A bizarre series of events in a college microbiology lab class left 33 people—including students, professors, and lab workers—believing they were exposed to a deadly germ. Of those, 32 began taking an antibiotic regimen as a precaution to prevent a life-threatening infection. Two also underwent lumbar punctures—aka spinal taps—after developing mild symptoms.

But none of them had actually been exposed to a dangerous pathogen, a fortunate twist in the strange incident, which otherwise stands to be a cautionary tale for the ages. The incident was published in a recent issue of Morbidity and Mortality Weekly Report.

It began with a simple laboratory exercise. The microbiology lab students were supposed to be given mystery bacteria by their instructors and then identify the microbe based on a series of biochemical tests and morphological characterization.

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Ardent anti-vaccine activist and current US Health Secretary Robert F. Kennedy Jr. is reportedly on thin ice with Trump for not being anti-vaccine enough for the president's liking, according to a report late Monday from The Wall Street Journal.

Trump has become fixated on the completely false, thoroughly debunked claim that vaccines cause autism, the Journal reported. People familiar with the president's scattered thinking say Trump wants an autism remedy to be part of his legacy and thinks scaling back childhood vaccinations is a way to secure that achievement. As such, he has grown frustrated and disappointed that Kennedy hasn't done more to cut back federal childhood vaccine recommendations or confirm a link to the neurodevelopmental disorder.

In May, the president reportedly aired his disappointment, calling out Kennedy for having "the yips" that were preventing him from acting on his zealous anti-vaccine agenda while holding the highest health position in the country. In June, Trump reportedly vented in the Oval Office to Kennedy that he wasn't doing enough.

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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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Anti-vaccine Health Secretary Robert F. Kennedy Jr. has made it one of his top priorities to convince Americans to "eat real food," including more fresh fruits and vegetables. But, it's a hard sell when those real foods are causing real eruptions of explosive diarrhea across the country.

The Food and Drug Administration is investigating six outbreaks of foodborne diarrheal illnesses caused by Cyclospora, a unicellular parasite known for spreading from human feces onto fresh produce. Past outbreaks have been linked to leafy greens, fresh basil, fresh cilantro, snow peas, green onions, and raspberries. The Centers for Disease Control and Prevention has tallied a record high of over 11,500 confirmed and probable cases across 41 states, with over 300 requiring hospitalization. And that case total is almost certainly an undercount.

The largest of the outbreaks is linked to Taylor Farms' iceberg lettuce that was sold at Taco Bell restaurants and many other companies. The outbreak has sickened thousands of people across nine states, up from five states identified last week. One of the affected states is Michigan, which alone has reported 9,253 cases as of July 27. The other five outbreaks have no identified source.

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As long as there have been vaccines, there have been people who doubted their science and safety.

Back in 19th-century England, people rioted against a mandatory smallpox vaccine, claiming that it violated civil rights and was an affront to human bodily integrity. In the United States, organizations dedicated to resisting vaccines have existed since the Anti-Compulsory Vaccination League of Brooklyn was established in 1894.

Researchers generally refer to people who do not follow the standard advice of health professionals about vaccines, by either refusing or delaying some or all vaccines, as vaccine hesitant. Today, vaccine hesitancy is most famously associated with the Make America Healthy Again movement and its standard-bearer, Health and Human Services Secretary Robert F. Kennedy Jr.

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In a widely expected move, a committee organized by the Food and Drug Administration (FDA) has voted to endorse removing restrictions on the manufacture of peptides for human use. Thursday's panel meeting saw a sharply divided group recommend lifting limits on four peptides; votes on three additional peptides are scheduled for today. The move comes despite a continuing lack of evidence regarding their safety and effectiveness.

The move had been telegraphed months earlier as peptide enthusiast and Health and Human Services Secretary Robert F. Kennedy Jr. took steps to ensure this outcome.

Like proteins, peptides are composed of amino acids that are chemically linked into a chain. Peptides differ merely by length; they're often 10–20 amino acids long, in contrast to proteins, which can be hundreds or thousands. Some of them, such as insulin, are specifically made by targeted processing of a protein into shorter fragments, and the resulting peptide interacts with receptors that have evolved to send signals to cells based on its levels.

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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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A 63-year-old woman arrived at a hospital in pain. She had abruptly lost vision in her right eye. As doctors got to work, the series of findings that followed revealed not just bad news for her, but an alarming revelation of how infections can evolve within a patient.

The woman's remarkable case was reported this week in the New England Journal of Medicine. According to her doctors, initial magnetic resonance imaging scans of her brain quickly identified the key problem. The imaging indicated inflammation in her right eye, but also picked up lesions in her brain. Specifically, the imaging suggested problems in her parietal lobe, which is a hub for processing sensory information.

The doctors suspected she had a brain abscess. Laboratory results of her blood and urine samples suggested an infection as well as kidney problems. Doctors decided to open up her skull for a brain biopsy. Inside, the surgical team was met with pus. Meanwhile, doctors worked to identify the bacteria found in two urine samples.

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One of Rhode Island's most-wanted fugitives was arrested in New York last week after being on the run for more than 20 years, which was at least partially spent hiding as a biotech executive, according to Stat News.

In a Securities and Exchange Commission filing Monday, California-based Immix Biopharma noted that Richard Graydon was terminated Friday for "reasons unrelated to his activities at the Company."

It turns out, Richard Graydon was an alias for Ronald Fischer, a 70-year-old former anesthesiologist licensed in Rhode Island and Massachusetts, who fled amid his 2005 trial for first-degree sexual assault. Fischer was accused of raping a woman during a date on his yacht, Lion King.

