Public Health, Zoonoses, Meat and Milk Hygiene
Public health, zoonoses, meat and milk hygiene tests how animal products and contact with animals affect human health. The exam often asks which control measure breaks transmission or which lesion condemns a carcass.
Core rules
- Zoonoses: rabies, brucellosis, tuberculosis, anthrax, leptospirosis, salmonellosis, cysticercosis and hydatidosis. Control combines animal vaccination, pasteurisation, hygiene and surveillance.
- Milk: pasteurisation HTST about 72°C for 15 seconds; UHT about 135°C for 1–2 seconds; cooling after milking slows bacterial growth. Mastitis milk is abnormal and should not enter the bulk tank.
- Meat inspection: examine lymph nodes, viscera and musculature; condemn generalised tuberculosis, anthrax, rabies and severe septicaemia. Do not open anthrax suspects.
- HACCP identifies hazards and critical control points; it is preventive, not end-product testing alone.
- Personal hygiene, potable water and pest control are basic safeguards.
Worked example
A village reports fever and joint pain after drinking raw milk from a goat herd; Brucella is suspected. Reasoning: Brucella is shed in milk and causes undulant fever in people. Boiling or pasteurising milk breaks the milkborne route; test and cull infected animals; protect workers with gloves. Giving antibiotics to the household without medical advice would not address the source.
Traps
Do not say all zoonoses are treated with antibiotics-rabies and viral diseases are not. Do not treat pasteurisation as sterilisation. Do not pass a carcass with generalised TB lesions. Do not confuse meat inspection with HACCP.