The state is experiencing the nation’s worst ongoing measles outbreak, the first in the U.S. to top more than 1,000 cases since 1991.

A second measles case is now confirmed in Allegheny County as the outbreak continues to spread across Pennsylvania.

ACHD confirmed the two cases within the county are connected because both people went to the same school.

ACHD confirmed the two cases within the county are connected because both people went to the same school.

The Chester County Health Department is notifying residents of a possible measles exposure that took place at the following locations on Sunday, October 4, 2026:CVS 870 Baltimore Pike, Kennett Square

The Allegheny County Health Department (ACHD) was informed of a second resident who tested positive for measles.

A second Allegheny County resident tested positive for measles.

There were 86 cases of measles reported in Chester County as of Oct. 7.

A child at a North Hills private school is Allegheny County's second measles case this month. The school's vaccination rate is just 81 percent.

Three decades later, physicians who treated children in 1991 can hardly believe that Pennsylvania is again contending with the nation’s worst measles outbreak.

Oxford Area High School will be closed Friday, Oct. 9, after a confirmed case of measles within the school community.

A second Allegheny County child has measles. The student attends a private religious school where the reported vaccination rate is 81%.

States said the cash infusion will help bolster efforts to increase vaccinations and identify cases.

Susquehanna Valley student tests positive for measles

With about 1,000 cases and five deaths in Pennsylvania's outbreak, a Mifflin County clinic serving Plain families is relying on years of trust, steady vaccine advice and risk-planned home visits to pr...

View Mary S. Stoltzfus's obituary, find service dates, and sign the guestbook.

View Katie L. Lapp's obituary, find service dates, and sign the guestbook.

View Mary S. Stoltzfus's obituary, find service dates, and sign the guestbook.

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View Katie L. Lapp's obituary, find service dates, and sign the guestbook.

The Allegheny County Health Department has identified an Allegheny County resident who has tested positive for measles. The individual, an unvaccinated minor under 18 years old, is recovering at home....

An Allegheny County resident has tested positive for measles, with potential exposure reported at a Target store, health officials said.

For weeks, Pennsylvania has led the nation in the number of measles cases this year, with hundreds of people sickened in more than half the counties in...

The largest previous measles outbreak in the United States took place in Philadelphia in 1991 and infected 1,400 people.