Children and adults who have ongoing exposure to Salmonella Typhi, including those travelling for a long time or living in an endemic region, are recommended to be revaccinated

Revaccination is recommended if a person has continued exposure to Salmonella Typhi, such as by travelling for a long time or living in an endemic region.

Children aged ≥2 years and adults who received parenteral typhoid vaccine for their 1st vaccination are recommended to receive a repeat dose of parenteral typhoid vaccine every 3 years.

Children aged ≥6 years and adults who received oral typhoid vaccine for their 1st vaccination are recommended to receive a repeat 3- or 4-dose course of oral typhoid vaccine either:

• 3 years after a 3-dose course, or
• 5 years after a 4-dose course 

The revaccination schedule for oral typhoid vaccine consists of 1 capsule on days 1, 3 and 5 (and day 7 if following a 4-dose schedule) taken 1 hour before food.