Foodborne Illnesses: Types, Severity, and Causes

Foodborne illnesses, also known as food poisoning, are caused by consuming contaminated food or beverages. These illnesses can range from mild to severe and can cause a variety of symptoms, including nausea, vomiting, diarrhea, fever, and abdominal pain. In some cases, foodborne illnesses can even be fatal. In this article, we will explore the common causes of foodborne illnesses, the symptoms to look out for, and the steps you can take to prevent them.

Illnesses and Deaths

The exact number of people affected by foodborne illnesses each year can be difficult to determine, as many cases go unreported or undiagnosed. However, according to the World Health Organization (WHO), foodborne illnesses are a major public health problem worldwide, and it is estimated that as many as 600 million people fall ill each year after consuming contaminated food.

In the United States, the Centers for Disease Control and Prevention (CDC) estimates that each year, 1 in 6 Americans (or approximately 48 million people) become sick from a foodborne illness. Of these, approximately 128,000 are hospitalized and 3,000 die from their illness. However, as with global estimates, these numbers are likely an underestimate due to underreporting and undiagnosed cases.

It’s worth noting that some people are at higher risk of developing foodborne illnesses than others. As mentioned earlier, young children, elderly individuals, pregnant women, and people with weakened immune systems are all at increased risk of developing severe symptoms from a foodborne illness. Therefore, it’s especially important for these groups to take extra precautions to reduce their risk of foodborne illness.

The severity of symptoms from a foodborne illness can vary widely depending on the type of illness, the age and health status of the affected individual, and other factors. Some people may experience only mild symptoms that go away on their own, while others may become very ill and require hospitalization.

In general, the most common symptoms of foodborne illness include nausea, vomiting, diarrhea, abdominal pain, and fever. These symptoms can range from mild to severe, and may last for several days or even weeks.

Microbiology and Causes

There are many different types of microbiology that can cause foodborne illnesses. Here are some of the most common:

1. Bacteria: Bacteria are one of the most common causes of foodborne illness. Some common types of bacteria that can cause illness include Salmonella, E. coli, Campylobacter, and Listeria. These bacteria can be found in a wide range of foods, including meat, poultry, eggs, dairy products, and fresh produce.
2. Viruses: Viruses can also cause foodborne illness. Norovirus is one of the most common types of foodborne viruses, and is often associated with outbreaks in settings such as cruise ships or schools. Hepatitis A is another virus that can be transmitted through contaminated food.
3. Parasites: Parasites are less common causes of foodborne illness, but can still be a risk in some settings. Parasites such as Cryptosporidium, Giardia, and Toxoplasma can be found in contaminated water or food, and can cause illness in humans.
4. Fungi: Certain types of fungi can also cause foodborne illness. One example is aflatoxin, which can be produced by certain types of mold that can grow on peanuts, corn, and other crops.
5. Toxins: Toxins such as those produced by Staphylococcus aureus and Clostridium botulinum can cause foodborne illnesses. These toxins can be produced in food that is not stored or prepared properly. The danger behind toxins are that they can exist in food products which no longer have the bacteria present. For example, if food is cooked at certain temperatures which kill most bacteria and viruses the toxins may still remain in the meal.

It’s worth noting that not all types of microbiology are harmful to humans. In fact, many types of bacteria and other microbes are important for human health and can be found in foods such as yogurt, cheese, and fermented vegetables. However, when harmful microbes are present in food, they can cause illness and pose a risk to public health.

Stillbirth and Miscarriage

There are several serious foodborne illnesses that can cause severe symptoms and even be life-threatening. Here are a few examples:

