Diseases linked to animal-origin foods

Salmonella

Bacteria frequently associated with poultry, eggs, meat, and dairy.

• Common sources: Undercooked poultry/eggs, cross-contamination on boards/knives.
• Route: Ingestion of contaminated foods or surfaces (fecal–oral).
• Prevention: Cook poultry/eggs thoroughly, separate raw/ready foods, sanitize equipment.

Listeria monocytogenes

Hardy bacteria that survives and grows at refrigeration temperatures.

• Common sources: RTE meats, soft cheeses, cold smoked fish, chilled deli areas.
• Route: Post-process contamination; persistence in damp niches and drains.
• Prevention: Hygienic zoning, cold-room sanitation, strict temperature control.

Shiga-toxin producing E. coli (STEC)

Pathogenic E. coli strains producing Shiga toxin; severe illness risk.

• Common sources: Undercooked ground beef, raw milk, cross-contaminated produce.
• Route: Ingestion; contamination during slaughter/grinding or via fecal matter.
• Prevention: Cook ground beef to safe temps, pasteurize milk, avoid cross-contact.

Campylobacter

Leading bacterial cause of gastroenteritis, often linked to poultry.

• Common sources: Raw/undercooked chicken, raw milk.
• Route: Cross-contamination in kitchens; undercooking.
• Prevention: Thorough cooking, raw–ready separation, hand and surface hygiene.

Vibrio spp. (seafood)

Marine bacteria; risks rise with warm waters and raw shellfish.

• Common sources: Raw oysters and other undercooked seafood.
• Route: Contaminated harvest waters; inadequate cold chain.
• Prevention: Source controls, rapid chilling, cook shellfish thoroughly.

Yersinia enterocolitica

Psycrotrophic bacteria often associated with pork.

• Common sources: Pork products, chitterlings; post-cook contamination.
• Route: Fecal contamination; survival at low temps.
• Prevention: Cook pork thoroughly, avoid raw-ready contact, prompt chilling.

Clostridium perfringens

Spore-former associated with bulk-cooked meats held warm too long.

• Common sources: Roasts, stews, gravies at unsafe holding temps.
• Route: Spore survival → germination during slow cooling/warm holding.
• Prevention: Rapid cooling, reheat adequately, hot-hold above safe thresholds.

Staphylococcus aureus (enterotoxin)

Heat-stable toxin can form when foods are temperature-abused.

• Common sources: Meats, dairy, and deli items handled without hygiene.
• Route: Human carriers contaminate foods; toxin forms if time/temperature abused.
• Prevention: Hand hygiene, glove use, rapid cooling, safe holding temperatures.

Brucella spp. (Brucellosis)

Zoonosis linked to unpasteurized dairy and occupational exposure.

• Common sources: Raw milk/cheeses, infected livestock tissues.
• Route: Ingestion, inhalation, or mucosal contact in abattoirs/inspection.
• Prevention: Pasteurization, animal health programs, PPE for workers.

Toxoplasma gondii

Protozoan parasite; foodborne risk mainly via undercooked meat.

• Common sources: Undercooked lamb/pork/game; soil-contaminated produce.
• Route: Tissue cysts in meat; oocysts in environment (cats are definitive hosts).
• Prevention: Cook to safe temps, wash produce, hand hygiene after handling raw meat.

Trichinella spiralis

Nematode historically linked to pork and wild game.

• Common sources: Undercooked game meats; historically pork.
• Route: Ingestion of viable larvae in meat.
• Prevention: Cook thoroughly; follow validated times/temps for game meats.

Taenia spp. (tapeworms)

Cestodes transmitted via undercooked beef or pork.

• Common sources: Beef (T. saginata), pork (T. solium).
• Route: Ingestion of cysticerci in meat; poor slaughter hygiene.
• Prevention: Veterinary inspection, proper cooking, sanitation in slaughter/processing.