Rat-bite fever is a rare bacterial infection that usually starts after a rat bite or scratch, or sometimes after contact with rodents or contaminated food. Early symptoms of rat-bite fever often include fever, chills, headache, muscle aches, vomiting, and a rash, and some people also develop joint pain. It can affect both children and adults, and symptoms usually begin within days to about 3 weeks after exposure. Not everyone will have the same experience, but without treatment rat-bite fever can become serious and in some cases life threatening. Treatment is usually with antibiotics, and most people improve well when care starts promptly.
How many people live with Rat-bite fever?
Worldwide, there is no single reliable estimate of how many people have rat-bite fever at any given time. In the United States, no recent national estimate is consistently reported either, partly because this infection is very rare and many cases may be missed or not formally tracked.
Overview
Rat-bite feverSymptoms
Rat-bite fever often starts with fever, chills, headache, and muscle pain. Many with rat-bite fever also develop vomiting, a rash, or joint pain. Early symptoms of rat-bite fever can feel flu-like at first.
Outlook and prognosis
With prompt antibiotic treatment, the outlook for rat-bite fever is usually very good. Most people recover fully within weeks. Without treatment, rat-bite fever can lead to serious complications affecting the heart, brain, or other organs.
Causes and risk factors
Rat-bite fever is caused by bacteria spread by rat bites, scratches, or contact with rat saliva, urine, or droppings. Risk rises with pet or wild rat exposure, crowded housing, poor sanitation, and some jobs. Children may be affected more often.
Genetic influences
Genetics are not thought to play a major role in rat-bite fever. Rat-bite fever is mainly linked to exposure to the bacteria, though normal differences in immune response may slightly affect how sick someone becomes.
Diagnosis
Doctors diagnose rat-bite fever using symptoms, recent rat exposure, and lab tests. Blood or fluid from a rash, wound, or painful joint may be checked for the bacteria, since early symptoms of rat-bite fever can mimic other infections.
Treatment and drugs
Rat-bite fever is treated with antibiotics, usually penicillin or doxycycline. Many improve within days, but it is important to finish the full course to clear the infection and lower the risk of joint, heart, or other serious complications.
Symptoms
Rat-bite fever often starts with a sudden fever and body aches that can make an ordinary day feel hard to get through. Early on, this might look like the flu, especially if the bite or scratch seemed minor. The early symptoms of rat-bite fever can begin within a few days, although for some people they show up later. Not everyone has the same pattern, and some symptoms come and go.
Fever is often the first sign and may come on quickly with chills, sweating, and a washed-out feeling. In some people, the fever returns in waves instead of staying constant.
A rash often appears a few days after the fever starts, especially on the hands and feet. It may look flat, bumpy, or spotty and can be harder to notice on darker skin.
Painful, stiff, or swollen joints are common in rat-bite fever, especially in the knees, ankles, wrists, or elbows. For many, this can mean walking, climbing stairs, or opening jars feels unusually hard.
Headache, muscle pain, and back pain can feel a lot like a strong flu. Many people also feel very tired and generally unwell.
How people usually first notice Rat-bite fever?
Rat-bite fever often first shows up a few days to a few weeks after a rat bite, scratch, or close contact with rodents, when someone who seemed fine suddenly develops fever, chills, headache, muscle aches, and often vomiting. As the illness goes on, many people with rat-bite fever also notice joint pain and a rash, often on the hands and feet, which can be an important clue because the original bite may already look mild or be healing. If these first signs of rat-bite fever appear after any rodent exposure, prompt medical care matters, because treatment usually works well and can prevent more serious complications.
Types of Rat-bite fever
Rat-bite fever can show up in a few recognized forms, and the symptoms can differ depending on which germ is involved and how the infection was picked up. In practice, the main types of Rat-bite fever are the streptobacillary form, the spirillary form, and Haverhill fever, which is a food- or drink-related form of streptobacillary infection. Symptoms don’t always look the same for everyone. For many living with Rat-bite fever, the early symptoms of Rat-bite fever start with fever, chills, and body aches, but the timing of the bite, rash, and joint pain can vary.