1. Listeriosis: Listeriosis is a serious infection caused by the bacterium Listeria monocytogenes. It can cause symptoms such as fever, muscle aches, and gastrointestinal problems. In severe cases, it can lead to sepsis (a life-threatening condition in which the body’s immune system overreacts to an infection), meningitis (inflammation of the membranes surrounding the brain and spinal cord), and even death. Listeriosis can also cause miscarriage, stillbirth, or serious illness in newborns if a pregnant woman becomes infected.
2. Salmonellosis: Salmonellosis is caused by the bacterium Salmonella and can cause symptoms such as fever, diarrhea, and abdominal cramps. Most people recover without treatment, but in some cases, the infection can spread to the bloodstream and cause severe illness. Salmonellosis can also cause complications in pregnant women, such as premature delivery or stillbirth.
3. E. coli infection: Certain strains of the bacterium Escherichia coli (E. coli) can cause severe illness, including kidney failure and even death. Symptoms of E. coli infection can include abdominal pain, bloody diarrhea, and vomiting. E. coli infection can be especially dangerous for young children, elderly individuals, and people with weakened immune systems. Pregnant women can also be at risk of complications such as miscarriage or stillbirth.
4. Toxoplasmosis: Toxoplasmosis is a parasitic infection caused by the protozoan Toxoplasma gondii. It can cause flu-like symptoms such as fever and muscle aches, but most people do not experience any symptoms. However, toxoplasmosis can be dangerous for pregnant women, as the infection can be passed to the developing fetus and cause serious complications such as blindness, deafness, and intellectual disability.

It’s worth noting that not all foodborne illnesses can cause loss of birth, but certain types of infections can be especially dangerous for pregnant women and their developing fetuses. Therefore, it’s important for pregnant women to take extra precautions to avoid foodborne illness, such as washing their hands frequently and avoiding high-risk foods like undercooked meat and unpasteurized dairy products.

E Coli 0157:H7

E. coli O157:H7 is a strain of the E. coli bacterium that can cause severe illness in humans. It is often associated with undercooked beef, raw milk, and contaminated produce such as spinach and lettuce. The symptoms of E. coli O157:H7 infection can include severe stomach cramps, diarrhea (often bloody), and vomiting. In some cases, the infection can progress to a serious complication known as hemolytic uremic syndrome (HUS), which can cause kidney failure and even death.

E. coli O157:H7 infection can be particularly dangerous for young children, elderly individuals, and people with weakened immune systems. It can also be a concern for pregnant women, as the infection can lead to serious complications such as miscarriage or stillbirth.

Preventing E. coli O157:H7 infection involves taking precautions to ensure that food is cooked and handled safely. For example, it’s important to cook ground beef to an internal temperature of 165°F and to thoroughly wash hands, cutting boards, and utensils after handling raw meat. It’s also important to avoid cross-contamination by keeping raw meat separate from other foods and avoiding unpasteurized dairy products and juices.

If you think you may have been infected with E. coli O157:H7, it’s important to seek medical attention. In some cases, antibiotics may be used to treat the infection, although they are not always effective and may even increase the risk of HUS. Therefore, it’s important to work closely with a healthcare provider to manage the symptoms and complications of the infection.

Hemolytic uremic syndrome (HUS) is a serious complication that can occur in some people who are infected with certain strains of bacteria, including E. coli O157:H7. HUS is a type of kidney failure that can be life-threatening, especially in children and older adults.

HUS occurs when the E. coli bacteria produce toxins that can damage the lining of small blood vessels, leading to the formation of blood clots. These blood clots can block the flow of blood to the kidneys and other organs, leading to kidney failure, anemia, and low platelet count (thrombocytopenia).

The symptoms of HUS can include fatigue, weakness, paleness, decreased urine output, and swollen limbs or abdomen. In severe cases, it can cause seizures, stroke, and even death. Treatment for HUS typically involves hospitalization and supportive care, such as intravenous fluids, blood transfusions, and dialysis.

To prevent HUS, it’s important to take precautions to avoid getting infected with E. coli bacteria in the first place. This includes practicing good hygiene, thoroughly washing hands and food, cooking food to safe temperatures, avoiding cross-contamination, and avoiding unpasteurized dairy products and juices. If you suspect you may have an E. coli infection, seek medical attention right away to prevent the development of HUS.

