Science
The Vaccine Skeptic in Trump’s New C.D.C. Leadership Team
When President Trump named a new leadership team at the Centers for Disease Control and Prevention two weeks ago, public attention focused on Dr. Erica Schwartz, his nominee to be the agency’s director. Her public support of vaccines was interpreted by some as a sign that Health Secretary Robert F. Kennedy Jr.’s quest to limit childhood immunizations might be coming to an end.
But another senior official Mr. Trump named to the team shares many of Mr. Kennedy’s views, suggesting the potential for continuing tension at the public health agency.
Mr. Trump appointed Dr. Sara Brenner, a deputy commissioner at the Food and Drug Administration and a self-described “MAHA mom,” to be Mr. Kennedy’s senior counselor for public health, a post that, unlike the C.D.C. director, does not require Senate confirmation. A look at Dr. Brenner’s background suggests she is aligned with Mr. Kennedy on some of his signature issues, including skepticism about vaccines and a strong belief in the importance of fitness.
The public health counselor serves as the liaison between the health secretary and the C.D.C. (and on occasion the White House). As such, Dr. Brenner, who starts the job in the next couple of weeks, will be Mr. Kennedy’s eyes and ears at an agency he has been warring with through most of his tenure as the nation’s top health official.
She will be based in Washington in the office of the secretary, and will most likely meet with the top officials at the C.D.C. at least once every day. She will also be Mr. Kennedy’s liaison to the National Institutes of Health, an agency that has come under fire for making large cuts to medical research grants.
Dr. Nirav Shah, who was the C.D.C.’s principal deputy director from March 2023 through February 2025, said Dr. Brenner could wield a powerful influence on the nation’s public health policies through her role. (Dr. Shah, a Democrat, is currently running for governor in Maine.)
He cited the work of previous officials who held that role and acted as “a conduit and a sounding board for agencies to help them get where they wanted to go.”
“If Sara follows that lead,” he added, “then there’s a possibility that it will be constructive. But if she rather asserts herself as a stand-in for the secretary or the director, then what we will see is more political interference.”
The Department of Health and Human Services would not make Dr. Brenner available for an interview.
“Dr. Brenner was selected for this role because of her experience as a physician and her work on federal public health policy,” Andrew Nixon, a spokesman for the department, said in an emailed statement.
“She brings a strong understanding of both clinical care and research and will work with Secretary Kennedy to optimize coordination with the C.D.C. and N.I.H.,” he added.
At a Make America Healthy Again event last May, Dr. Brenner said she had been pregnant during the pandemic and chose not to receive the Covid vaccine because she was concerned about the vaccine’s “biodistribution patterns.”
She co-wrote a memo saying there was “no clear evidence” that the benefits of Covid vaccines for children under 18 outweighed the risk of harm. She also intervened in the F.D.A.’s review of Novavax’s Covid vaccine, asking for more data on the shot at the 11th hour — a highly unusual step for the agency’s deputy commissioner.
Sarah Despres, who served as the public health counselor during the Biden administration, would not comment on Dr. Brenner specifically. But she said a person in that role would receive enough notice of new initiatives and scientific reports, including in the agency’s flagship journal, for her or the secretary’s office to block them.
“If you’re interested in interfering, you will have a heads-up,” Ms. Despres said.
Dr. Brenner, who holds degrees in medicine and public health, is currently a principal deputy commissioner at the F.D.A. In interviews, four former senior officials who worked closely with her described her as ambitious and eager to please her bosses, even if that meant going against the interests of the F.D.A.’s rank-and-file employees. (They asked to remain anonymous because of fear of retaliation from the administration.)
Two former colleagues recalled Dr. Brenner saying that people should not reflexively believe in vaccines but should insist on facts as they do for other medical products — echoing comments made by Mr. Kennedy and others who question vaccines. Dr. Brenner seemed unaware of the large body of evidence on vaccine safety that already exists, the colleagues said.
Asked about Dr. Brenner’s views on vaccines, Mr. Nixon said, “Anonymous characterizations don’t reflect her record.”
