If a 11 month old child has received two doses of DPT and polio, comes for fuher immunization after 5 months of the last dose, what should be done?: (A) Repeat the whole course, (B) Repeat the 2nd dose and continue rest of the course, (C) Give 3rd dose and continue the course, (D) Give only booster dose
Answer is D. Interruption of the schedule with a delay between doses does not interfere with the final immunity achieved. Booster dose is sufficient. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 134