Can I Get a Heart Infection?

Cardio Renal Foundation is a 501(c)(3) tax-exempt charity organization. Your donation advances our mission to provide a solution beyond dialysis.

Yes — but the honest answer starts with a sorting, because "heart infection" is one phrase covering three different conditions, and they do not behave alike. The one this page is really about is the rarest and most dangerous of the three: endocarditis, an infection of the heart's inner lining, usually its valves. It is uncommon. It is also the heart infection that damages valves, causes heart failure, and throws infected fragments around the body — and its risk list overlaps this site's readership in one specific, important way involving dialysis access. Its companion on this site is the faster, more familiar story: can I get a kidney infection? That infection announces itself in a day. This one can whisper for weeks.

Three Different Things Wear the Same Name

Endocarditis is an infection of the endocardium — the inner lining of the heart — and in practice it means the valves. Germs settle on a valve, multiply, and build clumps of infected material. It is the subject of everything below. Myocarditis is inflammation of the heart muscle itself, most often set off by a viral infection; it can weaken the pump for a time and is a different disease with a different story — chest pain, breathlessness, and fatigue after a virus are its usual calling cards. Pericarditis is inflammation of the sac around the heart, often following a viral illness too; its signature is a sharp chest pain that eases sitting up and leaning forward. When a clinician hears "heart infection," they sort these three apart first. The famous one, the dangerous-in-slow-motion one, is the valve infection — so endocarditis takes the rest of this page.

First, the Framing: Suspected Endocarditis Is Prompt Care

Endocarditis comes in a fast form that declares itself in days and a slow form — subacute — that builds over weeks to months, and the slow form is the trap this page exists to disarm. Its symptoms are the kind people apologize for mentioning: a low fever that keeps coming back, exhaustion that sleep doesn't fix, sweating at night, aches, losing weight without trying. Read that list again and notice how completely it impersonates "a flu that never quite leaves" or "just getting older." In a person with a damaged or artificial heart valve, a history of endocarditis, or a dialysis access, a fever that will not quit is not a wait-and-see symptom — it is a prompt, same-week and often same-day conversation with a doctor, and it deserves the words "could this be endocarditis?" said out loud in the room. Catching it is what the good outcomes are made of. Everything below is the why.

How It Happens: A Bloodstream, a Door, a Damaged Valve

The American Heart Association's account of the mechanism is plain. Bacteria — less often, fungi — enter the bloodstream. In most healthy people, microbes that briefly slip into the blood are cleared before they can do anything. But germs that reach a heart valve that is damaged, scarred, or artificial can attach, and there they multiply into infected clumps called vegetations. Heart valves have a limited blood supply, which makes it hard for the immune system — and for medicines — to fully clear an infection once it takes hold; that sheltered foothold is why this infection is measured in weeks of treatment, not days. The doors into the bloodstream are everyday ones: poor dental health and gum disease; the brief bacterial showers from ordinary brushing and flossing, larger around dental procedures; skin infections and wounds; other infections elsewhere in the body; implanted cardiac devices; and injected drugs, which carry bacteria straight in. Note what is not on that list: other people. Endocarditis is not contagious. You do not catch it from a cough — it is assembled from your own bloodstream, a door, and a valve that gives germs a place to land.

Who Is at Risk — and the Chapter That Belongs to Our Readers

The AHA's adult risk list: heart valve disease or damage to the valves; a previous bout of endocarditis; a prosthetic (artificial) valve or material used in a valve repair; a heart transplant with valve disease; implanted devices such as a pacemaker or defibrillator; some congenital heart defects; older age, including the calcium buildup age lays down on valves; a weakened immune system; and IV drug use. Then there is the chapter written for this site's exact audience, and it is not a small one. A 2024 review in the journal Healthcare, devoted entirely to endocarditis in dialysis patients, reports that the infection's incidence among people on dialysis — hemodialysis especially — is significantly higher than in people not on dialysis, with death rates in this population reported between 20 and 40 percent despite modern treatment. The mechanism is the access. A fistula, a graft, and above all a central venous catheter are, by design, doors between the outside world and the bloodstream, opened several times a week; the review identifies staph bacteria — the skin's own residents — as the leading cause of endocarditis in hemodialysis patients, precisely because access points are where they enter, and weakened immunity from kidney failure itself adds to the risk. This is why dialysis teams drill access hygiene, why a fever in a dialysis patient triggers blood cultures fast, and why "my access looks a little red" is never a report to save for next week. The access is a lifeline. It is also a door, and doors get guarded.

