A fourth person in Pennsylvania has died of measles, the state health department confirmed Tuesday. The latest death was in an unvaccinated 18-year-old resident of Mifflin County.

In the announcement, the state health department also confirmed a county coroner's report over the weekend of the death of an unvaccinated 40-year-old woman in Jefferson County. The state had previously reported two deaths in Lancaster County; both were infants—a newborn boy and a 6-week-old girl, both too young to be vaccinated.

According to the Mifflin County coroner, Andrea L. Alcalde, the 18-year-old's cause of death was determined to be acute disseminated encephalomyelitis (ADEM), which is a rare but known severe complication of measles. The condition is characterized by a rapidly progressing autoimmune disorder in which aberrant inflammation from an infection strips away the protective coverings of nerve cells in the brain and spinal cord. Before measles vaccines were widely used, ADEM was commonly associated with measles, though other viral infections can also spur its development.

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A 40-year-old woman in Jefferson County, Pennsylvania, has died of complications from measles, according to the county's coroner.

It marks the third vaccine-preventable, measles-linked death in the US this year. All three have occurred in Pennsylvania, which is experiencing an explosive outbreak that has caused over 670 cases and 124 hospitalizations across 37 counties. Prior to these deaths, Pennsylvania had not reported a measles death in 35 years.

In a news release dated September 12, Jefferson County Coroner Greg Furlong said the death of the woman was "a heartbreaking loss for the family and an unfortunate reminder that measles can be a serious and potentially life-threatening disease."

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For a child bursting with energy, few things are more fun than hurtling through a bouncy castle, launching into the air, and ping-ponging between every surface. But that childhood buoyancy will quickly deflate when it turns out those surfaces are smeared with a hypervirulent, multidrug-resistant pathogen.

That was the horrifying reality for a community in Ireland in fall 2025. Neighbors had gathered for an afternoon of merriment, complete with a barbecue, a sweets station, and three bouncy castles. Officials estimate that about 120 people joined the festivities, and around half of them were children and teens. Within a day, some children began developing signs of an infection. In all, 48 children in the community developed aggressive skin and soft-tissue infections.

Of the 48 cases, 33 were treated by their regular doctor, and 15 sought emergency care. Four children ended up being hospitalized. Luckily, all of the children recovered. The results of the outbreak investigation were reported this week in the journal Eurosurveillance.

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Having more than 150 non-human primates at a research center fall ill with diarrhea in a stomach-churning outbreak that flowed for over two years doesn't sound much like good fortune. But for some scientists, it kind of was, providing a heaping pile of valuable data on how they might finally defeat a foul foe.

In a study published in the latest issue of Science Translational Medicine, scientist sifted through the dump of immunological data from the infections, logging new ways to train immune cells to defeat the bacteria behind the outbreak, a type of Shigella. Researchers were able to pluck out specific bits of the bacteria that the immune system could most effectively attack, linking specific target molecules to specific types of germ-busting immune responses. The researchers even precisely homed in on some of the tiny notches within those craggy target molecules where the most potent antibodies attached.

In all, the study "revealed unexpected features of the anti-Shigella antibody response in naturally infected [non-human primates] and represents a step toward the rational design of Shigella vaccine candidates," the authors write.

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The Trump administration is halting vital federal research on the foodborne parasite Cyclospora, despite the record-breaking, nationwide outbreak of the diarrheal pathogen, according to Politico.

Of the three research programs that represent nearly all of the Cyclospora work at the US Department of Agriculture, two have been defunded, and the third is about to lose every scientist working on it. The Trump administration is shuttering the USDA's Beltsville Agricultural Research Center near Washington, DC, and moving its work to a location in Iowa. That includes relocating the remaining Cyclospora research.

Although the research is still funded, insiders told Politico that not one of the scientists working on the project plans to relocate from Maryland to Iowa. Instead, they are either retiring, being reassigned to a different project, or leaving the USDA's research services.

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Senators are renewing calls for anti-vaccine Health Secretary Robert F. Kennedy to step down or be ousted—and at least one is calling for a criminal investigation—amid the release of documents they say prove Kennedy lied to them during his confirmation hearings last year.

"This is a pattern, not a slip," Sen. Edward J. Markey (D-Mass.) said in a statement. "RFK Jr. has lied to the Senate, lied to the American people, and jeopardized the health of children to advance his anti-vaccine agenda."

