E. Coli Infection: What to Know and How to Protect Yourself (2024)

E. coliis the shortened name forEscherichia coli. This family of bacteria is large and diverse. There are both good and bad strains ofE. coli. Some strains cause infections in the digestive tract and other organ systems. When it infects the intestines,E. colicauses diarrhea. People get E. coli infections by ingesting contaminated food or water. It can also spread from person to person.

E. coli-relateddiarrhea has no specific treatment. Instead, doctors manage it with supportive treatment, which involves administering extra fluids to avoid dehydration.

This article provides an overview ofE. colidiarrheal infection, including its symptoms, causes, diagnosis, and treatment.

See Also

What’s an E. coli Infection?How Do You Get E. Coli – And How to Prevent ItSymptoms and causes - Mayo ClinicE. coli - Symptoms and causes

There arehundreds Trusted Source PubMed Central Highly respected database from the National Institutes of Health Go to sourceof different types ofE. colibacteria. All healthy warm-blooded animals, including humans, have E. coli in their gut within a day or two after birth. Most of these bacteria are harmless or even beneficial. They help our digestive system break down food.

When you hear that people are getting sick fromE. coli, there are onlysix subtypes Trusted Source Centers for Disease Control and Prevention (CDC) Governmental authority Go to sourcethat can cause this. They are as follows.

• Shiga toxin-producingE. coli(STEC),which is responsible for most outbreaks in the United States
  • Other names for it include Verocytotoxin-producingE. coli and enterohemorrhagicE. coli. You may also hear people call it by the name of the most common strain of this subtype,E. coliO157:H7.
• enterotoxigenicE. coli, which is themost commoncause of traveler’s diarrhea
• enteropathogenicE. coli, which was once a cause of outbreaks among infants and children but is now rare
• enteroinvasiveE. coli, which is relatively rare
• enteroaggregativeE. coli, which can also cause traveler’s diarrhea
• diffusely adherentE. coli

AnE. colidiarrheal infection can show up anywhere from1–10 daysafter exposure. Most people start having symptoms within 3–4 days of ingesting contaminated food or water.

Symptoms may include:

• mild fever or no fever at all
• nausea and vomiting
• stomach cramps, which are often thefirst symptomand can be severe
• watery diarrhea that may become bloody after 24 hours

Most people get better within 5–7 days. However, if you have diarrhea that lasts for longer than 3 days or diarrhea with a high fever, blood, or vomiting that prevents you from keeping down liquids, seek prompt medical care.

Prompt medical care is also necessary for the following symptoms of dehydration:

• dizziness or confusion
• fatigue
• increased thirst
• skin that remains tented after you pinch it
• very little urine or very dark urine

People can still spread bacteria for several weeks or possibly months after they feel better. Young children tend to carry them longer than adults.

Visiting your doctor is the only way to know for sure if you have anE. coliinfection. Inmost cases Trusted Source PubMed Central Highly respected database from the National Institutes of Health Go to source, your doctor will take a detailed history of your illness to narrow down the cause of the diarrhea.

Taking a stool sample isnot usually necessary. Diarrhea typically resolves on its own, whether it is due to a virus orE. coli. However, there are times when a stool sample is necessary, including in people with:

• an age of 70 years or above
• bloody diarrhea
• diarrhea lasting for longer than 7 days
• fever
• inflammatory bowel disease or a weakened immune system
• moderate to severe diarrhea

E. coliinfections usually go away by themselves. These diarrheal infections are unpleasant butrarely dangerous. Treatment relies on preventing dehydration. It is important to drink lots of liquids. Oral rehydration solutions, broths, and bouillon are good choices to replace fluids and electrolytes.

Youshould not Trusted Source Centers for Disease Control and Prevention (CDC) Governmental authority Go to sourcetake antibiotics or over-the-counter antidiarrheal medications unless your doctor advises it. These are not likely to be useful and may increase the chance of developing hemolytic uremic syndrome (HUS). HUS is a potentially life threatening complication.

