The number of measles cases in the U.S. has risen to 884, according to new Centers for Disease Control and Prevention data published Friday. Here's what you need to know.

The measles outbreak in western Texas has now reached 624 cases, according to new data published Tuesday by the Texas Department of State Health Services.

Multiple states have reported their first cases of measles in the year to date.  

Louisiana, Virginia and Missouri all reported their first measles cases of 2025 this weekend.

More than 800 measles cases have been reported in the United States -- nearly triple the number in all of last year.

The CDC confirms that there are at least 800 confirmed cases nationwide across 24 states.

Seven cases of measles have been confirmed in Michigan so far this year, according to state health officials.

The measles outbreak in western Texas is continuing to grow, reaching 561 cases, according to new data published Tuesday.

The outbreak in the U.S. has risen to more than 700 cases, which is the most in six years, across at least 24 states.

Measles cases have been confirmed in at least 24 states, CDC data shows.

News’ Stephanie Ramos spoke with ABC News’ medical contributor Dr. Alok Patel about the growing number of measles cases, vaccines and President Trump’s physical exam.

The CDC has reported an increase of 105 cases since last week, with most infections found in people under age 19.

Robert F. Kennedy Jr. praised the measles response in Texas and the U.S., saying it's a "model for the rest of the world." But the comparison to Europe is an unfair one.

HHS Secretary Robert F. Kennedy Jr. said the curve is flattening in the measles outbreak in Texas. Public health experts say that's not what the data shows.

HHS Secretary Robert F. Kennedy Jr. said the curve is flattening in the measles outbreak in Texas. Public health experts say that's not what the data shows.

The measles outbreak in western Texas is continuing to grow with a total of 505 in the state, according to data published Tuesday.

Measles cases in the U.S. have more than doubled compared to last year, with the vast majority reported in west Texas.

Texas health officials reported the second measles death of a child – an otherwise unvaccinated healthy eight-year-old girl.

Texas Dr. Leila Myrick reacts to treating cases of measles in the state when it was something before the outbreak she had not learned much about during medical school.

A second child in Texas has died with measles, according to state health officials.

Dr. Peter Marks, a top former FDA vaccine official, joined ABC News Live to discuss the ongoing outbreak of measles following the death of a second child in Texas.

Measles cases are confirmed in at least 21 states, with 642 cases nationwide. Texas is facing the worst outbreak of measles in 30 years.

ABC's Mireya Villarreal reported on the alarming measles outbreak in Texas, which is nearing 500 cases and last week claimed the life of a second child -- an unvaccinated 8-year-old girl.

There are 607 confirmed measles cases across 21 states nationwide, according to data from the CDC.

The measles outbreak in western Texas has hit 481 cases as 59 newly identified infections were confirmed over the last three days, according to new data published Friday.

Seven young children at a day care center in Lubbock have been diagnosed with measles. One child was hospitalized.

The number of measles cases nationwide is climbing and doctors are urging the unvaccinated to get their shots.

ABC News medical contributor Dr. Alok Patel explains the new data published by the Texas Department of State Health Services.

The measles outbreak in western Texas is continuing to grow with a total of 422, according to new data published Tuesday.

When Texas officials first discovered measles cases this year, they were among the Mennonite population. Now, officials say cases are spreading to other communities.

ABC News’ Martha Raddatz interviews Biden’s coronavirus response coordinator and dean of Brown University's School of Public Health Dr. Ashish Jha on “This Week.”

Plus, why Utah banned fluoride in public drinking water and the potential fallout from the FDA’s top vaccine official’s resignation.

The number of measles cases associated with an outbreak in western Texas has grown to 400 cases amid reports of some children taking unhealthy amounts of vitamin A.

Texas is now reporting 400 measles cases with 41 people requiring hospitalization. The first cases in Texas were back in January.

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.

A measles case was confirmed in a person who traveled to Washington, D.C., on an Amtrak train, according to the D.C. Department of Health.

A measles case was confirmed in a person who traveled to Washington, D.C., on an Amtrak train, according to the D.C. Department of Health.

Health officials are working to inform fellow passengers.

State and local data shows that measles vaccination rates appear to be increasing in some areas of the U.S. that have been affected by outbreaks this year.

The measles outbreak in western Texas is continuing to grow with 327 cases confirmed, according to new data published Tuesday.

There are now more than 370 cases across the U.S. in 17 states, according to recent CDC data.

The state of Texas is now reporting 309 cases with one death, bringing the total of confirmed measles cases to 378 across 17 states.

The number of measles cases associated with an outbreak in western Texas has grown to 309, according to new data released Friday.

As measles cases continue to spread across the United States, experts reveal who may need another vaccine dose and who is protected from the virus.

The measles outbreak in western Texas has grown to a total of 279 cases, according to new state data published Tuesday.

Plus, why the FDA has recalled certain skincare products and a new report that children should avoid slushies.

The number of measles cases associated with an outbreak in western Texas has grown to 259, according to new data released Friday.

RFK Jr. has claimed measles can be treated with vitamin A and that severe infection is linked to poor diet. But many experts who spoke with ABC News disagreed.

Former CDC director Dr. Rochelle Walensky called for stronger, nationwide guidance on infant measles vaccine doses in a new opinion paper published Friday.

Europe saw the highest number of measles cases last year in more than 25 years, according to a new report published Thursday by the WHO and UNICEF.