This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
True about polio vaccination is all EXCEPT: 
Select and explain. 
A. Follow up of AFP every 30 days, B. Salk contains three types of polio virus, C. Pulse polio doses are extra and supplemental, D. Oral polio vaccine provides intestinal immunity also
A: Follow up of AFP every 30 days
Answer: A: Follow up of AFP every 30 days 
Explanation: Follow up of AFP every 30 days REF: Park 20thedition page 180-184 AFP surveillance is done every 60 days to check for residual paralysis Salk contains all three types of polio virus inactivated by formalin, contains 20,2 & 4D antigen of types 1,2 and 3 The doses of OPV given during pulse polio immunization are extra and supplemental, and do not replace the doses given during routine immunization. OPV induces both humoral and cell mediated immunity