AnE. coliinfection starts when you swallow something that contains a disease-causing strain. This contamination has minuscule amounts of feces in it. These microscopic quantities can go undetected during food processing and preparation.

Undercooked ground meats, unpasteurized milk, and contaminated vegetables are somecommon sources of infection. With meat, the bacteria taint the meat during slaughter.

E. colican alsobe presenton people’s hands and in the following:

• animals — including cows, goats, and sheep — and their living areas
• feces of people with the infection
• raw fruits and vegetables, especially leafy greens and sprouts
• soft cheeses from raw milk
• soil
• unpasteurized milk and juice
• bodies of water, including lakes, ponds, streams, and swimming pools

In the U.S., the average person’s risk of getting anE. coliinfection is very low. About265,000 Trusted Source Centers for Disease Control and Prevention (CDC) Governmental authority Go to sourcepeople in the U.S. get anE. coliinfection with STEC each year. This is significantly less than 1% of the population. Serious cases are rare.

Those at highest risk of anE. coliinfection include:

• adults older than 65 years of age
• children younger than 5 years of age
• people with weakened immune systems, such as those taking immunosuppressant drugs and those with cancer, HIV, or diabetes

Serious complications fromE. coliare very rare. About5–10% Trusted Source Centers for Disease Control and Prevention (CDC) Governmental authority Go to sourceof people in the U.S. who are sick fromE. coli— specifically STEC — become seriously ill with HUS. This complication can lead to kidney failure. Themost vulnerable Trusted Source Centers for Disease Control and Prevention (CDC) Governmental authority Go to sourcegroups are young children and older adults.

Symptoms of HUS tend to develop when diarrhea is improving, about 7 days after the illness begins. Symptoms include:

• feeling very tired
• losing the pink color in your cheeks and inside the lower eyelids
• urinating less frequently

People with HUS need hospitalization. Although most recover within a few weeks, permanent kidney damage and death are possible.

Doctors often recommend that people with high risk STEC are hospitalized for fluids and monitoring, especially if they are an older adult, a younger person, or someone who is immunocompromised.

In the U.S., about 30 people die each year fromE. coliinfections.

You can reduce your chance of getting sick fromE. coli. Although your risk of an infection is already extremely low, you can take steps to further reduce Trusted Source Centers for Disease Control and Prevention (CDC) Governmental authority Go to sourceyour possible exposure. For example, you can:

• Avoid eating high risk foods. Contaminated food causes more than half the cases of E. coli illness.
• Avoid untreated water.
• Stay away from people who are ill with anE. coliinfection.
• Wash your hands before preparing food, after diapering infants, and after touching grazing animals — such as cows, sheep, or goats — or their surroundings.
• Use a food thermometer when you cook ground beef to make sure that it reaches an internal temperature of 160°F (71ºC).

High risk foods to avoid include:

• undercooked ground beef
• unpasteurized milk or juice
• soft cheeses made from unpasteurized milk
• unpasteurized apple cider
• alfalfa and raw bean sprouts

Here are some more questions that people commonly ask about E. coli.

Although most cases ofE. coliare not dangerous, contact your doctor if your symptoms do not go away within a few days. Also, contact your doctor if you have bloody diarrhea, abdominal pain, high fever, or vomiting that prevents you from keeping down liquids.

E. coliinfections usually last about a week or less.

People with anE. coliinfection arevery contagious. The infection can easily spread from person to person. Practice good hand hygiene and stay home to prevent transmission.

Although rare in the U.S.,E. coliinfections can cause significant diarrheal disease. They are a common cause of traveler’s diarrhea outside this country.

When outbreaks occur in the U.S., they are almost always due to the STEC subtype. Although most people recover within a few days, this subtype carries the risk of HUS. Contact your doctor if you develop bloody diarrhea or have diarrhea that lasts for longer than a few days.