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Social & Preventive Medicine General 01b5c207

During investigation of an epidemic, the area is declared free of epidemic when?

A
Twice the incubation period of the disease since occurrence of the last case
B
Thrice the incubation period of the disease since occurrence of the last case
C
The longest incubation period for the disease
D
Incubation period for the disease plus two standard detions
High-Yield Explanation
No explanation provided.

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