccine may be less effective than usual, due to a mutated strain. However, Pendon said it can still help make a difference.
"We know that the vaccine has some effectiveness, even against some strains of flu that are a little bit different than was originally predicted, so it is your no. 1 best defense to get vaccinated," said Pendon.
Maintaining a healthy immune system can also help. Pendon said it's important to get good, quality sleep, eat a well-balanced diet, exercise, wash your hands often and stay hydrated.
If you do happen to get sick, head the doctor as soon as possible to get an antiviral medication, which can help speed up recovery.
Then, do your best to keep from spreading germs to others.
"Watch where you cough and stay home from work or school to avoid spreading the flu those that you're in close contact with," said Pendon.
Pendon said flu season typically peaks in December or January, but it can vary from year to year.
According to the CDC, five children have died from the flu this year.