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HealthQuiet 14d · day 21

Pennsylvania measles outbreak tops 600 cases; first breakthrough infections in vaccinated residents

The outbreak that began with two Lancaster County deaths has grown past 620 cases across 37 counties, with regulators now confirming rare infections in vaccinated people.

newest coverage 13d agosummary written 13d ago11 pieces NewswiresGoogle NewsMastodon

What to know

  • Pennsylvania's measles outbreak has grown from roughly 393 cases in late August to 624 by September 10, spreading to 37 of the state's 67 counties.
  • The outbreak includes the state's first measles deaths in 35 years, two unvaccinated Lancaster County residents, described in later reporting as two related children.
  • HHS Secretary Kennedy directed the CDC to omit the Pennsylvania deaths from its national tracker, prompting a public dispute with Gov. Shapiro over how the deaths are being characterized.
  • Health officials have now confirmed the outbreak's first breakthrough cases in vaccinated residents — four cases, described as mild and under 1% of the total.

“available information does not establish whether measles caused or contributed to the deaths or whether the individuals died from other causes while infected with measles”

CDC, national outbreak tracker note · Philadelphia Inquirer ↗ · Sep 3

Josh ShapiroJosh Shapiro Governor of PennsylvaniaRobert F. Kennedy Jr.Robert F. Kennedy Jr. U.S. Secretary of Health and Human ServicesErica SchwartzErica Schwartz CDC DirectorBrian C. Castrucci Epidemiologist, president/CEO of de Beaumont FoundationPennsylvania Department of Health State health agency tracking the outbreak

Pennsylvania measles outbreak tops 600 cases; first breakthrough infections in vaccinated residents
Philadelphia Inquirer

How it unfolded 3 developments, newest first · click a bar or a number to jump articlesposts

Peak 2 pieces in 5h at Sep 10, 7 AM; 11 pieces over 21 days (10 articles · 1 post) Sep 4, 4 PM — 1 piece · 1 article — Newswires 1Sep 4, 9 PM — quietSep 5, 2 AM — quietSep 5, 7 AM — quietSep 5, 12 PM — 1 piece · 1 article — Google News 1Sep 5, 5 PM — quietSep 5, 10 PM — quietSep 6, 3 AM — quietSep 6, 8 AM — quietSep 6, 1 PM — quietSep 6, 6 PM — quietSep 6, 11 PM — quietSep 7, 4 AM — quietSep 7, 9 AM — quietSep 7, 2 PM — quietSep 7, 7 PM — quietSep 8, 12 AM — quietSep 8, 5 AM — quietSep 8, 10 AM — quietSep 8, 3 PM — quietSep 8, 8 PM — quietSep 9, 1 AM — 1 piece · 1 article — Google News 1Sep 9, 6 AM — quietSep 9, 11 AM — 1 piece · 1 article — Newswires 1Sep 9, 4 PM — quietSep 9, 9 PM — quietSep 10, 2 AM — quietSep 10, 7 AM — 2 pieces · 2 articles — Google News 2Sep 10, 12 PM — 1 piece · 1 post — Mastodon 1Sep 10, 5 PM — quietSep 10, 10 PM — quietSep 11, 3 AM — quietSep 11, 8 AM — 2 pieces · 2 articles — Google News 2Sep 11, 1 PM — 2 pieces · 2 articles — Newswires 2Sep 11, 6 PM — quietSep 11, 11 PM — quietSep 12, 4 AM — quietSep 12, 9 AM — quietSep 12, 2 PM — quietSep 12, 7 PM — quietSep 13, 12 AM — quietSep 13, 5 AM — quietSep 13, 10 AM — quietSep 13, 3 PM — quietSep 13, 8 PM — quietSep 14, 1 AM — quietSep 14, 6 AM — quietSep 14, 11 AM — quietSep 14, 4 PM — quietSep 14, 9 PM — quietSep 15, 2 AM — quietSep 15, 7 AM — quietSep 15, 12 PM — quietSep 15, 5 PM — quietSep 15, 10 PM — quietSep 16, 3 AM — quietSep 16, 8 AM — quietSep 16, 1 PM — quietSep 16, 6 PM — quietSep 16, 11 PM — quietSep 17, 4 AM — quietSep 17, 9 AM — quietSep 17, 2 PM — quietSep 17, 7 PM — quietSep 18, 12 AM — quietSep 18, 5 AM — quietSep 18, 10 AM — quietSep 18, 3 PM — quietSep 18, 8 PM — quietSep 19, 1 AM — quietSep 19, 6 AM — quietSep 19, 11 AM — quietSep 19, 4 PM — quietSep 19, 9 PM — quietSep 20, 2 AM — quietSep 20, 7 AM — quietSep 20, 12 PM — quietSep 20, 5 PM — quietSep 20, 10 PM — quietSep 21, 3 AM — quietSep 21, 8 AM — quietSep 21, 1 PM — quietSep 21, 6 PM — quietSep 21, 11 PM — quietSep 22, 4 AM — quietSep 22, 9 AM — quietSep 22, 2 PM — quietSep 22, 7 PM — quietSep 23, 12 AM — quietSep 23, 5 AM — quietSep 23, 10 AM — quietSep 23, 3 PM — quietSep 23, 8 PM — quietYesterday, 1 AM — quietYesterday, 6 AM — quietYesterday, 11 AM — quietYesterday, 4 PM — quietYesterday, 9 PM — quietToday, 2 AM — quietToday, 7 AM — quiet 123
Sep 5Sep 7Sep 9Sep 11Sep 13Sep 15Sep 17Sep 19Sep 21now · 11:58 AM ET
  1. 3

