Rep. Byron Donalds, a Republican from Florida who is running for governor, has blamed “rampant illegal immigration” during the Biden administration for measles outbreaks. But we found no link to illegal immigration in several recent large outbreaks, and infectious disease experts told us that the main driver of the cases is falling measles vaccination rates in the U.S.
Issues: measles
What We Know About Pennsylvania’s Two ‘Measles-Associated’ Deaths
After the Pennsylvania Department of Health announced two cases of measles-related deaths in one county, the local coroner appeared to contradict the account. And in an ongoing spat with Pennsylvania Gov. Josh Shapiro, Health and Human Services Secretary Robert F. Kennedy Jr. has alleged that a Shapiro staffer may have even “fabricated” the deaths. We’ll lay out what we know.
A Timeline of RFK Jr.’s Mixed Messaging on the Measles Vaccine
In defending his record on measles, Health and Human Services Secretary Robert F. Kennedy Jr. twice said during a recent Senate hearing, “We promote” the measles vaccine. While it’s true that the Centers for Disease Control and Prevention continues to recommend the shot, Kennedy has rarely made an unequivocal endorsement of it, even as the nation has seen an alarming rise in measles cases.
The Whoppers of 2025
Q&A on Changes to Recommendations for Combined MMR and Chickenpox Vaccine
On Sept. 18, the vaccine advisory committee for the Centers for Disease Control and Prevention voted to change its recommendation on the combined vaccine for chickenpox and measles, mumps and rubella, called the MMRV vaccine. We spoke to experts about claims made at the meeting as well as the implications of the vote.
No Sign of Texas Measles Outbreak Slowing, Contrary to RFK Jr.’s Claims
Posts Make Unsupported Claims About Origin of Texas Measles Outbreak
The measles vaccine uses a weakened virus that’s never been shown to spread to others. Samples from the outbreak in Texas also show that a wild-type virus is responsible. Yet, social media posts have falsely claimed that the outbreak is due to a vaccine strain. Without evidence, other posts have blamed immigrants crossing the southern border illegally.
RFK Jr. Misleads About Measles Vaccine in Hannity Interview
In an interview with Fox News’ Sean Hannity, Health and Human Services Secretary Robert F. Kennedy Jr. made several unsupported or misleading claims about the measles vaccine, which the Centers for Disease Control and Prevention has said is safe and “the most important tool to prevent” the disease. Meanwhile, a measles outbreak in Texas continues to expand.
Measles Is Harmful, Contrary to Flimsy Social Media Claims of Long-Term Benefits
Measles is an extremely contagious vaccine-preventable disease that can lead to death or disability. It also wipes out immune memory for several years after an infection. As an outbreak in Texas continues to expand, social media posts have claimed without sufficient support that measles infections are beneficial later in life against cancer and other diseases, an idea health secretary Robert F. Kennedy Jr. has echoed.









