The United States’ measles outbreak keeps growing. The Centers for Disease Control and Prevention (CDC) reported Friday that 4,588 measles cases have been recorded nationwide as of October 22 — up 178 from the week before — in what is already the largest US outbreak in decades.
Earlier this month, the CDC also confirmed a third measles-related death in 2026, after the National Center for Health Statistics verified that measles was listed as the underlying cause on a death certificate.
The numbers at a glance
- 4,588 confirmed measles cases nationwide as of October 22 (up 178 week over week).
- 479 measles-related hospitalizations this year, per CDC data.
- 3 deaths confirmed by the CDC in 2026 (two were reported in September).
- Children and teens aged 5 to 19 make up the largest share of cases — 1,914, or 42% — followed by adults 20 and older at 41%.
Pennsylvania is the epicenter
Pennsylvania remains the hardest-hit state, with about 1,338 cases reported as of October 23 and more than 250 hospitalizations, according to the state health department. The outbreak has spread well beyond its initial epicenter in Lancaster County, with more than 40 counties now reporting cases.
The state health department has reported five measles-related deaths in 2026 — a higher count than the CDC’s confirmed tally of three. The difference comes down to methodology: under Health Secretary Robert F. Kennedy Jr., the CDC now tracks measles deaths through National Center for Health Statistics mortality data rather than state health department reports, and it has said its count could change as reviews are completed. The CDC has not disclosed which states the three confirmed deaths occurred in.
Last week, the CDC said it would deploy additional support to Pennsylvania to help investigate the outbreak after the state formally requested federal help through the agency’s Epi-Aid emergency response program.
Other states seeing outbreaks
Wisconsin has now surpassed 300 cases tied to outbreaks across eight counties — the fourth-highest state total, behind Pennsylvania, South Carolina and Utah. In Chippewa County, the case count more than doubled in the past week alone.
Health experts point to one basic reason: slipping measles vaccination coverage. Measles is one of the most contagious viruses known, but the measles, mumps and rubella (MMR) vaccine is about 97% effective after two doses.
Elimination status at risk
The US was granted measles “elimination” status in 2000 — meaning the disease did not circulate continuously within the country. A World Health Organization commission is expected to vote on whether the country keeps that status at a meeting in November in Washington, D.C. Losing it would be a major public-health milestone in the wrong direction.
Know the symptoms
Measles symptoms typically start one to two weeks after infection: high fever, cough, runny nose, and red, watery eyes. A few days later, red spots or bumps appear on the face and near the hairline, then spread to the rest of the body; tiny white spots may appear inside the mouth.
If you think you or a family member may have measles, avoid others and call a doctor’s office or clinic before showing up, so the facility can take precautions to protect other patients.
Sources: CDC via Reuters (Oct 23, 2026), The Straits Times, Al Jazeera, Milwaukee Journal Sentinel.
This article reports public-health news and is for general information only — it is not medical advice. For personal health decisions, talk to your doctor or local health department.
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