Infective endocarditis is a serious infection of the inner lining of the heart, usually involving a heart valve. Early symptoms of infective endocarditis can include fever, chills, tiredness, shortness of breath, and feeling generally unwell. It can affect adults of any age, but it is more common in people with damaged or artificial heart valves, congenital heart disease, or a history of injection drug use. Infective endocarditis usually needs urgent treatment with antibiotics given into a vein for several weeks, and some people also need surgery to repair or replace a valve. The outlook can vary, but infective endocarditis can be life-threatening without prompt care.
How many people live with Infective endocarditis?
Because infective endocarditis is usually a sudden infection of the heart’s inner lining, experts usually count new cases each year rather than how many people are living with it at one time; worldwide, about 1.1 million people were affected in 2019 (Institute for Health Metrics and Evaluation, 2024). In the United States, commonly cited estimates suggest about 29,000 to 36,000 people are diagnosed each year (National Heart, Lung, and Blood Institute, 2022).
Overview
Infective endocarditisSymptoms
Infective endocarditis often causes fever, chills, tiredness, and sweating. Many living with infective endocarditis also notice a new or changing heart murmur, shortness of breath, or ongoing weakness. Early symptoms of infective endocarditis can feel flu-like at first.
Outlook and prognosis
With infective endocarditis, outlook depends on how quickly treatment starts, which germ is involved, and whether a heart valve is damaged. Many people do well with several weeks of antibiotics, while others need valve surgery. Early treatment improves the prognosis.
Causes and risk factors
Infective endocarditis usually starts when bacteria enter the bloodstream and attach to a heart valve or damaged heart lining. Risk rises with valve disease, artificial valves, congenital heart conditions, injection drug use, poor dental health, and IV lines.
Genetic influences
Genetics usually do not directly cause infective endocarditis. Still, inherited heart problems, especially some valve or structural conditions, can raise the chance of infective endocarditis by making it easier for germs to attach to the heart.
Diagnosis
Infective endocarditis is diagnosed using symptoms, blood cultures to look for germs in the bloodstream, and heart imaging, usually echocardiography. Doctors combine these findings because early symptoms of infective endocarditis can look like other illnesses.
Treatment and drugs
Infective endocarditis is usually treated in the hospital with several weeks of intravenous antibiotics, and many people need blood tests and heart scans to track progress. If the infection damages a valve or does not clear, heart surgery may be needed.
Symptoms
Infective endocarditis often starts with feeling run-down, feverish, or unusually tired, and some people do not realize the heart is involved at first. The early symptoms of infective endocarditis can look like a stubborn flu, with fevers, chills, and body aches that do not settle. Symptoms vary from person to person and can change over time. As the infection affects the heart and the rest of the body, breathing problems, swelling, skin changes, or sudden nerve symptoms can appear.
Fevers may come and go or stay high, often with shaking chills. Many people with infective endocarditis feel sick for days or weeks rather than just a day or two.
Everyday tasks can feel harder, like climbing stairs or getting through a workday without needing to rest. This heavy, washed-out tiredness is a common symptom of infective endocarditis.
Some people wake up drenched in sweat and feel sore in their muscles or joints. These symptoms can be easy to mistake for a viral illness or simple overexertion.
You may get short of breath when walking, lying flat, or doing chores that used to feel easy. Some people also notice a cough or chest discomfort if the infection starts to strain the heart.
How people usually first notice Infective endocarditis?
Infective endocarditis often begins quietly, with symptoms that can feel more like a stubborn flu than a heart problem: fever, chills, night sweats, deep tiredness, and aching muscles are often how people first notice it. Many living with infective endocarditis also develop shortness of breath, chest discomfort, a new or changing feeling of being unwell, or symptoms that do not improve after what seemed like a routine infection, dental procedure, or use of an IV line. In some, the first warning signs are more sudden and serious, such as confusion, weakness, trouble speaking, or severe shortness of breath, which can happen if the infection affects the heart or sends clots to other parts of the body.
