The Army, Navy, and Air Force are once again requiring basic trainees to get vaccinated against influenza after the virus quickly swept through an Air Force base in Texas, sickening at least 222 recruits and hospitalizing four.

The outbreak flared just two months after Defense Secretary Pete Hegseth abandoned a decades-long requirement for flu shots. The requirement was intended to keep armed forces healthy in their bases, which provide ideally tight conditions for a variety of pathogens, including influenza, to run rampant. Mandates stem from centuries of intertwining histories of militaries, war, and human pathogens that have firmly established the danger that infectious diseases pose to armed forces.

But in April, Hegseth claimed that flu shot requirements were "not rational" and said removing the requirement was "restoring freedom" to military members.

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Independent advisors for the Food and Drug Administration on Friday voted 9–0 in support of approving Moderna's seasonal mRNA flu vaccine, which a Trump appointee at the agency initially tried to block from even being reviewed.

In an all-day meeting, members of the FDA's advisory committee—known as VRBPAC for Vaccines and Related Biological Products Advisory Committee—pored over data and presentations on the vaccine, which is dubbed mRNA-1010 and branded as mFlusiva. The presentations included a review from FDA scientists, which was supportive of the vaccine.

Data from a Phase 3 trial including over 40,000 adults age 50 and older found the mRNA vaccine was around 27 percent more effective against seasonal flu than a standard flu shot. A smaller Phase 3 trial, involving data from nearly 3,000 people age 65 years and older, showed the shot produces stronger immune responses than a high-dose flu vaccine, which is recommended for this age group. The safety profile of the vaccine was also generally good.

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Although most Americans have eschewed seasonal COVID-19 vaccines, the updated shots continue to show significant protection against cardiovascular disease, especially for those over age 75 and those with underlying medical conditions. That's according to a new study that pulled data from more than 1 million patients in a US Department of Veterans Affairs (VA) health system.

The finding builds on previous data showing that the vaccines significantly lower the risk of COVID-19-associated cardiovascular risks, particularly heart attacks and strokes. But it wasn't a given that the benefit would hold up over time—as the virus evolved, the vaccines were updated, population-level immunity increased from previous infection and vaccination, and risk of severe outcomes fell.

The new study, published in JAMA Internal Medicine, found that the 2024–2025 COVID-19 vaccine continued to protect against COVID-19-associated "major adverse cardiovascular events" (MACE), which include cardiovascular death, heart attack, stroke, and hospitalization for heart failure.

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For the first time, the American College of Obstetricians & Gynecologists (ACOG) has released its own recommendations for maternal vaccination, providing formal guidance that diverges from that of the Centers for Disease Control and Prevention amid unprecedented policy changes and meddling from anti-vaccine Health Secretary Robert F. Kennedy Jr.

ACOG President Camille Clare blamed "changing national recommendations coupled with rampant vaccine misinformation" for the confusion among patients and health care professionals about vaccines during pregnancy.

"It is incredibly important for the public to have access to reliable, evidence-based information on maternal immunizations from a trusted source. ACOG is proud to be that source," Clare said in a statement.

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