Measles outbreaks in West Texas and New Mexico are now up to more than 250 cases, and two unvaccinated people have died from measles-related causes.
Measles is caused by a highly contagious virus that’s airborne and spreads easily when an infected person breathes, sneezes or coughs. It is preventable through vaccines, and has been considered eliminated from the U.S. since 2000.
Here’s what you need to know about measles in the U.S.
How many measles cases are there in Texas and New Mexico?
Texas state health officials said Tuesday there were 25 new cases of measles since the end of last week, bringing Texas’ total to 223. Twenty-nine people in Texas are hospitalized.
New Mexico health officials announced Friday that there were 30 cases in Lea County, which neighbors the West Texas communities at the epicenter of the outbreak.
A school-age child died of measles in Texas last month, and New Mexico reported its first measles-related death in an adult last week.
Where else is measles showing up in the U.S.?
Measles cases have been reported in Alaska, California, Georgia, Kentucky, Maryland, New Jersey, New York, Pennsylvania and Rhode Island.
The U.S. Centers for Disease Control and Prevention defines an outbreak as three or more related cases — and there have been three clusters that qualified as outbreaks in 2025.
In the U.S., cases and outbreaks are generally traced to someone who caught the disease abroad. It can then spread, especially in communities with low vaccination rates.
Do you need an MMR booster?
The best way to avoid measles is to get the measles, mumps and rubella (MMR) vaccine. The first shot is recommended for children between 12 and 15 months old and the second between 4 and 6 years old.
People at high risk for infection who got the shots many years ago may want to consider getting a booster if they live in an area with an outbreak, said Scott Weaver with the Global Virus Network, an international coalition. Those may include family members living with someone who has measles or those especially vulnerable to respiratory diseases because of underlying medical conditions.
Adults with “presumptive evidence of immunity” generally don’t need measles shots now, the CDC said. Criteria include written documentation of adequate vaccination earlier in life, lab confirmation of past infection or being born before 1957, when most people were likely to be infected naturally.
A doctor can order a lab test called an MMR titer to check your levels of measles antibodies, but health experts don’t always recommend this route and insurance coverage can vary.
Getting another MMR shot is harmless if there are concerns about waning immunity, the CDC says.
People who have documentation of receiving a live measles vaccine in the 1960s don’t need to be revaccinated, but people who were immunized before 1968 with an ineffective measles vaccine made from “killed” virus should be revaccinated with at least one dose, the agency said. That also includes people who don’t know which type they got.
