Measles Tracker

What is measles? 

• Measles is a highly-contagious respiratory virus that infects as many as 90 percent of non-immune people exposed to its pathogens, which can exist in the air for up to two hours after exposure. 

How bad is it?

• One in five unvaccinated people who contract measles require hospitalization. 

• One in 1000 people develop encephalitis, or brain swelling, which can cause convulsions and permanent brain damage. 

• As many as one in twenty children who get measles also contract pneumonia, which is also the most common cause of death from measles for young children. 

• One to three of every 1000 children who contract measles die from complications stemming from the infection. 

• Measles also has potential (though rare) longterm consequences, including risk of a deadly progressive form of encephalitis known as subacute sclerosing panencephalitis (SSPE). SSPE only occurs in about two of every 100,000 measles cases, but is an incurable neurological disorder that can begin showing symptoms six to eight years post measles infection and initial recovery. 

Who is most vulnerable? 

• According to the World Health Organization, “Any non-immune person (not vaccinated or vaccinated but did not develop immunity) can become infected. Unvaccinated young children and pregnant persons are at highest risk of severe measles complications.” 

What’s the solution?

• The measles vaccine has been approved in the United States since 1963, with an updated version of the vaccine achieved in 1968. The vaccine is a two-dose course with one shot administered between the ages of 12 to 15 months and the second usually administered between ages four and six. The first shot is about 93 percent effective, and the second is about 97 percent effective. Due to a highly successful measles vaccination program, and the safety & efficacy of the vaccine itself, measles was declared “eliminated” in the United States in 2000. 

What’s going on right now? 

• The measles vaccine, though safe, proven, and effective, requires a 95 percent vaccination rate to achieve “herd immunity” against the disease. Unfortunately, only eleven U.S. states achieved herd immunity-level vaccination rates amongst Kindergarteners for the 2023-2024 school year, rendering school-aged populations extremely vulnerable to the disease across the country.

• As of April 25, 2025, there are at least 884 confirmed measles cases across twenty-nine U.S. states. Three people have died related to the outbreak including two school-aged children in Texas and an adult in New Mexico. All were unvaccinated for measles, and are the first measles-related deaths in the United States in more than a decade. 

Where have measles cases been confirmed in 2025? 

As of April 25, 2025, confirmed measles cases (broken down by state) are as follows: 

State:	TX	NM	AK	AR	CA	CO	FL	GA	IN	HI	IL	KA	KY	LA	MI	MN	MO	MT	NJ	NY	OH	OK	PA	RI	TN	MD	WA	VA	VT
Cases:	646	66	1	3	10	5	11	3	8	2	1	37	2	2	9	2	1	5	3	4	30	15	13	1	6	3	5	1	1

Texas

• The epicenter of the 2025 measles outbreak continues to be West Texas, where 646 cases have been identified so far this year, and sixty-four people have been hospitalized from the outbreak. The Texas outbreak is the worst measles outbreak in thirty years. One unvaccinated school-aged child died from the outbreak in Texas in February, and another school-aged child died from a measles-related illness in April. 

New Mexico 

• New Mexico is experiencing a significant outbreak on its shared border with West Texas. As of April 25, 2025, New Mexico has documented sixty-six cases, one of which was fatal, in the state and has warned that “additional cases are likely to occur in Lea County and the surrounding communities.” 

Alaska

• Alaska had one confirmed case of measles in January 2025 of an unvaccinated adult. 

Arkansas

• Three cases of measles were identified in Arkansas as of April 25. These are the state’s first documented measles cases since 2018. 

California

• California has confirmed nine cases of measles, including in Los Angeles County. Three cases were reported by the state in February and five cases were reported in March.  

Colorado

• Colorado reported its first confirmed measles case of the year on March 31, 2025, in Pueblo and that number has since grown to at least five confirmed cases in Pueblo, Denver, and Archuleta County, Colorado. 

Florida 

• Florida has had at least eleven cases in 2025. That includes nine cases in Broward County in February, and an additional case in Polk County the same month. There are additional reports of another case as of March 5, 2025 in Miami-Dade county. 

