A herd of cattle is showing fever, nasal discharge and swollen lymph nodes. Laboratory analysis confirms infection with a viral disease that has an incubation period of 5-7 days and a mortality rate of 30 % if untreated. A vaccine against the disease provides protective immunity two weeks after the first dose, and a booster given four weeks after the first dose extends immunity for the rest of the year. An outbreak is forecast to occur in six weeks. Propose the optimal vaccination schedule (timing of the first dose and booster) that will ensure the herd is protected before the outbreak.

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First dose 4 weeks before the outbreak, booster 2 weeks before the outbreak

Waec Model Questions Vol1 2024 Agricultural Science Question 38

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