Streptobacillary form
This is the most common form in the United States and Europe, and it often causes fever, vomiting, headache, muscle pain, and a rash on the hands and feet. Many people also develop painful or swollen joints a few days after the fever begins. The bite itself may look mild or may already be healing by the time symptoms appear.
Spirillary form
This form is more often reported in Asia and tends to cause repeated episodes of fever, swollen lymph nodes, and an ulcer or reopening of the bite site. A rash can happen, but joint pain is usually less prominent than in the streptobacillary form. Some may find that symptoms come and go rather than building steadily.
Haverhill fever
This is a streptobacillary form linked to contaminated food or milk rather than a direct bite. It often causes sudden fever, sore throat, vomiting, and a rash, sometimes with muscle or joint pain as well. People with this variant of Rat-bite fever may not remember any animal bite at all.
Can I slow down the onset of symptoms?
No, there is no proven way to slow the onset of rat-bite fever once the infection has started; the main goal is to reduce the chance of infection in the first place, not to delay or prevent it after exposure. The most helpful steps are avoiding rat bites and scratches, washing any wound right away with soap and water, and getting prompt medical care after contact with a rat, which may lower risk but cannot guarantee that the illness will be prevented. If fever, rash, vomiting, or painful joints show up after a bite, scratch, or close rat contact, early treatment can help you recover better, so acting quickly is wise even though it may not change when symptoms begin.
What genetics can tell you about symptoms
For rat-bite fever, genetics usually does not give clear, practical answers about which symptoms someone will have, how severe they will be, or when they will start. In most cases, symptoms are shaped more by the type of bacteria causing the infection, how the exposure happened, and how quickly treatment begins, although different bacterial causes can lead to somewhat different patterns of illness. Researchers have not identified a well-established inherited genetic profile in patients that reliably predicts the course of rat-bite fever.
Causes and risk factors
Rat-bite fever usually starts when bacteria carried by rats or other rodents get into the body through a bite, a scratch, or broken skin. It can also follow contact with rodent saliva, urine, or droppings, or food or water contaminated by them. Risk factors for rat-bite fever include keeping pet rats, working with rodents, and living or working in places with rodent infestations or poor sanitation. Cuts in the skin and a weakened immune system can raise the chance of infection, but rat-bite fever is not known to have a clear inherited genetic cause. Having risk factors doesn’t mean you’ll definitely develop the condition.
What are the most common causes or risk factors?
Rat-bite fever is caused by bacteria carried by rats, and sometimes other rodents, most often after a bite or scratch or after touching rat saliva, urine, or droppings through broken skin. The main risk factors are keeping pet rats, handling rodents at work or in labs, and living or working in places with rat infestations or poor sanitation; in some cases, people get it from food or water contaminated by infected rodents. There are no known inherited or family-based risk factors.
Environmental and biological risk factors
Rat-bite fever is an infection that becomes more likely after contact with infected rats or places contaminated by them. Some risks are carried inside the body, others come from the world around us. The main risks are bites, scratches, and exposure of broken skin or the mouth, nose, or eyes to rat fluids. Knowing these risks can help explain who may develop early symptoms of rat-bite fever after an exposure.
A rat bite is the most direct and best-known risk factor for rat-bite fever. Even a small bite can introduce bacteria under the skin.
Open cuts, scratches, eczema, or other breaks in the skin make infection more likely when rat saliva or urine touches the area. This can happen during handling, even without a clear bite.
Living or working in places with frequent rat exposure raises risk, including laboratories, pet shops, farms, and rodent-infested housing. Rats can carry the bacteria without looking sick.
Cleaning cages, bedding, or surfaces soiled by rats can expose people to bacteria. The risk goes up if contaminated hands or splashed fluid reach the mouth, nose, eyes, or broken skin.
Genetic risk factors
For rat-bite fever, genetics are not considered a main cause or a well-defined risk factor. This illness is an infection rather than an inherited condition, so it is not usually passed through families in the way genetic disorders are. Researchers have not found specific gene changes that clearly cause rat-bite fever or reliably predict who will develop it.
Not inherited: Rat-bite fever is not known to be a hereditary disease passed from parent to child. Having a family member who had it does not, by itself, mean your genes put you at higher risk.
No known genes: There are no established gene variants that doctors use to explain or predict rat-bite fever. Because of that, genetic testing is not part of routine evaluation for genetic risk factors for rat-bite fever.
