The CDC reports 4,410 measles cases in the US this year, an increase of 330 in a week, with Pennsylvania hit hardest. More than 5,900 MMR vaccine doses have been given at pop-up clinics as vaccination coverage among kindergarteners falls.
01Summary
- 01The CDC has recorded 4,410 measles cases in the US so far in 2026, up 330 from the previous week.
- 02There have been 451 measles-related hospitalisations nationwide; children aged 5–19 account for 42% of cases.
- 03Pennsylvania has 1,222 cases across 42 counties, 225 hospitalisations and five confirmed deaths, with a sixth under investigation.
- 04The CDC has sent a disease detective to Pennsylvania after the state requested federal assistance via an Epi-Aid.
- 05MMR vaccination coverage among US kindergarteners fell from 95.2% in 2019–2020 to 92.4% in 2025–2026, leaving about 280,000 at risk.
02Why it matters
The outbreak highlights falling childhood vaccination rates and poses a direct health risk to unvaccinated children and communities. Expanded state and federal efforts aim to prevent further spread and deaths.
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