Foodborne Illness and Food Safety Hazards
What this domain covers
Foodborne illness and food safety hazards is the foundation domain. The exam checks whether you can name the main hazard types, explain how bacteria multiply, recognise high-risk foods, and identify the points where contamination can be controlled.
Core rules and concepts
- Hazards are biological (bacteria, viruses, parasites), chemical (pesticides, cleaning chemicals, mycotoxins) or physical (glass, metal, stones, hair).
- Bacteria need food, moisture, warmth, time and suitable acidity to multiply. The danger zone is about 5°C to 60°C; keep food out of it.
- High-risk foods include meat, poultry, seafood, eggs, dairy, cooked rice, beans and stews.
- Some illnesses come from toxins already formed in food. Reheating may kill bacteria but does not reliably destroy heat-stable toxins.
- Common symptoms are vomiting, diarrhoea, abdominal pain and fever; dehydration is a serious risk, especially for children.
Worked example
A large pot of rice is cooked at 6 p.m., left on the stove until 8 a.m., then reheated for lunch. The rice spent many hours in the danger zone, allowing Bacillus cereus to grow and form toxin. Reheating may reduce bacteria but does not reliably remove the toxin. The safe action is to cool rice quickly in shallow containers, refrigerate at 5°C or below, and reheat once to at least 74°C before hot holding.
Traps that cost marks
- Smell and taste are not safety tests.
- Freezing does not kill most bacteria; it only stops growth.
- Reheating does not destroy every toxin.
- “Fresh” or “local” food is not automatically low-risk.