Secondary attack rate of chicken pox is around:: (A) 60%, (B) 70%, (C) 80%, (D) 90%
Answer is D. Chicken pox is highly contagious with secondary attack rates of nearly 90%. The period of communicability ranges from 1 to 2 days before onset of rash to 4 to 5 days thereafter. Ref: Park 21st edition, page 134