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In an outbreak of varicella (chickenpox) in Oregon in 2002, varicella was diagnosed in 18 of 152 vaccinated children compared with 3 of 7 unvaccinated

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In an outbreak of varicella (chickenpox) in Oregon in 2002, varicella was diagnosed in 18 of 152 vaccinated children compared with 3 of 7 unvaccinated children. a. Calculate the risk ratio (relative risk) of getting chickenpox comparing vaccinated and unvaccinated children. (Show your calculations for full credit) b. Interpret the results

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