As per national immunization schedule, 1ST DPT booster has to be given at: (A) 5-6 yrs, (B) 16-24 months, (C) 18 weeks, (D) 16 years
Answer is B. DPT is given at 6,10,14 weeks 1st booster at 16-24 months and 2nd booster at 5-6yrs Ref: Textbook of Microbiology Baveja 5th ed Pg 612