2021HSCShort answer

Q21 (c)

3 marks

Question

Two pig farmers on neighbouring farms noticed that their pigs were suffering from diarrhoea and gradually losing weight. The farmers each adopted a different strategy to deal with this disease, as shown in the table. Outline ONE benefit and ONE limitation of the strategies used on each farm.

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Solution

Farm 1: A benefit is that antibiotics acted quickly, with all pigs recovering within two weeks. A limitation is that prolonged use may select for antibiotic-resistant bacteria, making the treatment less effective.

Farm 2: A benefit is that removing rats and mice improves hygiene and may prevent future outbreaks. A limitation is that this strategy acted slowly, taking three months to reduce the number of sick animals.

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Syllabus alignment

Working ScientificallyModule 7 · Infectious Disease

Prevention, Treatment and ControlEvaluate environmental management and quarantine during epidemics or pandemics.
Prevention, Treatment and ControlAssess antivirals and antibiotics as infectious-disease treatment strategies.

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