Immune response differences: Inherited traits can shape how the immune system reacts to infections in general. Still, no well-established genetic pattern is known to determine who gets rat-bite fever or who will have early symptoms of rat-bite fever.
Lifestyle risk factors
Rat-bite fever is mainly linked to behaviors that increase contact with rodents or their saliva, urine, or droppings, rather than to diet or exercise. The most important lifestyle risk factors for rat-bite fever involve how people handle pet rodents, clean cages, care for bites or scratches, and manage food and hand hygiene. Understanding how lifestyle affects rat-bite fever can help lower the chance of infection and reduce delays in treatment.
Frequent close handling of pet rats or other rodents can raise the chance of bites, scratches, or saliva contact that spreads rat-bite fever. Letting rodents lick broken skin or the mouth also increases infection risk.
Cleaning cages, bedding, or rodent waste without careful handwashing can expose you to bacteria that cause rat-bite fever. Touching your face, eating, or drinking before washing up adds to that risk.
Ignoring a rodent bite or scratch, or not washing it promptly with soap and water, can make infection more likely. Delaying medical attention after a bite may also allow symptoms to develop before treatment starts.
Eating or drinking in areas where rodents are handled or housed can increase the chance of contaminated saliva or droppings getting into food. Poor kitchen and food-storage habits that allow rodent contact can also contribute.
Risk prevention
Rat-bite fever is uncommon, but it can become serious quickly if it is missed. Most cases happen after a rat bite or scratch, or after contact with rat saliva, urine, or droppings, including contaminated food or water. For many, prevention comes down to safer handling of rodents, cleaner living spaces, and getting prompt care for any wound or fever after exposure. Prevention is about lowering risk, not eliminating it completely.
The best way to prevent rat-bite fever is to avoid bites, scratches, and direct contact with rats whenever possible. This includes pet rats, wild rats, and places where rats may live or travel.
If you keep pet rats or work with rodents, wash your hands well after touching them, their cages, bedding, or food dishes. Wearing gloves for cage cleaning and avoiding kissing pets or bringing them near your mouth can lower the chance of infection.
If a rat bites or scratches you, wash the area right away with soap and running water for several minutes. Seek medical advice promptly, especially if the skin is broken, because early care may help prevent rat-bite fever and its early symptoms from being overlooked.
Reducing rats in and around the home lowers the risk of rat-bite fever. Sealing holes, storing food securely, clearing trash, and using safe pest control can make rodent contact less likely.
Can you prevent Rat-bite fever?
You can lower the risk of rat-bite fever, but you cannot prevent every case. The best-known ways to help prevent it are avoiding bites and scratches from rats and other rodents, washing your hands after handling them or cleaning their cages, keeping food and surfaces clean, and getting medical care if you are bitten or scratched. Even with care, some infections can still happen, so quick cleaning of the wound and prompt medical advice matter.
Transmission
Rat-bite fever usually spreads to people through a bite or scratch from an infected rat or other rodent, but it can also happen if rodent saliva, urine, or droppings get into broken skin, the eyes, nose, or mouth, or if food or water has been contaminated. This means someone cleaning a cage, handling a pet rat, or eating food exposed to rodents could become ill even without a clear bite.
When people ask how rat-bite fever spreads, the key point is that it does not usually pass from one person to another. Rat-bite fever is considered uncommon and not highly contagious in everyday life; the main risk comes from direct or indirect contact with infected rodents, not from being around someone who has the infection.
When to test your genes
For rat-bite fever, genetic testing is not used for early detection or to tailor care. If you have fever, rash, joint pain, or a rat bite or rodent exposure, the right next step is prompt medical evaluation and infection testing, not a DNA test.
Diagnosis
Rat-bite fever is usually diagnosed by putting together the story of a recent rat bite, scratch, or close contact with rodents and the pattern of symptoms that follow. Many living with rat-bite fever develop fever, rash, and joint pain days to weeks after the exposure, though not everyone has the same symptoms. Doctors usually begin with a careful history and exam, because the diagnosis of rat-bite fever can be easy to miss if the exposure is not mentioned.