Sen. Ron Wyden (D-Ore.) said in a social media post Friday that the documents were "Proof we got RFK lying on the record during his confirmation hearing (a crime)." He called for the matter to be referred to the US Department of Justice for a criminal investigation. In a separate statement to The Guardian, Wyden added that "RFK's platform is built on lies and grifts that leave a trail of dead children in their wake. There are consequences for lying to Congress."

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As Americans cook their vegetables to at least 158°F to kill a diarrheal parasite that has sickened over 24,000 people and killed two this summer, one US Senator is turning up the heat on Health Secretary Robert F. Kenney Jr. over the government's "calamitous response" to the record outbreak.

In a letter sent Thursday, Elizabeth Warren (D-Mass.) called the federal response to the Cyclospora outbreak "botched" and "marred by missteps." She pointedly questioned whether corruption and incompetence within the Trump administration and its clear ties to Taylor Farms—the mammoth produce distributer that sold Mexican-grown iceberg lettuce linked to the outbreak—played a role in the federal government's failures.

"[P]olitical contributions and direct White House lobbying from Taylor Farms... raise urgent questions about the role this influence-peddling may have played in loosening federal food safety oversight and hampering the federal government’s response to the outbreak," Warren wrote in the letter.

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Although shredded iceberg lettuce at Taco Bell restaurants has been a prime suspect in an explosive outbreak of the diarrheal parasite Cyclospora, a new report from the Food and Drug Administration finally reveals where all the contaminated lettuce was sold—and only a sliver of it went to Taco Bell locations.

The feces-tainted lettuce was sourced from Mexico and sold by Taylor Farms, a mammoth produce provider based in California. Taylor Farms has drawn scrutiny for its ties to the Trump administration and reluctance to provide information amid the outbreak, which has now sickened over 23,000 people across 47 states, killing two and sending over 500 others to the hospital. Taylor Farms reportedly attempted to delay issuing a recall amid the illnesses and, since then, has refused to clearly report how much tainted lettuce it recalled and where all of it had been shipped.

The FDA's Enforcement Report finally provides some answers: Taylor Farms recalled 236,192 cases of lettuce due to potential Cyclospora contamination. Of those, only 5,900—just shy of 2.5 percent—were sold to Yum, the parent company of Taco Bell, Pizza Hut, and KFC. The other 97.5 percent of the lettuce that potentially sickened Americans was distributed elsewhere.

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Up until recently, measles vaccination has been so effective that there’s been little medical or financial incentive to develop treatments for the disease.

But as measles cases hit a 35-year high and vaccination rates continue to decline in the US, a handful of biotech companies and academic groups have started working on measles treatments for those infected with the virus as well as vulnerable individuals needing short-term protection. It will likely be years, however, before these countermeasures are available, and it’s even more uncertain if those who refuse vaccines would take such treatments.

Fueled by large outbreaks in South Carolina and Utah, the US had already surpassed last year’s 2,289 measles cases, and it’s only July. For comparison, there were just 285 cases in all of 2024.

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The Food and Drug Administration announced on Wednesday that it's investigating yet another outbreak of Cyclospora, the unicellular foodborne parasite behind a nationwide surge in explosive watery diarrhea illnesses. The FDA said 72 cases have been identified in this outbreak, but the agency provided no details on the situation.

This announcement marks the sixth Cyclospora outbreak investigation the FDA has opened this year. Overall, the Centers for Disease Control and Prevention has gotten reports of more than 11,500 cases (including 4,173 confirmed and over 7,400 probable) from 41 states. Among the cases, there have been 308 hospitalizations and no deaths.

This year's tally so far—just in July—greatly exceeds the normal number of cases the US sees in a whole year. In recent years, the US has reported between 2,000 and 5,000 cases in a year, according to CDC data. With a new outbreak announced, the tally of cases is likely to continue climbing. Nevertheless, when asked about the national surge in cases earlier this week, anti-vaccine Health Secretary Robert F. Kennedy Jr. said the situation was "under control."

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Federal officials on Monday reaffirmed that iceberg lettuce from Taylor Farms still appears to be the source of Cyclospora, the microscopic parasite behind a multi-state surge in explosive diarrhea cases.

The assertion was intended to clear up confusion that began swirling over the weekend around a false positive test from the Food and Drug Administration—which Taylor Farms celebrated, sparking confusion. Still, many details of the outbreak remain murky, largely due to the vague recall information Taylor Farms has publicly provided.

