A flu outbreak occurred in a military barracks that housed 20soldiers. Case A began on October 1 and case B was diagnosed onOctober 2. After approximately 10 days, 12 additional casesoccurred during approximately a one-week time span. Militaryepidemiologists believed that this second group of casesrepresented the same generation of cases, and was in the secondincubation period after the occurrence of cases A and B; none ofthe 20 soldiers was known to be immune. Describe attack rate andsecondary attack rate. Calculate the secondary attack rate usingthe foregoing data.
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