Aaron Siri, a lawyer who for years joined with Mr. Kennedy to bring lawsuits over vaccine safety, said he believed Dr. Brenner would “at least critically consider concerns” from people with opposing views.
“Wherever she comes out at the end, at least you feel like the data and evidence were given a more objective overall review,” he said.
Dr. Brenner joined the F.D.A. in 2019 as a midlevel scientist in the agency’s Center for Devices and Radiological Health. Shortly after Mr. Trump’s inauguration, in January 2025, she was catapulted to the position of acting commissioner, a job she held until April when his nominee for the job, Dr. Martin Makary, became the agency’s leader.
Before her ascent, some top officials were unfamiliar with her. Dr. Janet Woodcock, who worked at the agency for decades and was its principal deputy commissioner from 2022 to 2024, said she had “never even heard her name.”
Dr. Robert Califf, who led the F.D.A. during parts of the Obama and Biden administrations, said Dr. Brenner “was part of some briefings and seemed very professional,” but he did not know her well enough to comment on her work.
Dr. Brenner may have come to the attention of Mr. Trump’s team when she worked at the White House Office of Science and Technology Policy during his first term. After being named acting commissioner, she fully embraced the MAHA movement, signing her introductory emails to the F.D.A. staff with the slogan.
She was the agency’s leader while widespread layoffs were decimating the ranks of staff scientists. In her communications with staff members, she amplified the messages of the administration and did not address the distress of the employees, the former colleagues said. At the same time, she made it clear that she did not want to be in the office five days a week and sometimes showed up to meetings in workout clothes, the colleagues said.
In a video posted by the F.D.A. to social media as a “spin on the Pete and Bobby challenge” — referring to fitness videos made by Defense Secretary Pete Hegseth and Mr. Kennedy — she knocks out 50 burpees, 50 forearm to full planks and 100 bicycle situps in seven minutes and one second.
Sounding much like Mr. Kennedy, she says, “I’ve been encouraging people my whole career to understand that taking care of their body is one of the most important things that you can do on a daily basis.”
Mr. Nixon, the health department spokesman, said that “Dr. Brenner exemplifies what it means to be a MAHA mom through her commitment to improving children’s health and well-being through nutrition and fitness.”
The other three officials Mr. Trump named to lead the C.D.C. have all been enthusiastically received by public health experts.
Dr. Schwartz, the White House’s nominee to be the agency’s director, has degrees in medicine and public health and has praised vaccines, prompting cautious optimism that she will steady the C.D.C. It is unclear when she might be confirmed by Senate. The White House has not yet filed papers to move her nomination forward.
The agency has been without an official director since Mr. Kennedy fired Susan Monarez after a dispute over vaccine policy 29 days after she began the job. The agency has also experienced widespread layoffs, resignations and a shooting since Mr. Trump returned to the White House.
In hearings before Congress over the past few days, Mr. Kennedy has contradicted himself, telling one group of lawmakers that he would not commit to carrying out Dr. Schwartz’s policies on vaccines, but later recanting that stance in front of another.
But Dr. Schwartz is also a longstanding member of the armed forces, used to following orders in that context, some public health experts noted.
Mr. Trump named two others, Sean Slovenski, a seasoned health care executive, and Dr. Jennifer Shuford, a highly respected epidemiologist and physician, as deputies to Dr. Schwartz. But more quietly, the administration has also appointed Stephen Sayle, a former tobacco executive, as deputy director for legislative affairs. And several other political appointees with known antipathy to vaccines, including Stuart Burns, remain at the agency.
Mr. Kennedy and his appointees have already skirted the normal procedures to try to alter the childhood vaccine schedule, although a federal judge has blocked those efforts. And Dr. Jay Bhattacharya, the C.D.C.’s acting head, recently canceled publication of a report showing the effectiveness of Covid shots last winter.
It is unclear where Dr. Brenner stands on other issues and whether she would go along with Mr. Kennedy’s agenda without question.
“It’s important for people who work in the Office of the Secretary to have their own red lines, and to be willing to push back if a request from their boss comes that is inappropriate,” Ms. Despres said.
