Q.

Which of the following is NOT a primary cause of epidemics related to infectious diseases?

A. Lack of knowledge about disease transmission
B. Limited effectiveness of treatments in controlling disease spread
C. Mutation of disease-causing organisms
D. Availability of effective vaccines
Answer» D. Availability of effective vaccines
Explanation: The availability of effective vaccines is not a direct cause of epidemics. In fact, vaccines are crucial in preventing epidemics.
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