Salmonella bacteria can pass from chickens to humans in food and cause food poisoning. Chickens on a farm are vaccinated against Salmonella. How does this reduce food poisoning in humans?
Antibodies made by the vaccinated chickens are passed to humans in the meat
The vaccine kills the Salmonella bacteria already present in the chicken meat
Humans who eat meat from the vaccinated chickens become immune to Salmonella
Fewer chickens carry Salmonella, so less Salmonella enters the human food chain
176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.