What It Feels Like: Two Speeds, One Trap

The fast form — acute endocarditis — can begin suddenly: fever and chills, a racing heart, fatigue, night sweats, joint and muscle aches, headache, and at the serious end, cough, difficulty breathing, and chest pain. The slow form assembles itself gradually: fatigue first, a low-grade fever, a fast heart rate, weight loss, sweating, and anemia — a pale, drained, vaguely unwell picture that can run for weeks before anyone images a valve. A new heart murmur is the classic finding, but it is the clinician's clue, not yours; yours is the pattern. So the rule from the framing section bears repeating in symptom language: fever plus any heart-valve history, any artificial valve or device, or any dialysis access, persisting beyond what a cold explains, is endocarditis until a workup says otherwise. The workup itself holds one detail worth knowing in advance, because it explains the order of events in the emergency room: teams draw blood cultures early — sets of blood samples that identify the exact germ — because naming the organism is what lets them aim the long treatment that follows. The cultures coming before the first antibiotic dose is deliberate sequencing by the hospital team, not delay, and it is never a reason to postpone getting to the hospital: the drawing takes minutes, and it is one of the first things they do.

The Damage: Valves, Failure, and Fragments That Travel

Left to grow, a vegetation eats the valve it sits on. A valve that no longer closes properly leaks with every beat, and a leaking, overworked heart is how an infection becomes heart failure — breathlessness, fluid, exhaustion — sometimes gradually, sometimes fast. The second harm travels. Fragments of the infected clump can break loose and ride the bloodstream — embolization — landing in the brain as a stroke, in the lungs, in the spleen or kidneys, and in the eyes: a sudden change in vision can be this infection announcing itself at a distance, which is why this page's sibling exists: can heart disease affect your eyes? Treatment, in general terms, is a long course of IV antibiotics, chosen and timed to the organism the cultures named — and in some cases, especially with complications or an infection that won't clear, surgery to repair or replace the ruined valve. That is the whole argument for the framing section, stated once more in outcomes language: the difference between antibiotics-only and antibiotics-plus-a-destroyed-valve is mostly how long the infection had the room to itself.

Prevention That Actually Exists

There is no vaccine and no general shield, but the AHA's prevention list is concrete. The foundation is dental: maintain good oral health, get regular dental care, brush and floss — a mouth with less gum disease sends smaller bacterial showers into the blood, every day, procedure or no procedure. Then the specific rule that is most often misremembered, stated the way the AHA states it. Antibiotic prophylaxis — a preventive antibiotic before a procedure — is recommended only for the people at highest risk of serious outcomes: those with a prosthetic valve or prosthetic material used in a valve repair; those who have had endocarditis before; those with certain congenital heart diseases (your cardiologist tells you if yours is one); and heart transplant recipients with valve disease. And only before certain dental procedures — those that involve manipulation of gum tissue, work around the roots of the teeth, or perforation of the mouth's lining. For the highest-risk group, antibiotics may also be reasonable before certain procedures involving infected skin or related tissue. Everyone else, and every other procedure, is outside the rule — which means preventive antibiotics are a prescription decision made by your team, never a leftover pill taken on your own initiative. The rest of prevention is door-keeping: care for skin wounds, report infections rather than riding them out, keep dialysis access hygiene exactly as your unit taught it, tell every doctor and dentist about your valve history, and report a fever that follows a procedure or lingers past its welcome. None of it is dramatic. All of it is aimed at the two ingredients this infection needs: bacteria in the blood, and time.

Why This Research Matters

Stand back and look at the shape of this page: an infection whose worst outcomes land on the heart's valves and the brain's arteries, and whose highest-risk everyday population includes the people whose kidneys have already failed — because the treatment keeping them alive opens a door to the bloodstream three times a week. The Cardio Renal Foundation supports research toward a solution beyond dialysis — research aimed at a day when kidney failure is answered without permanent doors into the circulation, and at easing the burden it places on the heart downstream. That is a direction, not a promise — but it is aimed squarely at the burden this page describes.

So — can you get a heart infection? Yes: three conditions share the name, and the one to respect is endocarditis, the slow valve infection assembled from bloodstream bacteria and a place for them to land. Its tells are a fever that won't quit, exhaustion that sleep doesn't fix, night sweats and aches in a person with a valve story — and for our readers, one more fact worth keeping beside the dialysis schedule: the access that sustains life is also this infection's favorite door, which is why access care and fast fever reports are drilled the way they are. Suspected, it is prompt care, blood cultures, and a long, aimed course of treatment. Caught early, it is a very different story from caught late.

At the Cardio Renal Foundation (Cardio Renal Foundation Inc, EIN 33-4359765), we publish education for exactly this reader — a valve, a device, or a dialysis access on the problem list, and a low fever that has outstayed three weeks of explanations. Support from readers like you helps us keep publishing it.

This article is informational only and is not meant to replace the advice of your qualified healthcare provider. Nothing here diagnoses any condition or recommends any treatment. Never start, stop, skip, or change the dose of a prescribed medicine without speaking to the clinician who prescribed it. A fever that will not quit in a person with valve disease, an artificial valve, or a dialysis access calls for prompt medical care — and chest pain, new breathlessness, sudden weakness, or sudden vision changes are 911 symptoms. Research supported by this Foundation is investigational only. As with any issues related to your health, check with your doctor.