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.

With spiking cases and the first measles death in a decade, here are five things to know about measles.

Fifteen states, from Alaska to New York, are reporting cases of the measles, with Texas being the hardest-hit state with 223 cases reported.

The measles outbreak in western Texas is continuing to grow with a total of 223 cases confirmed, according to new data published Tuesday.

In West Texas, the measles outbreak is up to nearly 200 cases, leading officials to revise their vaccine recommendations in the hotspots.

Measles infections have been detected from Alaska to New York. There are now at least 198 cases linked to the outbreak in West Texas. Additionally, 30 cases have been reported in New Mexico.

The number of measles cases associated with an outbreak in western Texas has grown to 198, according to new data released Friday.

A possible second measles death has been recorded in the U.S. this year after a New Mexico resident tested positive for the virus following their death.

A possible second measles death has been recorded in the U.S. this year after a New Mexico resident tested positive for the virus following their death.

The state's surgeon general sent a letter to parents at Miami’s Palmetto Senior High School confirming a case at the school. Florida is now the 10th state to join a growing list with measles cases.

A Miami high schooler came down with measles, a doctor said Tuesday. It's the first known case of measles in Florida.

The number of measles cases associated with an outbreak in Texas has increased to 159 -- an increase of 13 cases in the past five days, authorities said on Tuesday.

The number of measles cases associated with an outbreak in Texas has increased to 159 -- an increase of 13 cases in the past five days, authorities said on Tuesday.

Measles is one of the most contagious viruses known to humans, experts say.

Dr. Paul Offit responds to Health and Human Services Secretary Robert F. Kennedy Jr., who stopped short of calling for vaccines amid the measles outbreak.

As measles spreads across the U.S. and an outbreak grows in western Texas, just how contagious is the virus?

As the number of measles cases continues to climb in some states, the first death happened from the disease in the U.S. in ten years.

The measles outbreak in Texas has grown to 146 cases with most infections reported among children and teenagers, according to new data released Friday.

ABC News chief medical correspondent Dr. Tara Narula breaks down what you need to know about the measles.

There is a growing concern among families and health officials as new measles cases are detected across the U.S.

With online searches about the disease soaring 900% in the last week, our chief medical correspondent Dr. Tara Narula answers some of the most common questions on the current outbreak.

With new measles cases reported from New Mexico to New Jersey, including a deadly outbreak in Texas, health officials are fighting to limit the spread of one of the world's most contagious viruses.

More measles cases have been confirmed in New Jersey and Kentucky as health officials work to treat patients in an ongoing outbreak in Texas.

Public health experts are questioning RFK Jr's comments after he said the Texas measles outbreak was "not unusual."

Dr. Lara Johnson, Chief Medical Officer at Covenant Health Hospital, joined ABC News Live to discuss the outbreak of measles in West Texas.

ABC News contributor Dr. John Brownstein discusses the return of the viral infection that was eliminated from the U.S. in 2000.

An unvaccinated school-aged child in Texas has died of measles in what the CDC says is the first fatality of the disease in the U.S. in a decade.

An unvaccinated school-aged child in Texas has died of measles, the first associated with an outbreak that has infected more than 100 people.

The child in the northwestern city of Lubbock was also the first person to die of the disease in the U.S. in a decade. As of Wednesday, 124 cases associated with the outbreak have been confirmed.