(WHAS11) -- It's expected to be a 50-year record outbreak of an illness doctors say your children need to be protected from.
Doctors are concerned about whooping cough.
Nine babies in the United States have already died in 2012 from it. And increases in whooping cough or pertussis are reported in 37 states with the highest rates so far in Washington and Wisconsin.
The CDC is examining the vaccine now; a study recently found the newer vaccine was not as effective as the older one.
“If protection wears off even slightly faster, pertussis is really transmissible,” Doctor Tom Clark, with the CDC, said.
Babies can't get the vaccine until they are 2-months-old. The CDC encourages adults and young adults to get a booster dose and pregnant women as well.