Microbiology general microbiology 39bfab9a 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 High-Yield Explanation 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