In a community based vaccine trial, which aims to compare the 1 year incidence of intussusception in children receiving/not receiving rotavirus vaccine, which of the following can be a likely exclusion criterion?
a) Children who may leave the study area within a month
b) Children aged 0 months to 24 months
c) Children without pre-existing intestinal anomalies
d) Children who have not received rotavirus vaccine previously
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Answer:
c is write ans
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