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
Post exposure vaccination for measles should be done in: September 2009 
Select and explain. 
A. 1 day of exposure, B. 2 day of exposure, C. 3 day of exposure, D. 7 day of exposure
C: 3 day of exposure
Answer: C: 3 day of exposure 
Explanation: Ans. C: 3 Day of exposure Rubeola (Measles) Immune Globulin Intramuscular injection of measles (rubeola) immune globulin is indicated for unvaccinated individuals exposed to the disease. Accepted guidelines recommend that the immune globulin should be administered within 3-4 days of exposure The dose recommended by WHO is 0.25 ml/ kg of body weight.