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True prevalence: 50% simulation envelope over 10 simulated years for the tested scenarios in the low-hygiene herd. (A) “Three control actions” means the three control actions in (B). “Four control actions” means the three actions in (B) plus test-and-cull. (B) “Handle waste milk” and “handle colostrum” means that the farmer only uses milk or colostrum from test-negative cows for feeding calves.
