"Risk of Intussusception after Monovalent Rotavirus Vaccination"
http://www.nejm.org/doi/full/10.1056/NEJMoa1311738?query=featured_home
"CONCLUSIONS

In this prospective postlicensure study of more than 200,000 doses of monovalent rotavirus vaccine, we observed a significant increase in the rate of intussusception after vaccination, a risk that must be weighed against the benefits of preventing rotavirus-associated illness. (Funded by the Centers for Disease Control and Prevention.)"