Two directly transmitted viral diseases have the same critical immunization threshold (p.) even though their effects on the host are different. Which of the following differences between the two diseases could lead to the same critical immunization threshold? a) One disease has a higher transmission rate and a longer recovery period than the other b) One disease has a lower transmission rate and a longer recovery period than the other c) One disease has a lower transmission rate and a shorter recovery period than the other. d) For one disease, the recovery period is long; for the other, no one recovers

Option B

Explanation:

Critical immunization can be defined as the minimum proportion which has to be immunized at the birth in order for the infection to die out of the population.

The critical immunization of two disease is possible only when one disease has lower transmission rate and the other has longer recovery period.

So if a disease A has lower transmission rate and other disease B has a longer recovery rate.

In this case the critical immunization would be same in order to save the population from being affected.

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