Types of Infective endocarditis
Infective endocarditis can show up in a few well-recognized patterns, and the course can feel very different from one type to another. Sometimes, symptoms cluster together in recognizable ways. Some forms start suddenly with high fever and a rapid decline, while others build more quietly over days to weeks. When people ask about the types of infective endocarditis, doctors usually mean differences in how fast it develops or which part of the heart is affected.
Acute
Acute infective endocarditis usually starts fast, often with high fever, chills, marked fatigue, and feeling seriously unwell within a short time. Many living with this type can become short of breath quickly or feel weak enough that normal tasks, like walking across a room, become hard. It tends to cause more dramatic symptoms and often needs urgent hospital care.
Subacute
Subacute infective endocarditis develops more gradually, with symptoms that can be easy to dismiss at first. People may notice ongoing low-grade fever, night sweats, weight loss, tiredness, or aches that linger for weeks rather than a sudden collapse. The early symptoms of infective endocarditis in this form can look like a stubborn flu or unexplained exhaustion.
Native valve
This type affects one of the heart's own valves rather than an artificial one. Symptoms often include fever, fatigue, shortness of breath, or a new heart murmur, but the exact pattern depends on which valve is infected and how much damage develops. Not everyone will experience every type of symptom.
Prosthetic valve
Prosthetic valve infective endocarditis happens on an artificial heart valve and may occur soon after valve surgery or much later. Symptoms can include fever and weakness, but some may also notice worsening shortness of breath, swelling, or signs that the valve is not working properly. It can be harder to spot because the symptoms are not always classic at the start.
Right-sided
Right-sided infective endocarditis affects the valves on the right side of the heart, most often the tricuspid valve. Along with fever and fatigue, this type more often causes chest pain, cough, and shortness of breath because infected material can travel to the lungs. One person might struggle mostly with breathing symptoms, while another notices more fever and chills.
Can I slow down the onset of symptoms?
No, there is no proven way to meaningfully slow the start of symptoms once infective endocarditis, a serious infection of the heart’s inner lining or valves, has begun; the best-supported steps are about lowering the chance of getting it in the first place. Good dental and gum care, avoiding injected drugs, getting tooth, skin, or other infections treated quickly, and careful care of any IV lines are linked to lower risk, but they do not guarantee prevention. If you have an artificial heart valve or certain high-risk heart problems, your doctor may recommend preventive antibiotics before some dental procedures, and while these steps can help reduce risk and support earlier care, they cannot promise the infection will be prevented.
What genetics can tell you about symptoms
For infective endocarditis, genetics usually does not tell doctors which symptoms you will have, how severe they will be, or when they will start, because this illness is mainly driven by an infection in the heart lining or valves rather than an inherited gene change. That said, some inherited heart conditions or rare immune system differences can make someone more likely to develop endocarditis or have a more complicated course, but they do not create a clear, predictable symptom pattern. In everyday terms, the symptoms people notice, such as fever, fatigue, shortness of breath, or new heart-related problems, are shaped much more by the germ involved, the heart valve affected, and how quickly treatment starts than by genetics.
Causes and risk factors
Infective endocarditis usually starts when bacteria, and less often fungi, enter the bloodstream and attach to a heart valve or the inner lining of the heart. The risk is higher in people with an artificial valve, a previous episode of infective endocarditis, a heart defect, or valve damage from age or another heart problem. Germs can get in during injection drug use, through a catheter or other medical device, or from poor dental health and some dental procedures. Genes are not a common direct cause, but some inherited heart conditions can make infective endocarditis more likely. Think of risk factors as pieces of a puzzle, not the whole picture, and talk with your doctor if you are concerned about your risk factors for infective endocarditis.
What are the most common causes or risk factors?
Infective endocarditis usually happens when germs, most often bacteria, get into the bloodstream from places like the mouth or skin, or through needles or medical tubes, and then stick to a heart valve or the inner lining of the heart. The biggest risk factors are an artificial heart valve, a past episode of this infection, damaged heart valves, certain heart problems present from birth, injected drug use, implanted heart devices such as a pacemaker, long-term tubes in a vein, and poor dental health.
