AQA GCSE Biology
AQA GCSE Biology
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Topic 3: Infection and response
Topic 3: Infection and response
Bacterial diseases
Bacterial diseases
Salmonella
Salmonella
Infects: Humans
Symptoms: Fever, abdominal cramps, vomiting and diarrhoea are caused by the bacteria and the toxins they secrete.
Treatment/control: Plenty of fluids to prevent dehydration. In the UK, poultry are vaccinated against Salmonella to control the spread.
Spread by: Bacteria ingested in food, or on food prepared in unhygienic conditions
Gonorrhoea
Gonorrhoea
Infects: Humans
Symptoms: Thick yellow or green discharge from the vagina or penis and pain on urinating.
Treatment/control: Was easily treated with the antibiotic penicillin until many resistant strains appeared. Now treated with different antibiotics. Spread is controlled by the use of a barrier method of contraception such as a condom.
Spread by: Sexual contact.
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