Measles Surges as Vaccine Misinformation Spreads Online
WHO:
The Guardian - Crunchy Moms founder Sara Rupe said she created the Facebook group to share recommendations for personal-care products and makeup. She said, “I don’t censor things,” and that members could express themselves within Facebook’s community standards.
The Guardian - Renée DiResta, a Georgetown University professor who studies online manipulation, called Crunchy Moms “the most dangerous group on Facebook.” Meta did not comment on that characterization.
The Guardian - Pediatrician Dr Alok Patel said that telling parents not to vaccinate, give newborns vitamin K, or see a doctor—while promoting products—was “outright misinformation and potentially dangerous.”
The Guardian - Meta, Facebook’s parent company, said its health-misinformation policy and enforcement had not changed since 2023. It said it removes misinformation likely to contribute directly to imminent physical harm.
ABC News - The CDC reported 5,182 confirmed U.S. measles cases, including 18 among international visitors. Eight measles-associated deaths were confirmed: six in Pennsylvania, one in New York and one in Wisconsin. The CDC had confirmed four deaths and said the total was “subject to change.”
WHAT:
Al Jazeera - The CDC reported 5,182 confirmed U.S. measles cases, the highest total since 1991 and more than double the 2,289 cases reported in 2025.
Al Jazeera - Of the confirmed cases, 4,993 were outbreak-associated; children under five accounted for 18%, ages five to 19 for 41%, and children and teenagers together for about 59%.
Al Jazeera - Pennsylvania’s Department of Health reported six deaths and 1,487 measles cases. The CDC’s national tally listed four deaths; the agency said it was working with the U.S. Council of State and Territorial Epidemiologists on a standardized definition for measles deaths.
The Guardian - Crunchy Moms was created in March 2025. Administrators and moderators included founder Sara Rupe, her husband, a registered nurse; a pastor and his wife; and a person whose Meta-verified account described her as a doctor of holistic health.
The Guardian - Rupe said she believed her child’s autism was connected to vaccination. She also said she uses multiple accounts to help run the group, and that Facebook took down about one group post per month.
The Guardian - The network of groups associated with Crunchy Moms shared links to products, including supplements, an administrator’s skincare line, and affiliate products. Rupe’s daughter’s account was used to post a listing of more than three dozen products, including herbal remedy bundles costing over $100, $25 tallow balm, and red-light therapy panels costing $200 or more.
The Guardian - The Guardian reported that Meta’s AI titled one post “What vaccines are recommended or skipped during pregnancy and infancy?” and summarized comments as saying hepatitis B and flu vaccines were commonly suggested to skip. Meta said it had eliminated AI discussion summaries in September, but the Guardian captured more than 10 summaries in October.
The Guardian - The Guardian reported the entire Crunchy Moms group to Facebook on 1 October. Facebook did not send the journalist confirmations for any of the reports, and nearly all reported material remained available when Meta was contacted.
The Guardian - Facebook invited the Guardian journalist to join its community notes program, which replaced third-party fact-checking in the United States after the 2025 policy changes.
The Guardian - Crunchy Moms had more than 490,000 members, had more than doubled in size since January, and received hundreds of posts and thousands of comments and replies daily. It was the largest group in a network with more than 1 million members.
The Guardian - A Guardian test reported 55 group posts, comments and replies, plus one video, that appeared to violate Meta’s health-misinformation rules. Facebook did not acknowledge the reports; nearly all reported content remained available when Meta was contacted.
The Guardian - The group included claims that vaccines cause autism or SIDS, that measles is not deadly, and that black salve treats cancer. Meta’s policy lists several such claims as prohibited.
The Guardian - Meta’s AI summarized 589 responses to a parent’s measles-outbreak post, saying commenters “claim the vaccine is unnecessary or even harmful.” The Guardian said those claims were false.
ABC News - About 96% of U.S. cases were among unvaccinated people or people with unknown vaccination status; 2% involved people with one MMR dose and 2% with two doses. A plurality of cases was among people aged 5–19; at least 11% resulted in hospitalization.
ABC News - One MMR dose is 93% effective against measles and two doses are 97% effective, according to the CDC.
WHERE:
The Guardian - Group administrators and moderators included people in Connecticut and upstate New York; one moderator’s account identified her as living in Idaho. Members who encountered the group in Facebook feeds included an anesthesiologist in Sioux Falls, South Dakota, and a Minneapolis mother.
The Guardian - The outbreak discussed in the Facebook post was in Lancaster County, Pennsylvania.
ABC News - Confirmed cases were reported in 45 states and Washington, D.C.
WHEN:
ABC News - During the 2025–26 school year, 92.4% of kindergartners received MMR vaccination, compared with 95.2% during the 2019–20 school year.
WHY:
Al Jazeera - Pennsylvania’s measles-death reporting counts deaths of people with confirmed measles within 30 days of symptom onset unless the death resulted from an unrelated event. In August, the CDC removed two Pennsylvania deaths from its tally after Robert F. Kennedy Jr. questioned whether measles caused or contributed to them.
The Guardian - Health experts warned that online vaccine misinformation could undermine science-based care and put children at risk. Jennifer Allen and colleagues estimated that exposure to vaccine-skeptical Facebook content during the COVID-19 pandemic reduced vaccination intentions; without it, 5 million more Americans might have been vaccinated, saving approximately 21,000 lives.
HOW:
The Guardian - Facebook reports must be filed under the broad category “scam, fraud or false information,” followed by “Sharing false information”; the platform offers no specific reporting category for harmful health misinformation.
The Guardian - Facebook recommendations accounted for 36%–39% of users’ news-feed content, while content from friends accounted for about 20%. Several people told the Guardian Crunchy Moms appeared in their feeds despite not seeking it out.
ABC News - The CDC recommends two MMR doses: the first at 12–15 months and the second at 4–6 years, before school entry.
(UPDATED November 7, 2026 06:59 UTC)
U.S. measles cases have topped 5,100, the highest since 1991, with eight deaths. A large Facebook group shared vaccine misinformation experts say endangers children. Meta says its health-misinformation policy remains unchanged.
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(UPDATED November 7, 2026 04:00 UTC)
A huge Facebook parenting group shared vaccine misinformation, and nearly all reported posts remained online. Health experts warn these claims could endanger children. The CDC reports more than 5,000 measles cases and eight associated deaths.
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(UPDATED November 6, 2026 19:05 UTC)
A Facebook group with more than 490,000 members spread vaccine misinformation experts called dangerous. The CDC confirmed thousands of measles cases nationwide, including eight associated deaths. Most cases involved unvaccinated people or those with unknown vaccination status.