The area is declared free of epidemic:: (A) Till last secondary case recovers, (B) No new case repoed for the incubation period of disease since the last case, (C) No new case repoed for twice the incubation period of disease since the last case, (D) No new case repoed for six months since the last case
Answer is C. Epidemic: Number of cases of a disease clearly in excess of normal frequency. An area is declared free of epidemic; if on search , no new cases are repoed for 'twice the incubation period of the disease since the occurrence of last case'.