Social & Preventive Medicine Period of infectivity for chickenpox is: A 5 days prior to appearance of rash till 4 days afterwards B 4 days prior to appearance of rash till 5 days afterwards C 4 days prior to appearance of rash till 1 day afterwards D 1 day prior to appearance of rash till 4 days afterwards 💡 Explanation Period of infectivity for chickenpox is: ✓ Correct Answer: D. 1 day prior to appearance of rash till 4 days afterwards