Jordan Ellis
Escherichia coli (E. coli) is a group of bacteria that can cause infections in humans. While some strains of E. coli cause mild infections, others can lead to severe illnesses, including intestinal infections, kidney damage, and even death. E. coli infections can result in hospitalizations, particularly in older adults, and intensive care admissions in cases of hemolytic uremic syndrome (HUS). The number of hospitalizations due to E. coli varies depending on the specific strain and outbreak. For instance, during the largest E. coli O157 outbreak in 1999, 9% of the 781 affected individuals were hospitalized, while in another outbreak, over a quarter of the 700 ill persons were hospitalized.
| Characteristics | Values |
|---|---|
| Common causes | Eating raw or undercooked hamburger meat, spinach, lettuce, sprouts, unpasteurized milk, apple juice, apple cider, salami, contaminated drinking water |
| Symptoms | Diarrhea, bloody diarrhea, abdominal pain, stomach pain, nausea, vomiting, fever, kidney damage, kidney failure, Hemolytic Uremic Syndrome (HUS) |
| Treatment | Rehydration, antidiarrheals, blood transfusions, kidney dialysis |
| Hospitalization rate | 26% (in the case of the 1993 outbreak), 9% (in the case of the 1999 outbreak), 32.4% (in the case of patients with IED over 60) |
| Intensive care unit admission rate | 7.5% (in the case of the 1993 outbreak), 2% (in the case of the 1999 outbreak), 32.4% (in the case of patients with IED over 60) |
| Mortality rate | 4 deaths (in the case of the 1993 outbreak), 2 deaths (in the case of the 1999 outbreak), 10.9% (in the case of patients with IED over 60), 3-5% (in the case of patients with HUS) |
| Number of annual cases in the U.S. | 73,480 |
| Number of annual hospitalizations in the U.S. | 2,168 |
| Number of annual deaths in the U.S. | 61 |
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What You'll Learn
E. coli O157:H7 hospitalizations
E. coli O157:H7 is a strain of Escherichia coli (E. coli) bacteria that causes severe intestinal infections in humans. It was first identified in 1982 as the cause of bloody diarrhoea from consuming undercooked or raw hamburger meat contaminated with the bacteria. Since then, outbreaks have been linked to various foods, including spinach, lettuce, sprouts, unpasteurized milk, apple juice, apple cider, salami, and undercooked beef.
E. coli O157:H7 is the most commonly identified Shiga toxin-producing E. coli (STEC) serotype in the United States. It is a common cause of bloody diarrhoea and can lead to a severe complication called Hemolytic Uremic Syndrome (HUS), which involves kidney failure and is fatal in about 5-6% of cases. According to estimates, E. coli O157:H7 causes approximately 63,153 illnesses, 2,138 hospitalizations, and 20 deaths in the United States annually due to foodborne transmission alone. However, it is important to note that foodborne transmission is estimated to account for only 68% of infections, with other sources such as water, animal contact, and person-to-person contact contributing to the remaining cases.
The Centers for Disease Control and Prevention (CDC) reports about 70,000 cases of E. coli O157:H7 infections in the United States each year. Symptoms of E. coli O157:H7 infection typically appear two to five days after exposure and include severe diarrhoea (often bloody) and abdominal cramps. Most infected individuals do not experience fever or vomiting, and some may even be asymptomatic but still capable of transmitting the bacteria to others. In certain populations, such as children under five and the elderly, E. coli O157:H7 infections can lead to HUS, with about 2-7% of infections resulting in this complication.
Hospitalization in an intensive care unit may be required for individuals who develop HUS. Treatment for HUS may include blood transfusions and kidney dialysis. The CDC estimates that 3-5% of individuals who develop HUS may succumb to this complication. To prevent E. coli O157:H7 infections, the CDC recommends thorough cooking of ground beef, pork, lamb, and other meats. Additionally, it is crucial to ensure that cooked meats are brown or grey throughout, with clear juices, and that the inside is hot.