Environmental and biological risk factors
Infective endocarditis is most likely when germs get into the bloodstream and find a place in the heart where they can settle. The main risk factors for infective endocarditis are certain heart conditions and medical situations that make this easier. Doctors often group risks into internal (biological) and external (environmental), which helps explain who is at risk for infective endocarditis.
Heart valves that are scarred, narrowed, or leaky give germs an easier surface to attach to. This makes infective endocarditis more likely than in a heart with smooth, healthy valves.
Replacement valves and valve repair material can be easier for bacteria or fungi to stick to than natural tissue. The risk is often highest in the months after surgery, but it can stay higher over time.
A past episode can leave behind scarring or other changes inside the heart. That can raise the chance of infective endocarditis happening again.
Some congenital or acquired heart defects create unusual blood flow that roughens the inner heart surface. This can increase the risk of infective endocarditis, especially if the defect is unrepaired or was repaired with prosthetic material.
Genetic risk factors
Infective endocarditis is usually not passed down in families, and there is no single gene known to cause it. The main genetic risk factors for infective endocarditis are inherited heart differences that change how blood moves through the heart or how a valve is built. Some risk factors are inherited through our genes. These inherited traits do not mean someone will definitely develop infective endocarditis, but they can make it easier for bacteria to attach to damaged or unusual heart tissue.
No single gene: Infective endocarditis itself is not considered a classic inherited disease caused by one gene change. In most cases, genetic risk comes indirectly through inherited heart conditions that affect the valves or the flow of blood.
Congenital heart defects: Some people are born with structural differences in the heart, such as a hole between chambers or changes in how blood leaves the heart. These inherited or partly inherited defects can create abnormal flow that makes the heart lining or valves easier for germs to settle on.
Bicuspid aortic valve: Some people inherit an aortic valve with two flaps instead of the usual three. This common inherited valve difference can lead to earlier wear, leaking, or narrowing, which raises the risk of infective endocarditis over time.
Mitral valve prolapse: Mitral valve prolapse can run in families, especially when the valve is thickened or leaks. In those forms, the valve surface may be more vulnerable to infective endocarditis than a normal valve.
Inherited tissue disorders: A small number of inherited conditions affect the connective tissue that supports the heart valves and nearby blood vessels. When these conditions make a valve floppy, stretched, or leaky, the chance of infection on the valve can be higher.
Family history: A family history of unusual heart valves or congenital heart disease can be a clue to inherited risk. Carrying a genetic change does not guarantee the condition will appear, but it may help explain why some families have more valve-related risk than others.
Lifestyle risk factors
Some daily habits can raise the chance of developing infective endocarditis by making it easier for bacteria or fungi to enter the bloodstream. The most important lifestyle risk factors for infective endocarditis involve behaviors that increase bloodstream infection risk or allow ongoing sources of infection in the mouth or skin. These factors do not guarantee illness, but they can meaningfully raise risk, especially in people who already have heart valve problems or implanted cardiac devices.
Injecting drugs can introduce bacteria or fungi directly into the bloodstream, especially when needles, syringes, or preparation equipment are shared or not sterile. Repeated injections also damage skin and veins, creating more opportunities for infection to spread to the heart.
Infrequent brushing, flossing, and dental checkups can lead to gum disease, tooth decay, and oral infections that let bacteria enter the blood. This is one of the clearest examples of how lifestyle affects infective endocarditis.
Ignoring tooth pain, abscesses, bleeding gums, or other dental problems can allow a persistent source of bacteria to remain in the mouth. Those bacteria may intermittently enter the bloodstream and increase the risk of heart valve infection.
Tattoos or piercings done in unsterile settings can introduce bacteria through broken skin. The risk is higher when aftercare is poor or when the area becomes red, swollen, or infected.
Risk prevention
Infective endocarditis is hard to prevent completely, but the risk can often be lowered by reducing the chances that bacteria enter the bloodstream and settle on the heart. This matters most for people with certain valve problems, an artificial heart valve, a history of infective endocarditis, or some congenital heart conditions. Prevention can mean both medical steps, like antibiotics for a small group of high-risk people before certain procedures, and lifestyle steps, like good dental care and avoiding injection drug use. Even if you can’t remove all risks, prevention can reduce their impact.
