Since measles was declared eliminated in the US in 2000, the country's occasional cases have come mainly from international travelers—visitors from far-flung places where the virus still spreads freely—or unvaccinated US residents who return from abroad with a highly infectious souvenir. But as vaccination rates have slipped nationwide in recent years and outbreaks grow bigger and more frequent, domestic travel now poses a greater risk than international incursions.

In a study published this week in NEJM Evidence, Washington state health officials highlight that risk, detailing how an explosive outbreak in South Carolina reached their distant state through five distinct importation events over two weeks in January. In all, the introductions led to 26 cases among residents before officials stamped out the spread.

South Carolina's measles outbreak began on October 2, 2025, and was declared over on April 26, 2026. Officials confirmed 997 cases in the state during the outbreak. At the time, it was the largest measles outbreak recorded since the virus was declared eliminated, but Pennsylvania's ongoing outbreak has since surpassed it.

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At a recent meeting of the board that oversees the National Institutes of Health's Clinical Center Research Hospital, chair Jack Leslie opened with cheerful introductions and gregarious chatter—then diverted from the agenda of the regularly scheduled meeting. He spent the next six minutes delivering a pointed rebuke of Health Secretary Robert F. Kennedy, warning that his anti-vaccine activities could tarnish the venerable hospital, often called the "house of hope" for patients with rare conditions or those who have exhausted all other options.

Leslie took issue with a recent stunt Kennedy had pulled at the hospital, which involved making a surprise appearance for a ribbon-cutting ceremony to open his signature vaccine injury clinic. The ceremony included a panel with people claiming to have been injured by vaccines. They sat behind placards reading "vaccine injured" and spoke with Kennedy and other high-ranking Trump administration officials.

Leslie prefaced his comments by noting that some might prefer he not speak out against Kennedy's efforts. "But I think that that would be a failing as an advisory board if we were silent," he said. Leslie also noted that he has no concerns about studying potential injuries from vaccines. "Serious reactions are rare, but real," he said, and people who believe they've been injured should "be taken seriously."

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Personalized mRNA vaccines against melanoma—the deadliest form of skin cancer—reduced the risk of death or recurrence by 42 percent compared to standard treatment in a late-stage trial, pharmaceutical partners Merck and Moderna announced Thursday.

The results are a significant advance in melanoma treatment; Merck and Moderna are already engaging with regulatory authorities to get the vaccine approved. More broadly, the vaccine's success bolsters hope that mRNA vaccines and individualized cancer-targeting medicines offer a new paradigm for cancer therapies.

"From the beginning, we believed mRNA technology could make it possible to develop cancer treatments uniquely matched to each patient’s tumor," Moderna CEO Stéphane Bancel said in a statement. The trial results "mark a defining moment for that vision and show what’s possible when we rethink how medicines are made." They also "reinforce our conviction that mRNA has the potential to fundamentally change how we treat cancer," he said.

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Government officials in Guinea-Bissau have formally rejected a clinical trial that would be run by Danish researchers and funded by the US to look for alleged nonspecific harms from the newborn dose of the hepatitis B vaccine. The vaccine dose is currently recommended globally for all newborns and has been used safely and effectively for decades.

In an email to Ars Technica, one of the trial's lead researchers, Christine Stabell Benn of Bandim Health Project and the University of Southern Denmark, said that Guinea-Bissau's Council of Ministers "formally reaffirmed its non-acceptance of the study on 16 October."

The revelation that the study was formally rejected last week comes after news on Monday that judicial police in Guinea-Bissau raided Bandim Health's offices and seized vaccines. Stabell Benn highlighted that the police search came after the trial was rejected.

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Police in Guinea-Bissau raided the offices of Danish researchers on Monday, seizing doses of hepatitis B vaccine intended for a vaccine trial for newborns. International health experts have called the trial "unethical," but anti-vaccine Health Secretary Robert F. Kennedy Jr. has attempted to fund it with US taxpayer dollars.

Under Kennedy, the US Centers for Disease Control and Prevention announced in December that it had awarded the Danish researchers—led by married couple Peter Aaby and Christine Stabell Benn of Bandim Health Project—an unsolicited $1.6 million grant to run the trial. Aaby and Stabell Benn are controversial vaccine researchers who claim vaccines cause overlooked harms. They have been repeatedly praised by Kennedy but are currently under investigation by Danish authorities for alleged scientific misconduct.

Plans for the trial were halted in January as widespread condemnation erupted over the trial's design, which would potentially expose thousands of newborns in the country to hepatitis B, risking a lifelong infection that can lead to liver cirrhosis, cancer, and premature death. Outrage flared again after a Rolling Stone story earlier this month claimed the CDC set aside another $1.6 million in funding in late September and planned to move forward with the trial.

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