Intussusception is a bowel obstruction in which the bowel folds in on itself.
The manufacturer estimated that 1.5 million doses of RVV-TV had been administered in the U.S. as of the beginning of June, according to a CDC report. Preliminary studies in California and Minnesota suggest an increased risk of intussusception in the first weeks after receiving the vaccine. Postponing vaccinations until November will allow for analysis of additional data, and rotavirus season is still four to six months away in most parts of the U.S., the agency said.