Healthy teeth and gums lower the chance that bacteria from the mouth get into the blood and trigger infective endocarditis. Brushing, flossing, and regular dental visits matter because bleeding gums and untreated dental disease can raise risk.
Most people do not need antibiotics before dental work, but some with the highest-risk heart conditions do. Ask your clinician how to prevent infective endocarditis after dental work if you have an artificial valve, prior infective endocarditis, or certain congenital heart conditions.
Injecting nonmedical drugs can send bacteria or fungi directly into the bloodstream and is a major risk factor for infective endocarditis. If stopping feels hard, treatment for substance use and access to sterile equipment can greatly reduce harm.
Skin infections, infected wounds, and untreated infections elsewhere in the body can sometimes spread bacteria into the blood. Getting medical care early for fever, spreading redness, pus, or worsening pain may help lower the risk.
Can you prevent Infective endocarditis?
Not always, but you can often lower the risk of infective endocarditis, which is a serious infection of the inner lining of the heart or the heart valves. The most helpful steps are good daily dental care, regular dental checkups, avoiding injection drug use, and getting medical advice quickly for possible infections. If you have certain heart problems or an artificial valve, your doctor may also recommend antibiotics before some dental procedures.
Transmission
Infective endocarditis is usually not passed from one person to another, so close contact, coughing, kissing, or sharing food do not typically spread it. Instead, it develops when germs, most often bacteria and less often fungi, enter the bloodstream through things like poor dental health, skin infections, injected drugs, or some medical and dental procedures, then attach to the heart lining or valves.
If you are wondering how infective endocarditis spreads, the key point is that it usually starts from germs already getting into the blood rather than from catching it from someone nearby. The risk is higher in people with damaged or artificial heart valves, certain heart defects, or a history of injecting drugs, but infective endocarditis is still considered uncommon and not highly infectious in the usual sense.
When to test your genes
For infective endocarditis, genetic testing is not a routine tool for early detection or for tailoring treatment. Care is guided by your symptoms, blood cultures, heart imaging, and risk factors such as valve disease, prosthetic valves, or injection drug use; gene testing is considered only if another inherited condition is separately suspected.
Diagnosis
Infective endocarditis is usually diagnosed by putting together symptoms, blood tests, heart imaging, and risk factors rather than relying on one finding alone. People with infective endocarditis may feel unusually tired, feverish, short of breath, or simply much less well than usual over days to weeks. Doctors usually begin with a careful medical history and exam, because the diagnosis of infective endocarditis depends on how these clues fit together.
Your doctor asks about fever, chills, fatigue, shortness of breath, recent dental work, injected drug use, and any heart valve problems or artificial valves. A detailed family and health history can help, but the main focus is on personal risk factors and recent infections.
The exam may pick up a new or changing heart murmur, fast heart rate, fever, or signs that infection has affected the skin, eyes, or nails. These findings are not enough on their own, but they can raise suspicion for infective endocarditis.
Several blood samples are taken from different times or sites to look for bacteria or fungi in the bloodstream. This is one of the most important tests because it can identify the germ causing the infection and help guide antibiotic treatment.
Routine blood work looks for signs of infection and inflammation, and other lab tests may help rule out common conditions. Doctors also check kidney function and other organs, since infective endocarditis can affect more than the heart.
How is Infective endocarditis diagnosed?
Infective endocarditis is usually diagnosed by putting together several clues: your symptoms, a doctor’s exam, repeated blood tests to look for germs in the bloodstream, and a heart ultrasound to check the valves for signs of infection. Many people also have an electrocardiogram, also called an ECG, and sometimes scans such as a CT scan if the team needs to look for complications or the diagnosis is still unclear. There is no single test that proves it in everyone, so doctors often confirm it by combining the blood test results with the heart scan findings and the overall pattern of illness.
