1. BIOLOGICAL- Pathogens are the Greatest Threat to Food Safety. Include: VIRUSES, PARASITES, FUNGI, and BACTERIA. Ex: Some plants, mushrooms, and seafood carry harmfull toxins(poisons).
2. CHEMICAL- Foodservice chemicals can contaminate food. Ex: cleaners, sanitizers, and polishers
3. PHYSICAL- Foreign Objects such as Metal Shavings, Staples, and Bandages, Glass, Dirt, and even Bag Ties can get into food.
Naturally Occurring Objects such as Fish Bones in Fillets are also Physical Contaminents.