On Friday, the FDA, along with the Centers for Disease Control and Prevention, announced that the FDA's traceback investigations for the outbreak converged on Taylor Farms. Traceback investigations work by tracking backward from sick people and the foods they ate to where those foods came from through the supply chain, down to individual farms or production facilities. When the FDA said their investigation converged on Taylor Farms, the agency means that, over and over again, tracebacks led them to shredded iceberg lettuce grown in Central Mexico and supplied by Taylor Farms—which also goes by Taylor Fresh Foods.

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Federal officials on Friday announced that shredded iceberg lettuce imported from Mexico and served at Taco Bell restaurants in five states is a source of Cyclospora, the foodborne parasite causing the nationwide surge in cases of explosive, watery diarrhea. The five states are Indiana, Kentucky, Michigan, Ohio, and West Virginia.

A traceback investigation by the Centers for Disease Control and Prevention and the Food and Drug Administration identified a single supplier in Mexico as the source of iceberg lettuce for Taco Bell restaurants where sick people reported eating. While federal authorities did not name the supplier, sources told the Washington Post that it is Taylor Farms.

Taylor Farms was also implicated in a 2024 multi-state E. coli outbreak linked to contaminated onions served at McDonald's and other fast-food restaurants. At the time, FDA inspectors found multiple violations at a Taylor Farms facility in Colorado.

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Lettuce and salad greens have become the prime suspects in an explosive outbreak of the diarrheal parasite Cyclospora, which is surging nationwide but erupting to extraordinary heights in Michigan.

In recent years, Michigan has typically reported around 50 cases of cyclosporiasis, which causes urgent bouts of watery diarrhea, abdominal cramps, and nausea. But, this year, as of July 14, the state has reported 3,309 cases of the food-borne pathogen. Of those 44 have been hospitalized.

Based on interviews with more than 1,000 people sickened in Michigan, the latest data is pointing to leafy greens as the source, according to the Michigan Department of Health and Human Services (MDHHS).

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A US citizen doing humanitarian work in the Democratic Republic of the Congo has tested positive for Ebola, marking the second American infected amid the DRC's explosive Ebola outbreak—and the second to be sent for care in Germany rather than the US.

The Ebola outbreak, which was first declared on May 15, is already the third largest on record and still growing. As of July 12, the DRC has reported 1,926 cases and 702 deaths in the outbreak, which is caused by the lesser-known Bundibugyo strain of Ebolavirus.

Under the Trump administration, the US has adopted a seemingly isolationist approach, implementing stringent and controversial travel restrictions and blocking the repatriation of citizens exposed to or infected with the virus. That's despite the US having multiple facilities around the country designed to safely monitor and provide high-quality care for Ebola patients in these types of situations.

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Cases of an explosive diarrheal parasite continue to skyrocket in Michigan, which is reporting 1,251 cases as of July 9. Of those, 44 were hospitalized. Meanwhile, across the border in Ohio, cases are also quickly rising, with news reports of a case total over 500.

The outbreak in Michigan began with two cases reported on June 22 and rose steeply at the start of July. The Michigan Department of Health and Human Services (MDHHS) reported 572 cases on July 4. On Wednesday, July 8, 239 cases were reported, the highest single-day tally so far. The current total of 1,251 cases includes 159 case reports received on July 9.

The epicenter of the outbreak is in the southeastern corner of the state, where health officials from multiple jurisdictions are working furiously to identify and interview cases to track the source, or sources, of the parasite, which spreads through food and water.

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Cases of a diarrhea-causing intestinal parasite have exploded in Michigan over the last two weeks in an outbreak that still has no clear source.

As of July 6, the state has received reports of over 700 cases since June 22, along with 36 hospitalizations, the Michigan Department of Health and Human Services (MDHSS) told Ars Technica on Tuesday.

On June 30, the health department reported 170 cases, which rose to 572 on July 4.

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Amid disease surveillance for the ongoing Ebola outbreak, Ugandan health authorities identified a case of Marburg virus disease in a one-and-a-half-year-old child, who has died, according to Africa Centers for Disease Control and Prevention. But Ugandan health officials appear reluctant to publicly disclose information about the case and its context.

Marburg virus is related to Ebolaviruses and causes similar hemorrhagic disease. Its transmission routes and prevention measures are likewise similar.

On Wednesday, Africa CDC told Reuters that no contacts of the deceased toddler had developed symptoms, and there were no other current active cases in the country, citing Ugandan health authorities. But when Reuters reached out to Uganda's health ministry, a spokesperson said he was not aware of a Marburg outbreak.

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