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A researcher investigating the occurrence of influenza enrolled 200 subjects into his study on January 1, 2011 and followed them…

A researcher investigating the occurrence of influenza enrolled 200 subjects into his study on January 1, 2011 and followed them up for 12 months. A total of 50 subjects were found to be vaccinated for the disease at study entry. By September 30th, 2011, 30 subjects developed influenza. Between October and December, 60 more subjects […]