This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Typhoid oral vaccine is given - 
Select and explain. 
A. 1, 3, 5 days, B. 1, 2, 3 days, C. 1, 2, 4 days, D. 1, 7, 14 days
A: 1, 3, 5 days
Answer: A: 1, 3, 5 days 
Explanation: <p> Typhoid oral vaccine:- Live attenuated Ty2 strain Lyophilised vaccine available as enteric coated capsules. Licensed for use in children more than 5 years. Administered on day 1,3,5 days. Protective immunity achieved 7 days after last dose. The recommendation is to repeat this series every 3 years for people living in endemic areas and every year for individual travelling from non endemic to endemic areas. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.237}</p>