A study of more than one million US veterans found that people who got the 2024-2025 COVID vaccine were 57.9% less likely to die of cardiovascular causes than those who skipped it. That's not a rounding error. That's a number that should be on the front page of every newspaper in the country, and instead we're out here arguing about whether vaccines are even worth talking about anymore.
What the researchers actually found
Using health records from the US Department of Veterans Affairs, researchers compared two groups: roughly 350,000 veterans who received both the COVID and flu vaccines on the same day, and about 700,000 who got only the flu shot. The average age was around 70, and 92% of the study participants were male. Over approximately eight months of follow-up, the data told a pretty striking story.
According to the New York Post's coverage of the study, those who received the 2024-2025 COVID vaccine showed a 37.7% lower relative risk of major adverse cardiovascular events, the clinical term for the composite category that includes heart attacks, cardiovascular deaths, strokes, and hospitalizations for heart failure. The vaccine was linked to a 58% reduction in cardiovascular death, a 38.5% drop in heart attack risk, and a 41.9% lower chance of being hospitalized for heart failure. The stroke result did not reach statistical significance, which is the one asterisk worth keeping in mind.
The benefit was sharpest among the oldest and sickest patients. In adults 75 and older, the vaccine showed 50.7% effectiveness at preventing COVID-associated major cardiovascular events. If your grandparent's cardiologist hasn't mentioned this yet, maybe bring it up at the next appointment.
Why would a respiratory virus wreck your heart anyway
This is the part that people still don't fully appreciate about COVID-19, even six years into this thing. The virus doesn't just sit politely in your lungs. It kicks off a systemic inflammatory response that can do serious damage to your cardiovascular system, and that damage can show up weeks or months later.
Dr. Glenn Hirsch, a cardiologist at National Jewish Health in Denver, explained it plainly to Fox News Digital. Acute inflammation from infections like COVID raises the risk of blood clotting and can make arterial plaques unstable. When a plaque ruptures, the body tries to heal it by forming a clot. That clot can block an artery. That blocked artery becomes a heart attack or a stroke. The vaccine interrupts that chain either by preventing infection in the first place or by reducing the severity of illness, which limits the inflammatory damage downstream.
This is not a new theory. It is consistent with what researchers have found about other infectious disease vaccines and cardiovascular protection for years. The flu shot has long been associated with reduced cardiac events in high-risk patients. COVID vaccines appear to work through a similar mechanism.
The honest caveats, because we're doing that here
Look, this is an observational study, which means the researchers cannot prove the vaccine caused the reduction in cardiovascular events. They can only show an association. Hirsch, who was not involved in the research, was careful to say exactly that, noting that observational trials always carry some risk of confounding even after statistical adjustments.
He also pointed out that the protective effect here was smaller than in earlier COVID vaccine studies. That gap is probably explained by a few things: recent variants have generally caused less severe illness, many unvaccinated people now have some natural immunity from prior infections, and declining COVID testing makes it harder to definitively link a cardiovascular event to an active COVID infection in the first place. So the signal is real but somewhat diluted compared to what the first rounds of research showed.
What Hirsch did not do was suggest people ignore the findings. His bottom line, quoted directly: people should discuss COVID vaccination with their healthcare team annually, the same way they would any other infectious disease vaccine. That seems like a reasonable place to land.
The context nobody wants to talk about right now
This study lands at a genuinely strange moment for COVID vaccine policy in America. The Trump administration has spent the better part of this year systematically undermining public health infrastructure, cutting CDC staff, and lending a megaphone to vaccine skeptics in ways that would have been unthinkable under any previous administration of either party. Robert F. Kennedy Jr. is running the Department of Health and Human Services. Let that sit for a second.
Meanwhile, out in the actual scientific literature, researchers are publishing studies of over a million veterans showing that the COVID vaccine is associated with a 58% reduction in cardiovascular mortality. These two realities are living in the same country at the same time and the cognitive dissonance required to hold both of them without screaming is getting harder to manage by the week.
The VA study covers a population that skews older, mostly male, and heavily burdened with underlying conditions. Those are exactly the people who have the most to gain from any intervention that reduces cardiovascular risk. They are also, not coincidentally, the demographic most likely to have voted for the people currently trying to make them suspicious of vaccines.
The Dingo Take
Here is a study involving more than one million people, drawn from one of the largest and most comprehensive health databases in the world, showing that a vaccine most Americans are now being quietly discouraged from getting is associated with cutting their risk of dying from a heart attack nearly in half. And we live in a political moment where the correct response to that information, according to the people running the federal government, is apparently skepticism and personal freedom to roll the dice.
The science here is not complicated. COVID causes inflammation. Inflammation causes cardiovascular events. The vaccine reduces inflammation. Fewer people die. Dr. Hirsch put it in plain English and the data backed him up. What is complicated is the part where the Secretary of Health and Human Services has spent decades calling vaccines a public health catastrophe and is now, somehow, in charge of public health.
Nobody is asking anyone to take a vaccine on blind faith. The researchers themselves were upfront that this is observational data with limitations. But a 57.9% reduction in cardiovascular death is not statistical noise you can wave away with a podcast episode. At some point the question stops being about the science and starts being about who we've decided to trust instead of it.