Your doctor will ask about any recent rat bite, scratch, handling of pet or wild rodents, or contact with food or water that may have been contaminated. This history is often one of the biggest clues, especially when symptoms started soon after the exposure.
Doctors look for patterns such as fever, chills, headache, muscle aches, a rash on the hands or feet, and painful or swollen joints. They will also check for signs of dehydration, low blood pressure, skin changes, or other clues that suggest the infection has spread.
Basic blood tests can show signs of infection or inflammation, such as a high white blood cell count. These tests do not confirm rat-bite fever on their own, but they help support the diagnosis and show how sick someone may be.
Blood samples may be sent to the lab to try to grow the bacteria causing the infection. Tests may feel repetitive, but each one helps rule out different causes, and the lab may need special methods because this germ can be hard to detect.
How is Rat-bite fever diagnosed?
Rat-bite fever is usually diagnosed by putting together your symptoms and your recent contact with rats or other rodents, especially after a bite, scratch, or handling a rodent or its bedding. A doctor will often ask about fever, rash, vomiting, and painful or swollen joints, then do blood tests and sometimes test fluid from a joint or a wound to look for the germ causing the illness. Because it can look like other infections, the diagnosis often depends on both the test results and a clear history of rodent exposure.
Stages of Rat-bite fever
Rat-bite fever does not have defined progression stages. This is because it is usually an infection that develops over days to weeks rather than a condition with clear step-by-step phases of decline. Often the process begins when you notice changes in daily life, such as fever, chills, joint pain, vomiting, or a rash after a rat bite, scratch, or contact with rodents. Doctors usually diagnose rat-bite fever by reviewing symptoms, asking about rodent exposure, and sometimes using blood tests or samples from other body fluids, while follow-up focuses on how well symptoms improve with treatment.
Outlook and prognosis
With prompt antibiotic treatment, the outlook for rat-bite fever is usually very good, and most people recover fully without lasting problems. If treatment is delayed or the infection is missed, complications such as abscesses, pneumonia, hepatitis, meningitis, or infection of the heart valves and other tissues can occur and may prolong recovery. Mortality is uncommon when appropriate therapy is given, but older reports suggest untreated rat-bite fever may be fatal in roughly 7% to 13% of cases. Prognosis is worse in people who develop sepsis, endocarditis, or central nervous system involvement. Early recognition, blood cultures or other diagnostic testing when needed, and completion of the full antibiotic course are the main factors that improve outcomes.
Long-term effects
Most people with rat-bite fever recover fully when it is diagnosed and treated early, so long-term problems are not common. The main concern is when treatment is delayed or the infection becomes severe, because rat-bite fever can then injure joints, the heart, the brain, or other organs. Doctors often describe these as long-term effects or chronic outcomes. In severe cases, what starts with the early symptoms of rat-bite fever can lead to lasting health problems months or years later.
Rat-bite fever can trigger painful, swollen joints, and in some people the inflammation lasts after the infection is gone. Over time, this may limit walking, climbing stairs, or using the hands for daily tasks. In some cases, repeated inflammation can lead to lasting joint damage.
If the infection reaches the inner lining of the heart, it can damage heart valves. This may leave someone with long-term shortness of breath, fatigue, or a heart murmur and can require ongoing heart care.
Rarely, rat-bite fever can lead to meningitis or other infection around the brain and spinal cord. When that happens, some people may have lasting headaches, hearing problems, weakness, or changes in thinking and concentration.
Severe infection can spread through the bloodstream and harm organs such as the kidneys, liver, or lungs. Recovery may be slow, and some people are left with lasting organ dysfunction depending on how serious the illness became.
How is it to live with Rat-bite fever?
At first, rat-bite fever can feel like your whole routine has been suddenly knocked off balance: fever, chills, headache, muscle and joint pain, and often a rash can leave you exhausted, sore, and unable to work, study, or keep up with normal daily tasks. For many people, even simple things like walking, sleeping comfortably, or eating well can become harder for a time, and if the infection is not treated promptly, it can become serious and affect the joints, heart, or other organs. The good news is that with timely medical treatment, most people improve, and while people around you may need to help with practical support during recovery, rat-bite fever is usually linked to contact with infected rodents rather than spreading easily from person to person.
