Food Poisoning: Symptoms and Prevention — Take Extra Care in Summer

Food poisoning is a common but preventable health problem caused by contamination of food with harmful microorganisms. These pathogens include certain viruses, bacteria, and parasites and generally cause digestive symptoms involving the stomach and intestines. Summer heat provides conditions in which harmful microorganisms multiply more easily, so food poisoning is more frequent in warm seasons and sometimes occurs in outbreaks. Contamination can arise during food production, transportation, or storage.

Which Pathogens Most Commonly Cause Food Poisoning?

1. Escherichia coli (E. coli)

E. coli bacteria, also known as coliform bacilli, are among the most important causes of food poisoning and summer diarrhea. There are many subtypes, and they are members of our normal intestinal flora. Because E. coli normally lives in the intestine, its presence in environmental water indicates fecal contamination. Some types cause illness when transmitted to humans. As a gram-negative bacterium, E. coli does not form endospores, so pasteurization or boiling kills it. Adapted to growing in mammalian intestines, it multiplies best at body temperature.

Infection-causing types may be transmitted through food, water, or contact with other people.

Symptoms Appearing Within 3 - 4 Days:

• Diarrhea
• Bloody diarrhea
• Fever
• Dehydration
• Abdominal cramps
• Urinary tract infection
• Respiratory tract infection

2. Norovirus

Norovirus is transmitted through fecally contaminated food or water and contact with infected people or contaminated surfaces. It is common in many countries worldwide. Transmission frequently occurs in hotels, through food sold outdoors, restaurants, and entertainment venues.

Symptoms Appearing Within 24 - 48 Hours of Norovirus Infection:

• Nausea
• Vomiting
• Fever
• Headache
• Stomach pain
• Extreme weakness
• Body and muscle aches

Recovery varies according to the person’s resilience. Hospital assessment and treatment may be needed. More resilient individuals may recover by drinking plenty of fluids and resting.

3. Salmonella (Nontyphoidal)

Salmonella is an important cause of bacterial diarrhea. Research suggests that it causes approximately 94 million cases of food poisoning annually, resulting in 115.000 deaths. It spreads through inadequately disinfected water, food, or contact with infected people or animals.

Symptoms Appear Within 6-72 Hours of Salmonella Infection:

• Fever 
• Abdominal pain

Recovery may occur within 4 to 7 days with plenty of fluids and adequate rest. Hospital treatment should be provided if necessary.

4. Clostridium perfringes

Clostridium perfringens is a bacterium that adversely affects human and animal intestines. It is not transmitted by person-to-person contact. It is mainly found in raw meat and poultry. It spreads when cooked meat products are kept warm before serving.

Symptoms Appear Quickly and Usually Resolve Within 24 Hours:

• Diarrhea
• Abdominal pain

Drink plenty of fluids and rest at home.

5. Campylobacter Species

Campylobacter species cause inflammation of the stomach and small intestine. They are found in the intestines of warm-blooded animals, especially cattle and poultry, and spread through consumption of meat and chicken products or direct contact with infected animals.

Symptoms Appearing Within 1 - 10 Days of Campylobacter Infection:

• Diarrhea
• Vomiting
• Nausea
• Abdominal pain or cramps
• Fever
• Headache
• Fatigue
• Dehydration

The immune system can be severely affected. Medical treatment may be needed if symptoms persist despite fluids and rest.

6. Parasites

Parasites are transmitted through contaminated or spoiled food. Poisoning generally results when fecally contaminated water contacts raw meat, fish, or vegetables that are then consumed.

Symptoms Vary According to the Parasite:

• Digestive system symptoms
• Cough
• Skin lesions
• Nervous system problems

7. Listeria monocytogenes

Food poisoning from listeriosis, caused by Listeria monocytogenes infection, generally seriously affects health and requires immediate hospital assessment. Severity varies with immune function, and the infection is most common in infants, pregnant women, and older adults.

Symptoms Appearing Within 1 to 4 Hours of Listeria Infection:

• Fever
• Muscle pain
• Loss of balance
• Muscle stiffness, especially in the neck
• Convulsions

Pregnant women with fever or flu-like symptoms may need urgent medical intervention.

How to Prevent Food Poisoning

• Maintain personal hygiene and wash hands frequently. Do not bite your nails or eat before washing your hands. We do not recommend antibacterial soaps because they offer no additional protection and disrupt the skin flora. Ordinary soap is sufficient for hand hygiene.
• Food cleanliness is very important. Wash fruits and vegetables thoroughly, especially when they will be eaten raw.
• Cook animal products such as meat, chicken, and fish thoroughly, and buy them from reliable sources.
• Choose frozen products carefully. Food poisoning also frequently occurs through frozen foods.
• Keep the preparation area clean. Do not perform cleaning tasks involving toilets, cat litter, or dog feces while preparing food.
• When reheating food, keep it at cooking temperature.
• After contact with animals in places such as villages, farms, or zoos, always wash hands thoroughly with soap and water.

In conclusion, food poisoning occurs more often during the summer holiday season. Its risk is generally lower with home-prepared food, so take care when choosing food away from home, favoring well-cooked dishes over raw vegetables, for example. Personal and environmental cleanliness also provide substantial protection. If you suspect food poisoning because of the signs and symptoms described above, avoid physical contact with others and preparing food for them, and see your doctor as soon as possible.