GCSE Biology (OCR B)

Topic Summaries

Pathogens and non-specific immunity

Bacterial diseases

Disease Symptoms Transmission Details
Salmonella Fever, abdominal cramps, vomiting, and diarrhoea Ingesting spoiled or unhygienic food
  • Food poisoning
  • In the UK, poultry are vaccinated against salmonella to control spread
Gonorrhoea Thick yellow or green discharge from the vagina or penis and pain when urinating Sexual contact (STD)
  • Was easily treated with penicillin until many resistant strains appeared
  • Treated with antibiotics and prevented by using barrier method of contraception

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