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Pennsylvania Reports Over 1,300 Measles Cases in 2026

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Health Desk

In Short: Pennsylvania's health department has reported over 1,300 measles cases this year, with the outbreak continuing to spread.

Measles cases and deaths in the United States, OWID
Photo: Our World In Data / Wikimedia Commons (CC BY 4.0)

Pennsylvania's health department reported more than 1,300 measles cases this year, with the outbreak continuing to spread across 44 counties.

As of October 19, the state had recorded 1,286 measles cases, according to Ars Technica.

YouTube — Amesh Adalja MD YouTube

The outbreak, which began in late April, has led to five measles-associated deaths, with a sixth death reported recently by a local coroner.

The Pennsylvania Department of Health (DOH) said state health center staff have administered more than 6,500 measles, mumps, and rubella (MMR) vaccinations at pop-up clinics in affected communities.

The DOH added 78 new cases over the past seven days, bringing the total to 1,338 cases.

Of the confirmed cases, 17% have been in children under the age of 5, and 42% have been in kids and adolescents ages 5 to 19.

The outbreak has been concentrated in Lancaster County, which is known for its traditional Amish roots and open farmland.

The state health department said none of the victims was vaccinated, and Franklin County officials reported the 39-year-old had a previous measles diagnosis and 'several underlying conditions.'

The outbreak has also raised concerns about unreported infections in neighboring Chester County, where 93 cases have been reported this year.

Health officials are investigating a spike in cyclosporiasis, a parasitic illness nicknamed the 'explosive diarrhea parasite.'

The outbreak is the largest of multiple outbreaks across the US, happening amid an uproar over Health Secretary Robert F Kennedy Jr's controversial vaccine stance.

What this adds

The number of confirmed US measles cases has hit 4,588, more than doubling its total from last year.

Background

Pennsylvania is facing its worst measles outbreak in three decades, with the state health department reporting 1,260 cases as of Friday.

The number of measles cases in the United States has more than doubled this year, reaching 4,588 cases as of the latest CDC report, compared to 2,244 cases reported in 2025.

Measles-cases-and-death-rate
Photo: Our World In Data / Wikimedia Commons (CC BY 4.0)

What's confirmed

What's still developing

Sources