Stages of Infective endocarditis
Infective endocarditis does not have defined progression stages. That is because it is usually described by how severe the infection is, which heart valve is affected, and whether problems such as heart failure, stroke, or spread of infection have developed, rather than by a set step-by-step pattern over time. Doctors usually start with a conversation about symptoms such as fever, chills, tiredness, shortness of breath, or the early symptoms of infective endocarditis, then examine the heart and look for signs of infection. Diagnosis is usually confirmed with blood tests to find the germ and a heart ultrasound, called an echocardiogram, to look for infected tissue or valve damage.
Outlook and prognosis
The outlook for infective endocarditis varies widely and depends on the causative organism, how quickly treatment begins, whether a heart valve or implanted device is involved, and the person’s age and overall health. With prompt antibiotics and, when needed, valve surgery, many people recover, but complications such as heart failure, stroke, abscess formation, and recurrent infection can worsen the prognosis. In-hospital mortality is typically around 15% to 30%, and the risk is higher with Staphylococcus aureus infection, prosthetic valve endocarditis, delayed diagnosis, or severe sepsis. Even after successful treatment, some people have lasting valve damage or need long-term follow-up for relapse or late cardiac complications. Prognosis is generally better when infective endocarditis is diagnosed early and managed by a multidisciplinary team with expertise in cardiology, infectious diseases, and cardiac surgery.
Long-term effects
After treatment, many people recover well from infective endocarditis, but some are left with lasting heart or health problems. The long-term picture is often shaped by how quickly the infection was found, which heart valve was involved, and whether there were complications such as stroke or heart failure. Some may find that the long-term effects of infective endocarditis show up as lower stamina, ongoing follow-up needs, or damage that does not fully reverse. Long-term effects vary widely, and the outlook is usually better when treatment starts early and complications are limited.
Infective endocarditis can scar or destroy a heart valve, which may leave it too narrow or too leaky. Over time, this can cause breathlessness, fatigue, or swelling and may sometimes lead to valve repair or replacement surgery.
If valve damage is severe, the heart may have trouble pumping blood effectively long after the infection clears. For many, this can mean getting winded climbing stairs, needing ongoing medicines, or having limits on daily activity.
Scarring or strain on the heart can raise the chance of rhythm problems, including fast or uneven heartbeats. Some people notice palpitations, dizziness, or reduced exercise tolerance months or years later.
Pieces of infected material can travel to the brain during infective endocarditis and cause a stroke. Lasting effects may include weakness, speech trouble, memory changes, or problems with balance, depending on the area injured.
How is it to live with Infective endocarditis?
Living with infective endocarditis can feel as if a serious infection has moved from the background to the center of daily life, bringing exhaustion, fever, shortness of breath, pain, and long hospital stays for intravenous antibiotics. For many people, this means putting work, school, exercise, and usual routines on hold while the heart is monitored closely and, in some cases, surgery is needed to repair or replace a damaged valve. The effects reach beyond the person who is ill, because family and friends often help with transportation, medications, appointments, and emotional support while everyone adjusts to uncertainty and recovery.
Treatment and drugs
Infective endocarditis is usually treated in the hospital at first because the infection affects the lining or valves of the heart and needs fast, close care. Treatment often starts with strong antibiotics given through a vein for several weeks, and doctors may change the drug once blood tests show which germ is causing the infection. If first-line treatments don’t help, specialists may try second-line options, especially if the germ is hard to treat or the infection involves an artificial valve. Some people with infective endocarditis also need surgery to repair or replace a damaged heart valve, drain an abscess, or remove infected material if the infection is not clearing or the heart is struggling. After treatment, follow-up care is important to watch for relapse, manage side effects, and lower the risk of infective endocarditis coming back.
Can you cure Infective endocarditis?
Often, yes: infective endocarditis, a serious infection of the inner lining of the heart or its valves, can often be cured if it is found and treated quickly. Treatment usually means strong antibiotics, often given through a vein for several weeks, and some people also need surgery if a heart valve has been badly damaged. Even when the infection is cleared, some may still have lasting heart damage, so early treatment and close follow-up are very important.
