As measles spreads across the U.S., a few fully vaccinated people have contracted rare breakthrough cases. Here's what to know and why vaccination is still important.

Discover the 5 devastating long-term effects of measles beyond the rash, including immune system damage that leaves you vulnerable to other diseases for years.

The U.S. has seen more than 500 measles cases and two deaths since the start of the year, but few people say they are very concerned about the virus.

As a measles outbreak spreads across the United States, doctors are now seeing a new and unexpected danger: children getting sick from taking too much vitamin A.

Measles, declared eliminated from the US in 2000, saw significant outbreaks in 2018, 2019, and has re-emerged in 2025 with over 453 cases across several states. Texas reported over 400 cases. Vaccination remains 93-97% effective at preventing measles.

Measles vaccination rates for young children may be as low as 71% in younger children, well below the threshold needed for herd immunity.

State health officials worry that declining vaccination rates have left many communities vulnerable nationwide.

Kennedy made a show of shipping vitamin A to measles-stricken communities. The state’s public-health department didn’t take up the offer.

An out-of-state visitor with measles could have exposed others at a Mercer County medical center last week, the state Health Department announced Friday. The patient visited the emergency department at Capital Health Medical Center in Hopewell from 5:15 p.m. on March 22 to 1:30 a.m. the following morning, according to the state announcement.