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Pennsylvania's measles outbreak is the largest in decades in the US

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Cite

Stobbe, M. (2026, October 5). Pennsylvania's measles outbreak is the largest in decades in the US. Toronto Star. https://www.thestar.com/news/world/united-states/pennsylvania-s-measles-outbreak-is-the-largest-in-decades-in-the-us/article_6f47f838-960c-5bf3-8e5b-a56a280c442a.html

Dated when The Aporia collected the article, usually within hours of publication. Check the original for its exact date and byline.

Toronto Star · collected 2026-10-05 · by Mike Stobbe

Quick Summary

Pennsylvania has reported 1,004 measles cases this year as of Monday, marking its largest outbreak in over three decades; there have been 198 hospitalizations and five deaths linked to the disease. Nationwide, the U.S. is experiencing nearly 3,900 measles cases, which is the highest annual total since 1991. The outbreaks are largely attributed to declining vaccination rates, with some of the hardest-hit areas having significant Amish populations who tend to have lower vaccine coverage.
Written by AI on 2026-10-05, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

Pennsylvania is experiencing its largest measles outbreak in over three decades, surpassing 1,000 confirmed cases, including 198 hospitalizations and five deaths. The outbreak began in April and has primarily affected areas west of Philadelphia, with Lancaster County, home to significant Amish populations, recording the highest number at 391 cases. Health officials are concerned about low vaccination rates among these communities, which historically have lower uptake of MMR vaccines due to religious beliefs. With only seven out of 67 counties in Pennsylvania having their own health departments, coordinating a response has been challenging. The outbreak is drawing national attention and debates over public health policies, including criticism directed at U.S. Health Secretary Robert F. Kennedy Jr., who has previously raised concerns about vaccine safety.

Written for “Measles Outbreak Pennsylvania” on 2026-10-31, grounded in this article and the 3 other(s) covering the same event.

Story

📰 Measles Outbreak Pennsylvania
Health · 4 article(s) covering the same event. Compare every outlet's account →

Compared with similar articles

This article reads leans left and hedges 8% of its claims. Each row says how that neighbour differs.
The Guardian
Hedges 3 of 23 claims Outlet record 66/100
NBC News
Hedges 5 of 31 claims Outlet record 60/100
NBC News
Hedges 0 of 9 claims Outlet record 60/100
“The articles cover different aspects of the measles outbreak in Pennsylvania; one reports a specific death while the other discusses the overall scope and scale of the outbreak.”
The Guardian
⚖️ Leans left Hedges 3 of 40 claims Outlet record 66/100
The Hindu
Hedges 0 of 3 claims Outlet record 60/100
“While both articles discuss measles outbreaks in Pennsylvania and New York, they describe different aspects of the situation occurring at distinct times and places.”
The Guardian
Hedges 1 of 21 claims Outlet record 66/100
“Article A discusses Pennsylvania's outbreak, while Article B mentions a state of emergency declared in New York due to cases including those from neighboring states like Pennsylvania.”
The Independent
Hedges 2 of 18 claims Outlet record 59/100
“While both articles discuss the large measles outbreak in Pennsylvania and its impact, they describe different aspects of the situation: Article A focuses on the overall state statistics, while Article B highlights New York's declaration of a state of emergency due to the outbreak.”
CBS News
⚖️ Leans left Hedges 2 of 18 claims Outlet record 66/100
“While both articles discuss a large measles outbreak in the U.S., particularly mentioning Pennsylvania, they are reporting on different points in time and provide updates from separate dates.”
How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
24
sentences that state something as happening or true
Uncertain
8%
2 of 24 hedged ("reportedly", "may", "according to")
Leaning
Leans left
of the writing, not the subject · beta estimate
Publisher signals
64/100
Toronto Star's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
4
Health
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-10-05 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

Toronto Star · 10621 article(s) · 27 correction(s) detected
Running correction rate · 27 correction(s)
2026-10-26
Correction
2026-10-24
Correction
2026-10-07
Correction
2026-09-24
Correction

Who wrote this

Mike Stobbe
9 article(s) here · 1 carrying a prediction
🔮 Against the backdrop of the Trump administration’s shifting vaccine policy, Jennifer Shuford, deputy director of the Centers for Disease Control and Prevention, will leave her position after next week's midterm elections, the Washington Post said Monday, citing sources.
🔮 Some Americans with disabilities could be wrongly classified under plans to dramatically shrink the federal government's most influential health survey, advocates and researchers have warned.
🔮 In November, international health officials will meet to determine if the U.S. and Mexico have lost their measles-free status.
🔮 If they get infected with another type of dengue, the antibodies from the first infection may fail to neutralize the second type — and actually can help the virus enter immune cells and replicate.
🔮 Preteens may soon have something to celebrate: Medical experts are discussing the possibility that one dose of a life-saving cancer vaccine, instead of two, may be enough to protect them.
🔮 And public discussion of vaccine policy questions that might cross political divides — including whether there’s solid evidence to justify giving fewer shots to kids — has diminished.
🔮 They also have been checking properties for pooled water, including in tires, where mosquitoes might breed, said Paolo Pecora, senior environmental scientist for Hillsborough County Mosquito Management Services.
🔮 We've accomplished in 19 months things that would have seemed unthinkable two years ago,” he said.
Also by Mike Stobbe
Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 9 articles by Mike Stobbe →

Topics

CDC NEW YORK Ohio Pennsylvania U.S.