Non-drug treatment
Infective endocarditis often affects daily life quickly, with extreme tiredness, fever, shortness of breath, or trouble doing normal activities. Alongside medicines, non-drug therapies are mainly used to remove infected tissue, fix heart damage, and lower the chance that the infection will return. The exact plan depends on which heart valve is affected, whether a device is involved, and how sick someone is at the time of diagnosis.
Surgery may be needed if infective endocarditis has badly damaged a heart valve, caused heart failure, or left a large growth on the valve that could break off and travel. The surgeon may repair the valve or replace it, depending on the damage and the person’s overall health. This is often part of treatment when people ask when is surgery needed for infective endocarditis.
If the infection involves a pacemaker, defibrillator, or other heart device, removing the infected hardware is often necessary. Leaving an infected device in place can make it much harder to clear the infection completely.
Doctors also look for the place where the bacteria entered the bloodstream, such as an infected line, skin wound, or dental source. Removing an infected IV line or draining another pocket of infection can help prevent infective endocarditis from continuing or coming back.
Dental treatment may be needed if gum disease, a tooth abscess, or another mouth infection is thought to be the source. Good daily mouth care and regular dental follow-up can lower the risk of future episodes, especially for people with damaged or artificial valves.
Your genes may have an impact on how drugs work for you
For infective endocarditis, inherited differences in your genes usually do not play a major role in choosing treatment, because the main medicines are antibiotics picked to match the specific germ causing the infection. In real life, doctors are much more likely to adjust treatment based on things like kidney function, liver health, drug allergies, age, pregnancy, and how well the antibiotic reaches the infection, especially if a heart valve is involved. Genetic testing to guide medicine choice, sometimes called pharmacogenomics, is not a routine part of care for infective endocarditis.
Pharmacological treatments
Treatment usually starts quickly with antibiotics given through a vein, often in the hospital, because infective endocarditis can damage heart valves and spread to other parts of the body. The exact drugs depend on which germ is causing the infection, whether a natural or artificial valve is involved, and how severe things are at the start. Not everyone responds to the same medication in the same way, so doctors often adjust antibiotics for infective endocarditis once blood culture results come back. Most people need several weeks of treatment, and some also need surgery if the infection has seriously affected the heart.
Vancomycin plus cefepime is a common starting treatment when doctors need to act before culture results are ready. This combination covers many likely bacteria, including staph and strep, while the team narrows treatment to the exact cause.
Penicillin G or ceftriaxone is often used when infective endocarditis is caused by susceptible streptococcal bacteria. In some cases, gentamicin may be added for part of the course, but this depends on the germ and the person’s kidney function.
Methicillin-sensitive Staphylococcus aureus is usually treated with nafcillin, oxacillin, or cefazolin, while methicillin-resistant strains are usually treated with vancomycin or daptomycin. If one option isn’t effective, second-line or alternative drugs may be offered based on culture results and side effects.
Ampicillin plus ceftriaxone is now commonly used for enterococcal infective endocarditis, especially when doctors want to avoid kidney damage from older combinations. Some people may instead receive ampicillin plus gentamicin or vancomycin, depending on resistance patterns and allergies.
Genetic influences
Most cases of infective endocarditis are not passed down directly through families. The infection usually begins when bacteria, and sometimes fungi, enter the bloodstream and stick to a heart valve or inner heart lining that has already been damaged or changed. Genetics is only one piece of the puzzle, but inherited heart differences, including some valve problems and heart defects present from birth, can make infective endocarditis more likely. That means genes may affect the setting in which the infection takes hold, rather than causing the infection on their own. Researchers are also studying whether small inherited differences in the immune system change the risk of infective endocarditis, but those links are not strong enough to guide routine care. Genetic testing is not usually part of diagnosing infective endocarditis itself, although it may be helpful if doctors suspect an inherited heart condition is part of the reason someone is at higher risk.
Is Infective endocarditis genetic?
