Salmonella and gonorrhoea: route-specific control
| English | Français |
|---|---|
| Salmonella/ˌsælməʊˈnelə/ | Salmonella |
| antibiotic resistance/ˌæntɪbaɪˈɒtɪk rɪˈzɪstəns/ | antibiotic resistance |
What would explain this observation?
- Both named diseases are bacterial, but a food-handling control does not interrupt every route. Explain why the preventive measure fits the particular pathogen.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Salmonella 沙门氏菌 food poisoning follows ingestion of bacteria in contaminated food, including food prepared unhygienically. Bacteria and their toxins can cause fever, abdominal cramps, vomiting and diarrhoea. The specification identifies vaccination of poultry in the UK as a control. Gonorrhoea is a sexually transmitted bacterial disease that can cause thick yellow or green discharge and pain when urinating.
- Salmonella: Bacteria that can cause food poisoning after ingestion; antibiotic resistance 抗生素耐药性: The ability of bacteria to survive an antibiotic that would kill or inhibit susceptible bacteria.
Which measure directly reduces the specified sexual transmission route?
Gonorrhoea spreads through sexual contact. Barrier contraception such as condoms reduces transmission risk, while appropriate antibiotic treatment targets the bacteria. Some strains are resistant to antibiotics; the historical use of penicillin does not imply that it will now treat every strain. A named symptom alone cannot prove which organism caused it.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Gonorrhoea spreads through sexual contact. Barrier contraception such as condoms reduces transmission risk, while appropriate antibiotic treatment targets the bacteria. Some strains are resistant to antibiotics; the historical use of penicillin does not imply that it will now treat every strain. A named symptom alone cannot prove which organism caused it.
- Analyse fictional food-chain and contact-route diagrams. Place each control at the point where it interrupts transmission: prevent contamination, prevent transfer or treat infection under professional care. Compare denominators when evaluating model control data. Do not use actual infected material or ask students to disclose sexual or medical histories.
Which two habits make the investigation or model in this case more defensible?
Analyse fictional food-chain and contact-route diagrams. Place each control at the point where it interrupts transmission: prevent contamination, prevent transfer or treat infection under professional care. Compare denominators when evaluating model control data. Do not use actual infected material or ask students to disclose sexual or medical histories.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: fictional food models have 9 contaminated samples among 150 before a control and 3 among 150 after it. Rates are 6% and 2%; the decrease is 4 percentage points, or a 66.7% relative decrease. Matching counts and denominators helps comparison, but other changes could explain the result.
A fictional sample has 4 contaminated items among 200. Calculate the percentage. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A fictional sample has 4 contaminated items among 200. Calculate the percentage.
The result is 2 %. Known: fictional food models have 9 contaminated samples among 150 before a control and 3 among 150 after it. Rates are 6% and 2%; the decrease is 4 percentage points, or a 66.7% relative decrease. Matching counts and denominators helps comparison, but other changes could explain the result.
Check the conclusion and its limits
- Resistance belongs to the bacterial population, not a person becoming resistant to a medicine. Food hygiene and barrier contraception address different routes. Treatment choices require current clinical guidance; this lesson teaches the specified mechanisms rather than recommending a particular drug.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Antibiotic resistance means a person becomes resistant to the antibiotic. This claim is false: Resistance belongs to the bacterial population, not a person becoming resistant to a medicine. Food hygiene and barrier contraception address different routes. Treatment choices require current clinical guidance; this lesson teaches the specified mechanisms rather than recommending a particular drug.
Salmonella and gonorrhoea: route-specific control: Gonorrhoea spreads through sexual contact. Barrier contraception such as condoms reduces transmission risk, while appropriate antibiotic treatment targets the bacteria. Some strains are resistant to antibiotics; the historical use of penicillin does not imply that it will now treat every strain. A named symptom alone cannot prove which organism caused it.
Antibiotic resistance means a person becomes resistant to the antibiotic.
Resistance belongs to the bacterial population, not a person becoming resistant to a medicine. Food hygiene and barrier contraception address different routes. Treatment choices require current clinical guidance; this lesson teaches the specified mechanisms rather than recommending a particular drug.
Bacteria that can cause food poisoning after ingestion: write the technical term.
Salmonella means Bacteria that can cause food poisoning after ingestion.