In summary, E. coli O157:H7 is a severe strain of E. coli that causes intestinal infections and is commonly associated with foodborne outbreaks. It is the most frequently identified STEC serotype in the United States and leads to a significant number of hospitalizations and deaths annually, particularly when it results in the development of HUS. Proper food handling and cooking practices are crucial in preventing E. coli O157:H7 infections and their associated complications.
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Shiga toxin-producing E. coli (STEC) hospitalizations
Shiga toxin-producing E. coli (STEC) is a strain of E. coli that releases Shiga toxins, damaging human cells. STEC infections usually cause severe illnesses, including kidney damage. According to sources, there are about 265,000 STEC infections in the US each year.
STEC infections are contracted by eating or drinking contaminated food or water or through contact with animals, environments, or other people. Infection most typically occurs by eating contaminated food, especially raw or undercooked meat. Other foods that can be contaminated with STEC include lettuce, alfalfa sprouts, salami, and raw (unpasteurized) milk, juice, or cider.
Symptoms of STEC infections include severe diarrhea, stomach cramps, and vomiting. Diarrhea is often bloody, and usually, there is little or no fever present. Symptoms typically appear 3-4 days after consuming or having direct contact with a contaminated product but can range from 1-10 days.
In some cases, particularly in children under five, STEC infections can lead to the development of hemolytic uremic syndrome (HUS), a serious, life-threatening disease causing blood clots and kidney damage or failure. Hospitalization is often required for STEC patients who develop HUS, as they may need blood transfusions, plasma exchange, or kidney dialysis. According to the CDC, 3-5% of persons who develop HUS may die from this complication.
Invasive extraintestinal pathogenic Escherichia coli disease (IED) is another severe form of E. coli infection that can lead to significant outcomes, especially among older adults. Hospital-onset IED results in a higher rate of ICU admissions and in-hospital fatalities compared to community-onset IED.
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Hospitalizations in older adults
Escherichia coli (E. coli) is a group of bacteria that can be found in the intestines of healthy humans and most warm-blooded animals. While E. coli is usually harmless, certain strains can cause infections in the gut (gastrointestinal tract), urinary tract, and other body parts. Infections can range from mild, self-limiting gastroenteritis to more severe illnesses like kidney damage, septic shock, and even death.
Older adults, particularly those over 60, are at an increased risk of severe outcomes from Invasive Extraintestinal Pathogenic E. coli Disease (IED). IED is caused by pathogenic E. coli strains that invade normally sterile sites in the body, such as the blood or urinary tract, leading to infections with potentially fatal complications. According to a study using the PINC AI™ Healthcare Database, 19,773 patients aged 60 and above with IED were hospitalized over a five-year period, with a mean age of 76.8 years and a high proportion of female patients (67.4%). The study also revealed a substantial clinical burden associated with IED, including a high rate of ICU admissions (32.4%), antibiotic resistance, and in-hospital deaths (10.9%).
Urinary tract infections (UTIs) caused by E. coli are a common reason for hospitalization in older adults. UTIs occur when E. coli bacteria ascend the urethra, and they are more prevalent in women due to the proximity of the urethra to the vagina and anus. Community-acquired pneumonia (CAP) caused by E. coli is another reason for hospitalization, especially in older adults with lower respiratory tract infections.
The management of E. coli infections in older adults can be complex due to the potential for antibiotic resistance. While antibiotics are not typically recommended for diarrheal illness caused by E. coli, they may be necessary in severe cases or when other complications arise. However, antibiotic resistance is a significant concern, and the high rate of resistance observed in studies underscores the need for increased IED awareness and prevention, especially in older adults.
Overall, while E. coli infections can vary in severity, older adults are at a heightened risk of adverse outcomes, including hospitalization, ICU admission, and death. The clinical burden of IED in this population highlights the importance of prevention, early detection, and effective treatment strategies to mitigate the impact of E. coli infections in older adults.