Genetics usually do not directly cause infective endocarditis. Still, inherited heart problems, especially some valve or structural conditions, can raise the chance of infective endocarditis by making it easier for germs to attach to the heart.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a normal part of being human and are widely found in the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, having a variant connected with a condition suggests a possible link rather than a certain diagnosis, especially when more than one gene and environmental factors are involved. In some situations, however, a single well-understood variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
When treatment for infective endocarditis needs to start quickly, doctors usually choose antibiotics based on the bacteria involved, the heart valve affected, and how well your kidneys are working, rather than on your genes. If you are wondering how genetics influence antibiotics for infective endocarditis, the main effect is usually on side effect risk or how your body handles a drug, not on the diagnosis itself. Not every difference in response is genetic, but inherited changes can make a few medicines more risky for some people. For example, a rare inherited change can make gentamicin and similar antibiotics more likely to damage hearing, so doctors may avoid them or monitor more closely if there is a personal or family history of that kind of reaction. If infective endocarditis leads to heart valve surgery or the need for a blood thinner such as warfarin, genes can also affect the dose, although doctors still fine-tune treatment with blood tests and careful follow-up. For most people living with infective endocarditis, routine pharmacogenetic testing is not standard, but it may be useful when there is a strong history of unusual drug reactions or a medication with a known gene-related risk is being considered.
Interactions with other conditions
Infective endocarditis can become more serious when it happens alongside other heart problems, especially damaged heart valves, artificial valves, or certain congenital heart conditions. People living with infective endocarditis may also have a harder course if they have kidney disease, diabetes, cancer, or a weakened immune system, because the body may not clear the infection as easily. Doctors call it a “comorbidity” when two conditions occur together. Day to day, this can mean symptoms such as fever, exhaustion, shortness of breath, or early symptoms of infective endocarditis are easier to miss or may be blamed on another illness that is already being treated. Infective endocarditis can also interact with stroke, heart failure, and bloodstream infections, since the infection can damage the heart or send infected material to other parts of the body. Because treatment often involves strong antibiotics and sometimes surgery, care teams also look closely at whether another disease could raise the risk of side effects or complicate recovery.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Infective endocarditis?
Other infections, especially pneumonia, the flu, COVID-19, or a blood infection, can cause fever, chills, tiredness, and shortness of breath that may look a lot like infective endocarditis. Doctors may also need to rule out heart failure, heart valve problems, or inflammation of the heart because these can cause similar warning signs, such as feeling very weak, trouble breathing, chest discomfort, or a new heart murmur.
History
Before modern treatment, an infection on a heart valve could turn a fever that would not settle into weeks of exhaustion, weight loss, breathlessness, or a sudden stroke-like illness. What we now call infective endocarditis was recognized gradually, because its signs can look like many other problems at first and the infection often affects the whole body, not just the heart.
Throughout history, people described lingering fevers linked with heart disease, but doctors did not clearly separate infective endocarditis from other serious infections until the 19th century. Early physicians learned from autopsies that some people who had prolonged fever and worsening heart symptoms had infected growths on the heart valves. As medical science evolved, doctors became better at linking everyday symptoms such as chills, night sweats, weakness, and new heart murmurs with this hidden infection.
A major turning point came when bacteria were identified as the cause in many cases. That helped explain why infective endocarditis could develop after bacteria entered the bloodstream, sometimes after dental disease, skin infection, surgery, or injecting drugs, though not everyone with these risks develops it. In the early 20th century, the condition was still often fatal, and treatment options were very limited.
The biggest change in the history of infective endocarditis came with blood cultures, antibiotics, and later heart surgery. Blood cultures allowed doctors to find the germ causing the infection in many cases, making treatment more precise. Over time, imaging tests such as echocardiography, which uses sound waves to look at the heart, made it much easier to spot infected valves and related damage without waiting for surgery or autopsy.
Today, infective endocarditis is still a serious illness, but outcomes are much better than they once were. Knowing the condition’s history helps explain why early symptoms of infective endocarditis can still be missed at first and why fast diagnosis matters so much. Modern care now combines antibiotics, careful monitoring, and sometimes surgery, with prevention focused on reducing known risks rather than treating everyone the same way.