Social & Preventive Medicine Infectivity period of chickenpox is: March 2009 A 1 day before and 4 days after appearance of rash B 4 days before and 1 day after appearance of rash C Only when scab falls D Entire incubation period 💡 Explanation Infectivity period of chickenpox is: March 2009 ✓ Correct Answer: A. 1 day before and 4 days after appearance of rash