    State reports first breakthrough measles cases in vaccinated residents

    Pennsylvania confirmed 52 new cases, including four in people who had been vaccinated — the first such breakthrough infections in the outbreak. Officials said these cases, which make up less than 1% of the total, have been mild.

    1. 2 outlets 52 new measles cases in Pennsylvania, 4 among vaccinated individuals

      first by ABC27, 14d ago · also PennLive

      1 more headline

    2. 2 outlets first by Inquirer.com, 14d ago · also Philadelphia Inquirer · read ↗

    1 more claim →
  2. 2

    Case count climbs to 624

    State figures showed the outbreak had grown to 624 confirmed cases, continuing the rapid rise seen over the preceding days.

    1. 2 outlets Pennsylvania surpasses 600 measles cases

      first by ABC27, 15d ago · also 6abc Philadelphia

      1 more headline

    • Pennsylvania has recorded its first measles-associated deaths in 35 years as U.S. cases reach their highest level since 1991 and childhood vaccination coverage continues to fall.

      the_intellectualist_official@threads.netMastodon14d agoview on Mastodon ↗
  3. 1

    Outbreak surges past 590 and then 600 confirmed cases

    Pennsylvania's case count crossed 590 and then topped 600, with cases now reported in 37 of the state's 67 counties; officials also reported two related children's deaths tied to the outbreak.

    “Every data point is a broken family, a mother crying, a future that's lost. Instead of grieving that and making sure it never happens again, you're debating the mechanism of death.”
    — Brian C. Castrucci, Epidemiologist, de Beaumont Foundation · source
    1. 1 outlet Pa. breaks another measles milestone as cases top 600

      first by PennLive, 15d ago

    2. 1 outlet first by Audacy, 16d ago · read ↗

  4. background

    CDC omits Pennsylvania deaths from its national tracker amid Kennedy-Shapiro clash — HHS Secretary Robert F. Kennedy Jr. asked CDC director Erica Schwartz to leave the two Pennsylvania deaths out of the agency's weekly outbreak update, marking them with an asterisk instead. Shapiro accused Kennedy of spreading vaccine misinformation, while Kennedy suggested the state had fabricated the deaths.

  5. background

    Shapiro announces Pennsylvania's first measles deaths in 35 years — Two unvaccinated residents of Lancaster County died of measles-associated causes, the state's first such deaths in 35 years and the first measles-related deaths reported in the U.S. in 2026. Gov. Josh Shapiro announced the deaths at a news conference in Lancaster County.