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The United States is facing its most severe measles outbreak in decades, with confirmed cases in 2025 already exceeding the highest totals recorded since the disease was declared eradicated in 2000. As of July 5, there are 1,277 confirmed measles cases across 39 states and jurisdictions, surpassing the previous peak of 1,274 cases in 2019.
The outbreak has led to at least 155 hospitalizations, affecting 431 adults and 824 children, and has resulted in three confirmed deaths so far. The majority of cases are linked to a major outbreak that began in west Texas, which continues to expand rapidly. Texas alone has reported 753 confirmed cases since January, including two fatalities among school-aged children in the most heavily impacted areas. New Mexico and Kansas have also reported high numbers of cases.
Measles is one of the most contagious infectious diseases known. According to the Centers for Disease Control and Prevention (CDC), 92% of unvaccinated people exposed to the virus will become infected, and about one in five of those infected will require hospitalization. The virus spreads through respiratory droplets and can linger in the air for up to two hours after an infected person has left the area.
The current surge in cases is closely linked to declining vaccination rates and increased non-medical exemptions, particularly in Texas. In some counties, exemption rates among K-12 students have reached as high as 13.6% for the 2023-2024 academic year. The CDC and health officials continue to stress the importance of the measles, mumps, and rubella (MMR) vaccine, which is highly effective at preventing infection.
Symptoms of measles typically appear seven to 14 days after exposure and include:
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High fever
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Cough
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Runny nose
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Watery, red eyes
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A rash that develops three to five days after initial symptoms
Additional signs can include severe cough, nasal congestion, loss of appetite, diarrhea, and the appearance of Koplik spots—small white lesions inside the mouth.
Health authorities urge the public to ensure vaccinations are up to date, especially for children and those traveling to affected areas. The CDC recommends discussing the MMR vaccine with healthcare providers to protect both individuals and the broader community, including those who cannot be vaccinated for medical reasons.
Disclaimer: This article is based on publicly available information as of July 6, 2025. The situation is evolving, and readers are advised to consult official health sources and their healthcare providers for the most current guidance and recommendations.
