Twelve hazards that inspection programs are built around, from bacteria that survive refrigeration to parasites that survive everything except heat. For each one: where it comes from, how it reaches people, and what stops it.
Hazard reference
Prevention is specific. A control that works against one of these organisms can be useless against another, which is why hazard analysis starts by naming the agent rather than describing hygiene in general.
Colonizes the intestinal tract of poultry and can be present inside intact eggs, not only on the shell.
One of the few foodborne pathogens that grows at refrigeration temperature, which makes cold storage a delay rather than a control.
Carried by healthy cattle. The infectious dose is very low, and severe cases can progress to hemolytic uremic syndrome in children.
A leading bacterial cause of gastroenteritis worldwide, overwhelmingly associated with poultry.
Marine bacteria whose risk rises with water temperature, which makes warm-season shellfish a recurring concern.
Psychrotrophic: like Listeria, it tolerates cold storage. Most often associated with pork.
A spore former that survives cooking. The illness comes from what happens after the heat is turned off.
The hazard is a heat-stable toxin. Once it has formed, cooking the food again does not make it safe.
A zoonosis with two distinct exposure routes: unpasteurized dairy for consumers, and direct contact for workers.
A protozoan of particular concern in pregnancy and immunosuppression, where infection can be severe.
Largely controlled in commercial pork through feed and husbandry rules, but still present in wild game.
Tapeworms transmitted through undercooked beef and pork, and the classic reason carcass inspection exists.
Pregnant women, children, adults over 65, and anyone immunocompromised face a higher chance of severe illness from several of these agents, particularly Listeria, Toxoplasma, STEC and Vibrio.
For these groups the safest approach is avoidance rather than careful handling: no unpasteurized dairy, no raw or undercooked eggs, no raw shellfish, and no deli meats unless reheated until steaming.
What cuts across all of them
About the author
Veterinarian specializing in the inspection and control of animal-origin foods, with nearly 15 years of field experience in the poultry and egg industry. Author of three books on food safety and veterinary inspection, and a published researcher in the Journal of Agricultural Sciences Research. Member of AFDO and IAFP.
Professional inquiries
HACCP and GMP implementation, environmental monitoring programs, inspection consulting, technical training and research collaboration.
Send a messageGeneral guidance only. Not a substitute for medical care or regulatory advice. If you suspect a foodborne illness, seek medical attention and report the case to your local health department.
