WACO -- Doctor's say the whooping cough epidemic is the worst they've seen in 50 years.
So far, nine babies have died of pertussis and the Center for Disease Control and Prevention has had 18,000 confirmed cases this year.
That's double what it was last year.
Luckily in McLennan County there haven't been any more outbreaks since the end of school in June and no hospitalizations.
But the public health district is encouraging adults to get revaccinated.
"When you get the tetanus shot, the whooping cough is a component in that, so you are protected from tetanus, whooping cough and diphtheria," Kelly Craine with the McLennan County Public Health District said.
The CDC says at this rate we may pass the current record of 40,000 cases set back in 1959.