Tennessee Senator Lamar Alexander put the pressure on parents to do what he calls the right kind of research when making decisions about vaccinating their kids.

He did so at a Senate hearing in response to the measles outbreak in the U.S.

"As with many topics, just because you found it on the internet doesn't mean that it's true," said Alexander.

The CDC reports measles cases are confirmed in 11 states so far this year.

Doctors said vaccines are the answer to this problem.

Immunization records in Tennessee are high.

According to the state health department, over 95 percent of kindergarten students were fully vaccinated before starting school in 2017.

But, thousands of kids in Tennessee remain unvaccinated for a variety of reasons.

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