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What is In a village of 100 children, 60% are immunized against measles. One child travelled outside and returned with measles and infected other 26 children. What is the secondary attack rate and explain in detail?
Ans. is 'a', i.e 67% Secondary attack rate : No. of exposed persons developing the disease within the range of incubation period following exposure to the primary case. SAR = (No. of exposed persons developing the disease within the range of incubation period) x 100 / (Total no. of exposed/susceptible contacts)Total no. of children = 100Total no. of immunize = 60No. of susceptible = 39Since out of 40 unimmunized children one has already contacted the disease.No. of exposed persons developing the disease = 26So SAR= (26 / 39 ) x 100 =200/3 = 67%