Georgia 

• Three cases of measles have been reported in metro-Atlanta involving unvaccinated members of the same family. One case was reported in January, with the additional two reported by the state in February.

Indiana

• Indiana has reported an outbreak of at least eight cases as of April 25.  

Hawaii

• Hawaii reported its first case of measles of the year in an unvaccinated infant, and confirmed an additional case in the child’s parent on April 17. 

Kansas

• Measles cases in Kansas have continued to grow, with the state reporting 37 cases and one hospitalization as of April 18, 2025.

Kentucky 

• Kentucky confirmed one measles case in the state in February, and another in April.   

Louisiana

• Louisiana has now confirmed two measles cases as of April 22, 2025.

Michigan

• Michigan confirmed the state’s first measles case since July 2024, in February 2025, and the state now is reporting a total of eight confirmed cases since February. 

Minnesota 

• Minnesota confirmed its first measles case in late March, 2025. The individual flew during their contagious period to Washington, D.C., and traveled via Amtrak while there. A second confirmed case in the state was reported in April 2025.

Missouri

• Missouri confirmed its first measles case of the year in April 2025.

Montana

• In April, Montana had a significant outbreak of five confirmed measles cases reported and confirmed in Gallatin County. 

New Jersey 

• New Jersey has reported three confirmed measles cases in the state from February 14 – February 20, 2025. 

New York 

• There have been four confirmed cases of measles reported in New York in 2025. Two cases were reported in February in New York City, and two additional cases have been reported in March in New York State. 

Ohio

• Ohio confirmed its first case of measles since July 2024 in March 2025, and the state’s outbreak has increased to at least 30 confirmed cases in the state since the start of the year. 

Pennsylvania

• There have been thirteen reported cases of measles in Pennsylvania in 2025. 

Oklahoma

• Oklahoma has reported fifteen cases of measles as of April 2025, twelve have been confirmed and three of the cases remain probable. Most of the cases can be traced back to the measles outbreak in Texas and New Mexico, the state reports. 

Rhode Island 

• There has been one confirmed case of measles in Rhode Island, which occurred in January of 2025. It is Rhode Island’s first confirmed measles case since 2013. 

Tennessee

• Tennessee has confirmed six cases of measles in the state this year, including three as of April 1, 2025. 

Maryland

• There have been three confirmed cases of measles in Maryland in March 2025. 

Washington 

• There have been five confirmed cases of measles in Washington state since February 2025. 

Virginia

• Virginia reported its first measles case of 2025 in April. 

Vermont 

•  There has been one confirmed case of measles in Vermont in March 2025. 

Has the Trump Administration responded?

• RFK Jr., the Trump Administration’s Secretary of the Department of Health and Human Services, has responded to the crisis by pushing the benefits of “good nutrition,” Vitamin A, steroids, and cod liver oil. This response is idiotic, and has been heavily criticized by doctors and the American Pediatrics Association, for refusing to state plainly that the “best defense” against measles is vaccination. This is unsurprising given that RFK is a prolific and notorious vaccine skeptic whose disinformation campaigns related to the measles vaccine are partially responsible for the catastrophic and deadly rise of measles in Samoa in 2019. 

• As the measles epidemic continues to worsen, some doctors are seeing measles patients made more ill, and subsequent treatments made more complicated, by the use of Vitamin A as an unproven (but RFK Jr. backed) measles treatment alternative. As the New York Times reported on March 25, some patients are being given such high doses of the vitamin that they are showing signs of liver damage.

• In March, the Trump Administration also canceled billions of dollars in grants to state-level health agencies, including funds earmarked to support states in “tracking infectious diseases, [providing] mental health services, [and administering] addiction treatment and other urgent health issues.” The move is likely to severely impede the ability of already-struggling state level public health infrastructure and personnel to adequately address the worsening measles epidemic, as well as that of the slate of other crucial public health issues these institutions are relied upon by the public to address.