If you haven't had the whooping cough vaccine, now is the time to get it.
The Centers for Disease Control has declared the number of cases at an epidemic level.
Texas MedClinic says South Texas adults need to get the pertussis vaccination if they have children.
"The concern here and primary reason to vaccinate the adults though is because whooping cough can be deadly in kids," said Dr. David Gude at the Texas MedClinic. "Adults get ill, but don't tend to die. But young kids especially can die. In 2010 there were 25 deaths."
The CDC has seen about 16,000 cases so far this year. That's about as many as in all of 2011.