When should the rotavirus vaccine be administered?

The rotavirus vaccine is typically administered in a series of doses, with the first dose given at 2 months of age, followed by additional doses at 4 months and 6 months, depending on which vaccine formulation is used. This series is designed to provide optimal immunity against rotavirus at a point when infants are especially vulnerable to severe diarrhea caused by the virus. Starting the vaccination series at 2 months ensures that the infants can begin developing immunity early enough to protect them during peak rotavirus seasons.

The choices that suggest administration at older ages, such as 9 months, 12 months, or 18 months, do not align with the recommended guidelines. These age groups are outside the optimal window for receiving the rotavirus vaccine, which is crucial for preventing potentially severe gastroenteritis in infants and young children. By allowing the rotavirus vaccine to be administered during the recommended early months, children can build a protective response before they are exposed to the virus commonly circulating in the community.