Foodborne Illness Quiz: Which Is NOT Foodborne?

Question: Which of the following is not a foodborne illness?

• a. Listeriosis
• b. Salmonellosis
• c. Influenza
• d. E. coli infection

Answer: c. Influenza.

Explanation

• Influenza is a respiratory illness caused by influenza viruses. Transmission: respiratory droplets, aerosols, fomites—not food.
• Listeriosis (Listeria monocytogenes): Contaminated deli meats, soft cheeses, produce. High risk: pregnant, elderly, immunocompromised.
• Salmonellosis (Salmonella spp.): Eggs, poultry, produce, peanut butter. Causes gastroenteritis; can be invasive.
• E. coli infection (STEC O157:H7 etc.): Undercooked beef, raw milk, produce, water. Causes bloody diarrhea, HUS risk.

Key Distinction

Foodborne pathogens: bacteria, viruses (norovirus, hepatitis A), parasites transmitted via ingestion of contaminated food/water. Influenza is not in this category.