Science
Video: Southern Lights Seen From International Space Station
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By Cynthia Silva
June 10, 2026
Science
UC Davis favored less qualified Black, Latino med school applicants, Justice Department claims
The U.S. Justice Department has accused the UC Davis School of Medicine of choosing race “over merit, skill, and competence” in its admissions process, favoring Black and Latino students even when they weren’t as qualified as white and Asian applicants.
The department said its findings, announced Wednesday afternoon, were based on a six-month investigation by its Civil Rights Division. The Justice Department said it found that the Northern California university violated the Supreme Court’s 2023 ruling against race-based determinations in admissions. The findings have been contested by the school.
“Davis Med’s actions reflect both unabashed contempt for the rule of law and plain disregard for the potential public health consequences of putting race over merit, skill, and competence,” Assistant Atty. Gen. Harmeet K. Dhillon of the Justice Department’s Civil Rights Division said in a statement.
“The Department will not allow schools to violate federal law without consequence.”
A spokesperson said the university was “disappointed” with the report and its findings.
“UC Davis School of Medicine strongly disagrees with any characterization of its admissions practices as discriminatory or inconsistent with applicable law,” a school statement read. “The report’s findings do not accurately reflect the school’s rigorous, individualized, and merit-based admissions process and our firm commitment to complying with applicable federal and state antidiscrimination laws.”
The department outlined its case in a 12-page letter to an attorney representing UC Davis, claiming the university violated Title VI of the Civil Rights Act, as interpreted by the Supreme Court’s 2023 Students for Fair Admissions vs. Harvard.
Title VI prohibits institutions receiving federal funding from discriminating based on race, while the 2023 decision banned affirmative action in higher-education admissions.
The Justice Department said its investigation found the medical school “adopted admissions practices with the express purpose of circumventing” the 2023 ruling.
That method was the “Davis Scale,” the department said. The letter called the scale a “continuous measure of socioeconomic disadvantage” that includes parental income and education, growing up in a medically underserved area and other socioeconomic variables.
The Justice Department included UC Davis literature that said the scale had allowed the school to triple the enrollment of Black and Latino students.
In 2024, Davis’ medical school became the third most racially diverse medical school in the country, the Justice Department claimed.
Conversely, the department said its review of medical school admissions data from 2023 to 2025 found that 93% of white and certain Asian applicants had MCAT scores at or above those of the average Black student.
It also showed that Black and Hispanic applicants were admitted at rates up to six times higher than whites and Asians, despite consistently having, on average, lower academic qualifications, according to the department.
The Justice Department said it is attempting to enter into a voluntary agreement with UC Davis to bring the medical school into compliance. The department would eventually sue the medical school if such a resolution is not found.
UC Davis did not indicate whether it would comply with the Justice Department.
“UC Davis is fully committed to meeting the critical healthcare needs of California, particularly those in underserved and under-resourced areas,” the school said in a statement.
The finding mirrors similar investigations into medical schools at UCLA and UC San Diego.
The Justice Department said last month that UCLA’s David Geffen School of Medicine intentionally used race for the last three years to discriminate against white and Asian applicants during admissions.
Science
Why new dads shouldn’t panic about low testosterone
Three months after his son was born, Kevin Maguire felt alone.
It was 2019. He had recently moved to Barcelona with his wife and daughter and was working on marketing projects for Fortune 500 companies. The birth of his son, Bodhi, should have been a joyous event. But Maguire, now 43, became sad and irritable, and didn’t want to be around his newborn. He withdrew from family and friends, often playing video games late into the night or finding excuses to get out of the house.
“I would take the dog out for a walk,” Maguire said. “I wanted to get far away enough that I wouldn’t bump into anyone I knew and I would just sit and cry.”
Desperate for answers, he entered his symptoms online. Maguire, author of the recently published book “The New Fatherhood: Why Everything They Told You About Being a Dad Is Wrong, and How Embracing It Will Transform Your Life,” knew to look for signs of the “baby blues” in his wife. But he was surprised by articles that said men could experience postpartum depression too. The diagnosis resonated and he began writing about his condition and the trials of fatherhood on Substack.
New dads face psychological pressures, from sleepless nights to sky-high bills, which can contribute to postpartum depression. So can shifting hormone levels.
