You are dicussing yellow fever vaccination with a middle aged man who frequently travels. He now requires a ceificate of vaccination for his business trip. What will your advice about the validity of the vaccine be?

In India, to get a valid ceificate it has to be validated with the official stamp of Ministry of health, after which the ceificate will be valid from the 10th days to 10 years after vaccination. Following this revaccination is required. Note : India requires vaccination of infants also. Ref: Park, 21st Edition, Page 258, 259.