For at opretholde beskyttelsen imod kolera anbefales en enkelt boosterdosis efter to år for voksne og børn fra seksårsalderen og efter seks måneder for børn i alderen fra to til seks år.
For continuous protection against cholera, a single booster dose is recommended after two years for adults and children from six years of age, and after six months for children aged between two and six years.