“One thing I found in my lab’s research is that when new dads have really low levels of testosterone, they might report more symptoms of postpartum depression,” said Darby Saxbe, a professor of psychology at USC and author of the recently published “Dad Brain: The New Science of Fatherhood and How It Shapes Men’s Lives.”
While hormonal shifts can create challenges, they also help men adapt to fatherhood, Saxbe explained. Several hormones can spike in men when they become dads, including oxytocin, linked to better relationship quality; vasopressin, associated with emotional bonding; and prolactin, which promotes lactation in women and caregiving behavior in guys.
New dads can also experience a decline in testosterone. According to a 2011 paper from University of Notre Dame professor Lee Gettler, part of the largest study on fatherhood and testosterone ever conducted, men averaged around a 25% drop in testosterone after becoming fathers.
While dads have reasons to be concerned by plummeting levels of testosterone, a modest dip isn’t necessarily a disaster — in fact, it can make men better parents and partners.
“We often get invested in the idea that men should always have the highest possible levels of testosterone,” Saxbe said. “What the research tells us is a little more nuanced. You really want flexibility. You want a hormonal system that can adapt to the different demands of your life.”
The prospect of a decline might scare soon-to-be fathers, especially those on TikTok and Instagram, where accounts push the idea that having “high T” is the key to being a “real man,” according to a recent study in the journal Social Science & Medicine.
Influencers stand to profit persuading men there’s a widespread “masculinity crisis,” the researchers found, noting that 72% of the accounts they analyzed had a stake in testosterone supplements and treatments.
But studies show more testosterone isn’t always better. “We found that when dads have higher testosterone, even before birth, they’re less invested [than men with lower testosterone] in co-parenting a few months after birth,” Saxbe said. High T fathers were more stressed from parenting than their lower T counterparts, and had partners who were less satisfied in their romantic relationships.
This jibes with the challenge hypothesis, which says, in multiple species, testosterone levels rise when males battle for attention from potential mates and go down when it’s time to take care of the young.
While a small decline can be adaptive, dads face mental health risks when their testosterone drops too low.
There is no “normal” level of testosterone, said Dr. Jesse Mills, director of the Men’s Clinic at UCLA Health. Experts recommend that men should consider treatment if their levels dip below 300 nanograms per deciliter (ng/dL). But men metabolize testosterone in different ways, meaning a healthy level for one might be low for another.
“If a new dad comes to me and his testosterone is 298 [ng/dL], he’s below the threshold,” Mills said. “But if he has zero symptoms and everything else is going great — he’s over the moon with his new child, he’s so happy — that’s not somebody I’m going to treat with testosterone.”
He notes that the drop in testosterone fathers experience can partly be attributed to the stresses that come with a new kid: less sleep, a poor diet and fewer trips to the gym. That means there are precautions that expectant fathers can take that don’t involve testosterone replacement therapy (TRT).
Still, while some guys with low testosterone levels might not need TRT, others in the “normal” range could benefit from treatment. (Dads who want another kid soon, beware. Mills notes that testosterone replacement therapy can take a man’s sperm count to zero.)
Both Mills and Saxbe stress that men should be paying attention to symptoms of low testosterone — such as depression and low libido — rather than trying to reach or maintain an ideal number. They also agree that tending to mental health concerns is hugely important for new fathers.
Eventually, after Maguire researched his condition, he recovered after time spent meditating, exercising and bonding with his son.
“A lot of new dads don’t realize how much they’re struggling because they feel ashamed or because they don’t realize it’s common shortly after the birth of a baby,” Saxbe said.
When they struggle, fathers can fixate on testosterone because that’s what modern culture tells them will make them feel better. And sometimes testosterone replacement therapy works. But Saxbe stresses a lot of men could use psychotherapy or support groups that bring dads together, as well as more time bonding with loved ones in general.
“The thing that predicts a man’s well-being and longevity is the quality of his relationships with other people,” said Saxbe. “You can be the world’s best weightlifter. You can have a low body-fat percentage. You can be killing it at work. Those things don’t predict how happy you’re going to be at 80.”
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