Treatment and drugs
Rat-bite fever is treated with antibiotics, and starting them promptly usually lowers the risk of serious problems such as joint, heart, or brain infections. Treatment often looks different for each person, but many people improve with penicillin or a similar antibiotic, while those with a penicillin allergy may be given another option such as doxycycline or ceftriaxone. If someone is very unwell, vomiting, or has signs the infection has spread, treatment for rat-bite fever may begin in the hospital through a vein before switching to pills at home. Doctors may also drain an infected bite wound or a pocket of pus if needed, and pain relief, fluids, and rest can help with recovery. If fever, rash, or joint pain starts after a rat bite or after contact with rodents, it is important to get medical care quickly rather than waiting to see if it passes.
Can you cure Rat-bite fever?
Yes, rat-bite fever can usually be cured with antibiotics, especially when treatment starts early. Most people recover fully, but without treatment the infection can become serious and affect the heart, brain, or other parts of the body. Treatment may also include fluids, pain relief, and care for any complications while the antibiotics clear the infection.
Non-drug treatment
Rat-bite fever can leave people feeling wiped out, achy, and unsteady, so supportive care often matters in day-to-day recovery even though antibiotics are the main treatment. Alongside medicines, non-drug therapies focus on protecting the body while the infection settles and on treating any local damage from the bite or scratch. The right mix depends on how severe rat-bite fever is and whether it has affected joints, the heart, or other organs.
Careful cleaning of the bite or scratch helps lower the amount of bacteria on the skin and supports healing. Dressings may need regular changes so the area stays clean, dry, and easy to monitor for spreading redness or drainage.
Extra rest can help when fever, muscle pain, and fatigue make normal tasks feel harder. Drinking enough water and other fluids supports recovery, especially if sweating, vomiting, or poor appetite have led to dehydration.
Some people with rat-bite fever need hospital care for intravenous fluids, oxygen, or close monitoring if they are very unwell. This is more likely when there are signs of low blood pressure, severe dehydration, trouble breathing, or concern for infection in the heart or other organs.
If the bite forms an abscess or a joint fills with infected fluid, a procedure may be needed to drain it. For many, treatment begins not at the pharmacy, but with removing trapped fluid so pressure, pain, and ongoing infection can improve.
Your genes may have an impact on how drugs work for you
For rat-bite fever, treatment is usually based on which antibiotic is most likely to clear the infection, and genetic differences are not a major part of care for most people. In other words, doctors do not usually use genetic testing to pick treatment for this illness; things like drug allergies, pregnancy, age, and how well the kidneys or liver are working matter much more. Some people do break down medicines a little differently, which can affect side effects or how strongly a drug works, but this is not a well-established part of routine treatment for rat-bite fever.
Pharmacological treatments
Treatment for rat-bite fever usually relies on antibiotics, and most people improve once the infection is recognized and treated promptly. Penicillin is the standard choice in many cases, while other antibiotics are used if penicillin is not a good fit. Severe illness, or infection that has spread to places like the heart, often needs treatment in the hospital first. Not everyone responds to the same medication in the same way, so doctors may adjust the plan based on allergy history, test results, and how sick someone is.
This is a main first treatment for rat-bite fever, especially when symptoms are more intense or the infection has spread beyond the skin. It is usually given by vein at first in the hospital, then changed to pills once you are improving.
This oral form may be used after initial IV treatment or for milder illness, depending on the situation and your doctor’s judgment. For many living with rat-bite fever, this can mean finishing treatment at home after the fever and joint pain start to settle.
This antibiotic is often used when daily IV treatment is needed and can be a practical alternative to penicillin in some cases. It is one of the antibiotics for rat-bite fever doctors may choose when they want strong coverage with once-daily dosing.
This is a common option for people who cannot take penicillin because of an allergy. It may be used for both forms of rat-bite fever, but it is not usually the first choice when the infection is severe.
Genetic influences
For most people, rat-bite fever has much more to do with contact with infected rats or contaminated food than with inherited risk. Rat-bite fever is not considered an inherited condition, and family history usually does not explain why someone gets it. It’s natural to ask whether family history plays a role. In rare cases, people born with certain immune system problems may have a harder time fighting bacterial infections in general, which can affect how severe an illness becomes, but that is different from having a gene that causes rat-bite fever. When doctors think about the causes of rat-bite fever, they usually focus on exposure history and symptoms rather than genetic testing.
