Northeast health leaders say CDC's shift on vaccines, autism was "inconsistent with decades of research" and may lead to "unnecessary fear and harm."

Hundreds of scientific studies have found no link between vaccines and autism. But some doctors say they're fielding more and more questions from parents on the topic.

The David J. Sencer CDC Museum, a Smithsonian affiliate located at agency headquarters in Atlanta, has been around for nearly 30 years. However, it's been closed since a shooter opened fire on the CDC in August, and there's no clear timeline as to when it will reopen.

More than 25,000 cases of whooping cough have been recorded in the U.S. so far this year, updated federal data shows.This marks the second year in a row with higher than usual cases, according to data from the Centers for Disease Control and Prevention (CDC).

"CDC’s recent statement regarding vaccines and autism is inconsistent with decades of research and more than 40 carefully designed and scientifically sound studies involving 5.6 million people that show no link or association between vaccines and autism," the collaborative said.

The state of Louisiana, under Abraham's leadership, failed to alert physicians and the public about two whooping cough deaths and the largest outbreak in the state in 35 years for months, despite medical professionals' attempts to raise the issue.