In order for herd immunity to be effective:
O Cattle must be immunized so that they can't pass diseases on to humans
O A certain percentage of the population must be immune
O The rate of subclinical infection must be low
O The incubation period should be shorter than 10 days
O Cattle must be immunized so that they can't pass diseases on to humans
O A certain percentage of the population must be immune
O The rate of subclinical infection must be low
O The incubation period should be shorter than 10 days