Is Rat-bite fever genetic?
Genetics are not thought to play a major role in rat-bite fever. Rat-bite fever is mainly linked to exposure to the bacteria, though normal differences in immune response may slightly affect how sick someone becomes.
Having a genetic risk is not necessarily a diagnosis
Changes in genes are common in the general population and are a normal part of human biology. Most of these changes do not directly affect health and simply reflect natural human diversity. For many genes, having a change linked to a condition suggests a possible association rather than a certain diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-understood change in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
When rat-bite fever brings high fever, joint pain, or a spreading rash, the main goal is to start the right antibiotic quickly so the infection does not become more serious. For most people with rat-bite fever, treatment choices are guided more by the type of infection, how sick you are, age, pregnancy, and kidney or liver health than by genetic testing. If you are wondering how genetics affect antibiotics for rat-bite fever, the answer is that inherited differences usually play only a small role in day-to-day treatment. Not every difference in response is genetic, but some inherited traits can slightly change how your body handles certain medicines or how likely side effects are. Even so, common treatments for rat-bite fever, such as penicillin or doxycycline when appropriate, are not usually selected on the basis of pharmacogenetic results. If you have had unusual reactions to antibiotics in the past, sharing that history with your doctor can help them choose the safest treatment and monitor you closely.
Interactions with other conditions
Rat-bite fever can matter more if you are already living with another illness, especially a heart valve problem, a weakened immune system, or chronic liver disease. In these settings, the infection may spread more easily through the bloodstream and raise the risk of serious complications such as infection of the heart lining, known medically as endocarditis. Day-to-day, it can feel like one health issue amplifies the other, because fever, rash, and joint pain from rat-bite fever can be harder to sort out when another condition is already causing fatigue or inflammation. People with diabetes or others who have trouble fighting infection may also become sicker faster and need closer monitoring. Rat-bite fever can also resemble or briefly worsen joint symptoms, so the early symptoms of rat-bite fever are sometimes confused with other causes of arthritis or bloodstream infection. Because of this, it is important for doctors to look at the full picture, including recent animal exposure and any existing medical conditions.
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 Rat-bite fever?
Rat-bite fever can look like the flu or COVID-19 at first because it often causes fever, headache, muscle aches, and nausea. Doctors may also think about other infections that can cause fever with a rash or painful joints, such as Lyme disease, Rocky Mountain spotted fever, or a skin or blood infection that starts after a bite. A recent rat bite, scratch, or close contact with rodents can be an important clue that points more toward rat-bite fever.
History
A small bite or scratch from a rat, or even close contact with rodents, could once turn into days of fever, rash, and aching joints without anyone understanding why. Long before modern testing, people living in crowded cities, dock areas, farms, and places with poor sanitation were the ones most often affected, because rats and mice were part of daily life. Throughout history, people described illnesses after rat bites that seemed to come on suddenly, then sometimes improve for a short time before returning.
By the 19th century, doctors in Europe, the United States, and Japan were writing clearer medical descriptions of rat-bite fever and noticing that it did not look the same in every person. Some developed fever and a spotted rash, while others had more severe joint pain or repeated waves of illness. Not every early description was complete, yet together they helped doctors recognize the early symptoms of rat-bite fever as part of the same condition rather than separate, unrelated infections.
As medical science evolved, researchers learned that rat-bite fever was caused by bacteria linked to rodents, which was a major step forward. That changed care in practical ways: instead of simply treating fever or pain and waiting, doctors could begin using antibiotics once the illness was recognized. Over time, public health efforts such as better housing conditions, safer food storage, improved workplace hygiene, and more careful handling of pet and laboratory rodents also helped reduce risk.
Today, rat-bite fever is still uncommon, but it has not disappeared. Many living with rat-bite fever are diagnosed after contact with pet rats, wild rodents, or contaminated food or water, and awareness matters because the illness can be missed at first. Looking back helps explain why prompt medical care after a rat bite, scratch, or unexplained fever following rodent exposure is taken much more seriously now than it was in the past.