Symptoms of Foodborne Illnesses

The symptoms of foodborne illnesses can vary depending on the type of bacteria, virus, parasite, or toxin that is causing the illness. Some of the most common symptoms include:

1. Nausea and vomiting: These symptoms are common in many types of food-borne illnesses, and may be accompanied by abdominal pain or cramps.
2. Diarrhea: Diarrhea is another common symptom of foodborne illnesses, and can be severe in some cases.
3. Fever: A fever may develop in response to a food-borne illness, particularly if it is caused by a bacterial or viral infection.
4. Dehydration: Dehydration can occur as a result of diarrhea and vomiting, particularly in young children, the elderly, and those with weakened immune systems.
5. Other symptoms: Other symptoms of foodborne illnesses may include fatigue, muscle aches, miscarriage, stillbirth, abdominal pain and cramping, loss of appetite, weight loss, and headaches.

These symptoms can range from mild to severe, and may last for a few hours to several days. In some cases, foodborne illnesses can lead to more serious complications, such as kidney failure, neurological damage, and even death.

It’s important to seek medical attention if you experience any of these symptoms after consuming food, especially if you are experiencing severe symptoms or have an underlying medical condition that increases your risk of complications.

Incubation Times

The incubation time for a foodborne illness refers to the period between when a person consumes contaminated food and when they begin to experience symptoms. The incubation time can vary depending on the type of microbe responsible for the illness, as well as factors such as the amount of contaminated food consumed and the person’s overall health. Here are some common foodborne illnesses and their typical incubation times:

1. Norovirus: 12-48 hours
2. Salmonella: 6-72 hours
3. E. coli O157:H7: 1-10 days
4. Listeria: 1-4 weeks
5. Campylobacter: 2-5 days
6. Hepatitis A: 15-50 days
7. Vibrio: 1-7 days
8. Shigella: 1-7 days

It’s important to note that these are only typical incubation times, and some people may experience symptoms sooner or later than these timeframes. Additionally, some types of foodborne illness may have longer or shorter incubation periods, or may not cause symptoms for weeks or even months after the initial infection. If you suspect that you have a foodborne illness, it’s important to seek medical attention to determine the cause and receive appropriate treatment.

Preventing Foodborne Illnesses

Fortunately, there are several steps you can take to prevent foodborne illnesses. Here are some tips to keep in mind:

1. Wash your hands: Washing your hands before and after handling food can help prevent the spread of bacteria and viruses. Use warm, soapy water and wash for at least 15 to 20 seconds. Many other aspects regarding washing hands are also a huge factor. Anytime raw meat is handled the next step before continuing preparation or processing should include washing hands. Gloves are also quite an issue as some individuals believe using gloves means never washing your hands. However, contamination can easily occur when removing the gloves and handling the new pair will still include residues. Hand washing should be treated the same with every glove removal washing hands prior to putting the next pair on.
2. Cook food thoroughly: Cooking food to the appropriate temperature can help kill bacteria and other pathogens. Use a meat thermometer to ensure that meat, poultry, and seafood are cooked to the appropriate temperature. Every type of meat needs to be cooked to different temperatures. Whole meat products such as eggs, seafood, steak, lamb, or pork should reach and internal temperature of 145°F. Ground meat like burger patties and injected meats should reach an internal temperature of 155°F. Poultry such as turkey and chicken should always reach an internal temperature of 165°F.
3. Store food properly: Storing food at the appropriate temperature can help prevent the growth of bacteria and other pathogens. Keep hot foods hot and cold foods cold, and use refrigerated or frozen foods within their expiration dates. Cold food should always be kept at or below 41°F and hot food should be maintained at or above 135°F. Food preparation should always be managed with small batches as some cooks may leave out meat at room temperature for hours causing a potential for bacteria build-up.
4. Cooling: Cooling can be a major issue as many restaurants cook in large batches and many times the large batches are improperly cooled. For example, a giant pot of beans or rice gets put in the refrigerator and the outside temperature may cool to 41°F. However, the internal temperature can remain quite warm which provides a breeding ground for many different types of bacteria. The food may be cooked properly in this case, yet the cooling can still allow colonies of microorganisms to get you sick. Hot food which is cooked should always go from 135°F to 70°F within a two hour period. Then within the next four hours should go from 70°F to 41°F.
5. Avoid cross-contamination: Cross-contamination can occur when bacteria from raw meat or poultry comes into contact with other foods. Use separate cutting boards and utensils for raw meat and other foods, and wash your hands and surfaces thoroughly after handling raw meat.
6. Be mindful of high-risk foods: Some foods are more likely to be contaminated with harmful bacteria or viruses than others. Be especially careful when handling raw or undercooked meat, poultry, seafood, eggs, and dairy products.
7. Wash produce: Rinse fresh fruits and vegetables thoroughly before eating or cooking them. This can help remove any bacteria or parasites that may be present. Nematodes and bacteria may still be present on raw vegetables and produce as they are originally from the ground. Using this simple step can save you a lot of hardship and pain which will occur after getting a foodborne illness.
8. Practice good hygiene: Avoid preparing food for others if you are sick, and wash your hands frequently. If you have been diagnosed with a foodborne illness, stay home until you are fully recovered. Allow up to 48 hours after symptoms resolve to finally handle food as this is a great time range to ensure you no longer have the illness. For example, Norovirus is highly contagious and can easily be spread to others through food if it’s handled while you have the illness.
9. Be cautious when eating out: When eating out, be sure to choose reputable restaurants that practice good hygiene and food safety measures. Avoid buffets, salad bars, and other self-serve food options. Heavily avoid eating at pop up stands on the street or other street vendors as their products may not meet the correct standards. For example, it is unknown from many of these stands where the food comes from, if it’s properly stored, how they wash their hands at the location on the street, if they cross-contaminate, and whether the food is being properly cooked. Many restaurants, mobile food facilities, and temporary food facilities at events are often inspected by the environmental health departments. This allows a watchful eye to keep the public safe and hold them accountable. At pop up stands if a foodborne illness causes death or illness there may be no recourse to save other people’s lives.
10. Thawing: All frozen food should be thawed in a variety of different ways. It can be thawed using cold running water at the food preparation sink, thawing it as part of the cooking process, thawing frozen food using refrigeration at 41°F, or simply using a microwave. The main reason is that over the time of thawing the potentially hazardous food which is left unattended may stay in the danger zone of 41°F to 135°F

