As per national immunization schedule, 1ST DPT booster has to be given at
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
5-6 yrs
16-24 months
18 weeks
16 years
general microbiology