Subjects

Pennsylvania GPE · 6× U.S. GPE · 5× CDC ORG · 3× Ohio GPE · 2× NEW YORK GPE · 1× New York City GPE · 1× Philadelphia ORG · 1× South Carolina GPE · 1× Texas GPE · 1× Utah GPE · 1×

Narrative

The announcement quickly came under fire as a clash erupted between vaccine-promoting Democratic Gov. Josh Shapiro and U.S. Health Secretary Robert F. Kennedy Jr., a Trump administration appointee with a history of raising alarms about established vaccines.
framing: assertive · carried by 1 article(s) · first seen 2026-10-05
🔮 In November, international health officials will meet to determine if the U.S. and Mexico have lost their measles-free status.
2026-10-05 · Toronto Star
Pennsylvania's measles outbreak is the largest in decades in the US · assertive framing

Claims (24 extracted, 2 hedged)

Pennsylvania has surpassed 1,000 measles cases this year, state health officials said Monday, making it the largest state outbreak in more than three decades. asserted
it → surpass → decades
The U.S. is enduring its worst year for measles since 1991, with nearly 3,900 reported cases, according to the CDC. uncertain
U.S. → endure → CDC
The nation has seen eight reported measles-associated deaths in the past two years — more than the combined total of reported deaths over the previous three decades. asserted
nation → see → decades
Since the beginning of last year, large outbreaks have been reported in several states, including Texas and Utah, as well as South Carolina, which had the largest with 997 cases reported. asserted
cases → report → largest
Health officials say Pennsylvania’s current outbreak started in April, west of Philadelphia. asserted
outbreak → say → Philadelphia
There have been 1,004 cases, including 198 hospitalizations and five deaths, state officials said. asserted
officials → include → hospitalizations
Health experts attribute such outbreaks to low vaccination rates. asserted
experts → attribute → rates
It’s been decades since a U.S. state has seen an outbreak surpass 1,000 cases, stretching back to a multiyear outbreak in New York City in the early 1990s that infected more than 4,500 people. asserted
that → see → people
The nation eliminated the domestic spread of measles in 2000 by maintaining high vaccination rates, but those rates have fallen in recent years to below the 95% coverage needed to prevent outbreaks. asserted
rates → eliminate → outbreaks
In November, international health officials will meet to determine if the U.S. and Mexico have lost their measles-free status. asserted
U.S. → meet → status
It spreads when people who have it breathe, cough or sneeze, and through contaminated surfaces. asserted
who → spread → surfaces
It also can linger in the air for two hours. asserted
It → linger → hours
Up to 9 out of 10 people who are susceptible will get the virus if exposed, according to the Centers for Disease Control and Prevention. uncertain
who → get → Control
U.S. measles infections have been surging in recent years, as fewer kids get routine vaccines due to parental waivers, healthcare access issues and rampant disinformation. asserted
kids → surge → waivers
Pennsylvania is not the only state with a growing problem. asserted
Pennsylvania → grow → problem
Neighboring Ohio has reported more than 200 cases this year. asserted
Ohio → neighbor → cases
Like in Pennsylvania, some of the hardest-hit Ohio counties have significant Amish populations, which tend to have lower vaccination rates. asserted
which → hit → rates
Meanwhile, CDC officials have quietly begun to acknowledge measles-associated deaths in Pennsylvania. asserted
officials → begin → Pennsylvania
State officials in August announced that two unvaccinated residents died after being infected with measles. asserted
residents → announce → measles
The announcement quickly came under fire as a clash erupted between vaccine-promoting Democratic Gov. Josh Shapiro and U.S. Health Secretary Robert F. Kennedy Jr., a Trump administration appointee with a history of raising alarms about established vaccines. asserted
clash → come → vaccines
Since then, Pennsylvania has reported three additional deaths. asserted
Pennsylvania → report → deaths
But for weeks, the CDC — which Kennedy oversees — did not count any deaths on its measles data dashboard, instead saying it was seeking more information. asserted
it → oversee → information
That changed two weeks ago, when one death was finally counted, and again last week when a second was added to the agency’s tally. asserted
second → change → tally
The Associated Press’ health and science coverage receives financial support from the AP Fund for Journalism and private foundations. asserted
coverage → receive → Journalism
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