Recovery

Recovering from a foodborne illness depends on the type and severity of the illness. In most cases, mild foodborne illnesses can be treated with rest and hydration, and symptoms typically subside within a few days to a week. More serious illnesses may require hospitalization or medical treatment to manage symptoms and prevent complications.

If you have a foodborne illness, it’s important to stay hydrated by drinking plenty of fluids, such as water or clear broth. You may also find it helpful to eat small, frequent meals of bland foods such as rice, toast, or bananas. Avoid foods that are high in fat, sugar, or fiber, as these can be hard to digest and may aggravate your symptoms.

In some cases, your healthcare provider may prescribe medication to manage your symptoms or prevent complications. For example, antibiotics may be used to treat certain types of bacterial infections, while anti-nausea medication may be used to manage vomiting.

It’s important to continue monitoring your symptoms and seeking medical attention if they worsen or do not improve. In some cases, foodborne illnesses can lead to long-term health problems, such as chronic kidney disease or irritable bowel syndrome.

To prevent future foodborne illnesses, it’s important to practice safe food handling and preparation techniques, such as washing hands and surfaces frequently, cooking food to safe temperatures, avoiding cross-contamination, and following proper food storage guidelines.

Common Foodborne Illnesses

There are many different types of bacteria, viruses, and parasites that can cause foodborne illness. Here are some of the most common ones:

1. Norovirus: This highly contagious virus is responsible for many cases of food poisoning, especially in group settings such as cruise ships and schools.
2. Salmonella: This bacteria is found in a wide variety of foods, including raw poultry and eggs, and can cause symptoms such as diarrhea, fever, and abdominal cramps.
3. E. coli: Certain strains of this bacteria can produce toxins that cause severe foodborne illness, including bloody diarrhea and kidney failure. It’s often associated with undercooked ground beef and contaminated produce.
4. Listeria: This bacteria can be found in deli meats, soft cheeses, and other refrigerated foods, and can cause a serious illness called listeriosis, which can be especially dangerous for pregnant women and people with weakened immune systems.
5. Campylobacter: This bacteria is commonly found in raw poultry and can cause symptoms such as diarrhea, fever, and abdominal cramps.
6. Hepatitis A: This virus can be transmitted through contaminated food and water, and can cause a liver infection that leads to symptoms such as jaundice, fatigue, and abdominal pain.
7. Vibrio: This bacteria is commonly found in raw or undercooked seafood, and can cause symptoms such as diarrhea, vomiting, and fever.
8. Shigella: This bacteria is found in contaminated food and water, and can cause a diarrheal illness known as shigellosis.

