Rotavirus vaccine is an oral vaccine used to help prevent rotavirus infection in children. Rotavirus infection can cause fever, vomiting, and diarrhea, which may become severe and lead to dehydration, hospitalization, and in some cases, death. The vaccine may not provide complete protection for all children, and it is not effective in children who are already infected with the virus.
Rotavirus is a major cause of severe acute gastroenteritis in infants and young children. There are two commonly available types of rotavirus vaccines. One is a live attenuated monovalent vaccine derived from a human strain (G1), which protects against gastroenteritis caused by G1, G3, G4, and G9 serotypes. The other is a live pentavalent human-bovine reassortant vaccine, which protects against G1, G2, G3, and G4 serotypes. Although porcine circovirus (PCV1 and PCV2) DNA has been detected in some rotavirus vaccines, current evidence indicates that it does not pose a safety risk to humans. The exact mechanism of action is not fully understood; however, it is known that the vaccine viruses replicate in the small intestine and stimulate active immunity.