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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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With summer heat comes pool parties, beach days, backyard cookouts, and, of course, swarms of bloodthirsty mosquitoes.

But while insect bites have always been a side effect of time spent outdoors, the species doing the biting are changing in historically temperate regions like New England. As climate change makes these areas warmer and wetter, their ranges are expanding—and any diseases they carry come with them.

In Connecticut, for example, a statewide mosquito monitoring program has detected 54 different species, including invasives like the Asian tiger mosquito, which can transmit potentially serious diseases including dengue and Zika. The mosquito’s historical territory is in hot and humid climates farther south, but it has been moving north.

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If you’re like me, you or a loved one has struggled through the process of gaining pre-approval for the medical care that your physician has recommended. Personal stories abound regarding the tribulations of patients as they go through hoops to get their health insurer to pay for certain prescription medications, medical procedures, and more.

When used judiciously, this process—known as prior authorization—serves as a check on overuse and spending on services or technologies for which there are less costly alternatives. But a large majority of physicians voice concerns about care delays, which can cause patients to abandon recommended treatments while waiting for the insurance company to verify their eligibility and confirm that the treatment is, indeed, medically necessary. Patients who are denied care may submit an appeal, but that requires more time.

AI might be able to help. With its ability to efficiently sort through vast reams of information, artificial intelligence could theoretically expedite approval of unambiguously allowable claims, thereby reducing care delays. However, AI-driven prior authorization is facing resistance, as it may increase wrongful denials of health insurance coverage. A 2025 American Medical Association survey of physicians revealed significant concern about the application of AI tools, with 61 percent of doctors worrying that AI will exacerbate denials of what they deem are necessary treatments.

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On Wednesday, Defense Secretary Pete Hegseth made the startling announcement that the US military would begin requiring all active duty and reserve personnel aged 30 and older to undergo mandatory screening for testosterone deficiency. The screenings will take place during yearly health assessments. Those under age 30 can also get screened on request.

In a short video posted on social media, Hegseth explained to the military community that the screenings and possible subsequent treatments are intended to "optimize your performance, your resilience, and your long-term health." While saying that the initiative wasn't about "artificial enhancement" and that members could decline treatment, Hegseth claimed that the testing and potential treatment was for "restoring and optimizing" capabilities, protecting "longevity," and "ensuring you have the biological foundation required to sustain the fight."

But will testosterone screening and treatment actually "optimize" our "warfighters"? Will it help most of them live longer? Should everyone else get screened and treated, too?

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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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Two nominees for high-profile health roles in the Trump administration faced scrutiny from the Senate health committee Wednesday—and both crashed and burned in their own special ways.

The Senate Committee on Health, Education, Labor, and Pensions (HELP) scrutinized Erica Schwartz, the nominee for director of the Centers for Disease Control and Prevention, and Sean Kaufman, up for the role of assistant secretary for preparedness and response.

Schwartz's assignment

Public health experts were "cautiously optimistic" about Schwartz's nomination. She is well-respected and holds views in line with evidence-based medicine, including being supportive of vaccinations—in contrast to anti-vaccine Health Secretary Robert F. Kennedy Jr., whom she will serve under. She is also highly qualified for the role, with a medical degree, a master's degree in public health, and a law degree. She's had a long career as a Navy Officer and previously held the roles of chief medical officer for the US Coast Guard and deputy surgeon general in the first Trump administration.

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The Trump administration on Monday barred US citizens in the Democratic Republic of the Congo from returning home amid an Ebola outbreak that continues to outpace response efforts.

Reuters first reported late Monday that Americans currently in the DRC or those who have recently traveled to the Ebola-stricken country have been put on a "do-not-board" list. They cannot travel back to the US until they have spent 21 days in a third country. The order, taken under a transportation authority known as Title 49, was independently confirmed by Politico on Tuesday.

Both outlets noted that roughly two dozen Americans who had been set to board flights home on Tuesday have already been blocked by the new rule. It remains unclear if the bar also applies to government workers. The Centers for Disease Control and Prevention has at least two dozen employees working in the DRC.

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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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Baby boomers are the generation cutting back most on alcohol consumption, outstripping Gen Z’s abstinence, as moderation takes hold at every level of society.

Seventy-one percent of boomers, those born between 1946 and 1964, consumed alcohol in the past six months—the lowest drinking rate of any generation and down 2 percentage points from three years ago, according to IWSR, a market researcher for the global beverage industry.

By contrast, 74 percent of Gen Z who are at the legal drinking age reported drinking in the past six months, up from 66 percent three years ago, as young people in their late teens and 20s catch up with the total adult population drinking rate of 76 percent.

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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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With no new data or clear reasoning, a panel of advisors hand-selected by anti-vaccine Health Secretary Robert F. Kennedy Jr. voted last September to strip federal recommendations for a combination shot against measles, mumps, rubella, and varicella (chickenpox). An analysis published today by independent researchers does the work the advisors neglected to do before the vote and, in turn, shows how harmful the decision is to vulnerable US toddlers.

The decision last fall followed clumsy discussion by Kennedy's dubiously qualified advisors, who make up the Advisory Committee on Immunization Practices (ACIP) for the Centers for Disease Control and Prevention. Most noticeably, their unprompted review of the MMRV vaccine did not include a standard decision-making framework ACIP has historically used to comprehensively evaluate what the change would mean for US children in practice—including basic questions, such as which children would be affected.

Still, the decision meant that private health insurance providers would no longer be required to cover the vaccine, called MMRV. It also meant the shot would no longer be available through a federal program that provides vaccines to about half of American children, mostly from low-income families.

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