It’s important to note that this list is not comprehensive, and there are many other types of bacteria, viruses, and parasites that can cause foodborne illness. Additionally, the specific types of foodborne illness that are most common can vary depending on factors such as geography, season, and food consumption habits.

FAT TOM

Potentially hazardous foods (PHFs) are defined as foods that require time-temperature control to prevent the growth of pathogenic microorganisms or the production of toxins. PHFs are considered high-risk because they have a high protein and moisture content, which provides a suitable environment for the growth of bacteria and other pathogens. They also typically have a neutral pH, which allows bacteria to multiply rapidly. Examples of PHFs include raw or undercooked meat, poultry, and seafood, cooked rice, pasta, and other grains, dairy products, cut fruits and vegetables, and foods containing eggs or mayonnaise.

FAT TOM is an acronym commonly used in the food industry to remember the six conditions that promote the growth of bacteria in food. The six conditions are:

1. Food – Bacteria need nutrients to grow, so any food or ingredient that contains protein, carbohydrates, and/or fat can provide a suitable environment for bacterial growth.
2. Acidity – Bacteria grow best in a neutral pH environment (around 7.0), but some bacteria can thrive in acidic conditions as well.
3. Temperature – Bacteria grow best at temperatures between 41°F (5°C) and 135°F (57°C), known as the “danger zone”. Keeping food out of the danger zone is important to prevent bacterial growth.
4. Time – The longer food is kept in the danger zone, the more time bacteria have to grow and multiply.
5. Oxygen – Some bacteria need oxygen to grow, while others can grow in the absence of oxygen (known as anaerobic bacteria).
6. Moisture – Bacteria need moisture to grow and reproduce. Foods that are moist or high in water activity provide a suitable environment for bacterial growth.

By remembering the conditions of FAT TOM, food industry professionals can take steps to prevent or control bacterial growth in food. For example, they may use refrigeration, acidity, and packaging techniques to keep food out of the danger zone, or use sanitation and hygiene practices to prevent cross-contamination and reduce bacterial contamination.

Cooking and Safety

Cooking is a critical step in preventing foodborne illness, as it can kill most bacteria and viruses that may be present in food. However, cooking alone is not always enough to keep food safe, as there are several other factors that can contribute to the growth of harmful bacteria and other pathogens.

For example, if food is not handled properly before it is cooked, it may become contaminated with bacteria that can survive the cooking process. Cross-contamination can occur when bacteria from raw meat, poultry, or seafood comes into contact with other foods, surfaces, or utensils in the kitchen. This can happen when cutting boards, knives, or other tools are not properly cleaned and sanitized between uses.

In addition, some bacteria can produce toxins that are not destroyed by cooking, so even if the bacteria are killed, the toxins may still be present in the food and can cause foodborne illness.

Furthermore, cooking may not be enough to make certain types of food safe. For example, some types of seafood may contain harmful bacteria, viruses, or parasites that can only be killed by freezing or cooking to very high temperatures. In these cases, cooking alone may not be adequate to ensure that the food is safe to eat.

Therefore, it is important to follow safe food handling practices, including washing hands and surfaces, avoiding cross-contamination, and properly storing and cooking food to prevent the growth of harmful bacteria and reduce the risk of foodborne illness.

Conclusion

Foodborne illnesses are a common and serious problem that can be caused by a variety of factors, including bacteria, viruses, parasites, and toxins. The symptoms of foodborne illnesses can range from mild to severe, and can be particularly dangerous for young children, the elderly, and those with weakened immune systems. Fortunately, there are several steps you can take to prevent foodborne illnesses, including washing your hands, cooking food thoroughly, storing food properly, and practicing good hygiene. By taking these simple precautions, you can help protect yourself and your family from food-borne illnesses and enjoy your meals with peace of mind.