Criteria for defining polio epidemic are all except ?
Correct Answer: Cases occurring during 6 month period
Description: Ans. is 'd' i.e., Cases occuring during 6 month period o An epidemic of polio is defined as 2 or more local cases caused by same virus type in any 4 week period. So, it has following features - i) 2 or more cases of polio ii) Caused by same virus type iii) Within 4 week period
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