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Hospital-onset IED
Escherichia coli (or E. coli) is a group of bacteria that normally lives in the gut (gastrointestinal/GI tract) of healthy people and animals. While E. coli infections can cause everything from brief bouts of diarrhea to life-threatening illnesses, the type that lives in the GI tract usually does not cause harm. However, under certain circumstances, many strains of E. coli can cause illness.
The clinical burden of IED in the United States has not been extensively studied, but findings suggest the need for heightened awareness and prevention strategies. IED is associated with substantial consequences, and antibiotic treatment patterns indicate that the condition can be challenging to manage. A high rate of antibiotic resistance was observed, emphasizing the complexity of IED management.
Additionally, it is important to differentiate between the medical condition IED, which refers to invasive extraintestinal pathogenic Escherichia coli disease, and the acronym IED used to describe intermittent explosive disorder, a mental health condition characterized by uncontrolled aggressive outbursts. Intermittent explosive disorder is believed to affect approximately 2.7% of people in the United States and is more prevalent in younger individuals. It is often associated with other mental health conditions and influenced by genetic and environmental factors.
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Antibiotic treatment
Escherichia coli (E. coli) is a group of bacteria that normally lives in the gut (gastrointestinal/GI tract) of healthy people and animals. While the type that lives in the GI tract usually does not cause harm, there are harmful strains of E. coli that can cause digestive symptoms such as watery diarrhoea, stomach pain, and even bloody diarrhoea if ingested.
E. coli infections can cause everything from brief bouts of diarrhoea to life-threatening illnesses. Most people recover on their own without antibiotics, but some may require supportive care, such as supplemental fluids or nutrition. In more severe cases, hospitalization may be necessary to keep the infection from spreading.
Antibiotics are generally not recommended as the first-line treatment for diarrheal illness caused by E. coli due to harmful side effects and the development of antibiotic resistance. However, for patients with severe disease, including high fever, dehydration, prolonged diarrhoea, or bloody diarrhoea, antibiotics may be reasonable. The Infectious Diseases Society of America (IDSA) and the International Society of Travel Medicine (ISTM) recommend rifaximin, azithromycin, and ciprofloxacin to treat E. coli diarrheal illness.
For E. coli bacteremia, at least seven days of antibiotics are required, and the source of the bacteremia must be identified through clinical examination, imaging studies, and laboratory analysis. If a patient has a clinical syndrome that warrants antibiotic treatment for longer than seven days, the longer duration should be pursued.
It is important to note that antibiotics should not be used in Shiga toxin-producing E. coli (STEC) infections as they may lyse the bacteria, leading to the release of the toxin and an increased risk of hemolytic uremic syndrome (HUS). In addition, antidiarrheal medications, such as loperamide (Imodium), are not recommended for use in STEC infections as they can increase the chance of HUS.
The choice of antibiotic treatment for E. coli infections should be based on local antibiograms demonstrating susceptibility and resistance patterns. Extraintestinal infections caused by E. coli are generally susceptible to a variety of antibiotics, while intestinal illnesses may require a tailored approach due to the emergence of multidrug-resistant strains.
The clinical burden of invasive extraintestinal pathogenic E. coli disease (IED) in older adults in the United States has been substantial, with a high rate of antibiotic resistance observed. More than one in four patients in one study were treated with four or more agents during their index encounter. This highlights the complexity of managing IED and the need for increased awareness and prevention.
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Frequently asked questions
It is estimated that 2,168 hospitalizations occur each year in the United States due to E. coli O157 infections.
Symptoms of E. coli include watery or bloody diarrhea, stomach pain, and other digestive symptoms (gastroenteritis). Some strains of E. coli can also cause kidney damage.
Symptoms of E. coli can last anywhere from two days to two weeks, depending on the type of infection. Most people recover within five to ten days.
