CONCURRENT ORAL POLIOVIRUS AND RHESUS-HUMAN REASSORTANT ROTAVIRUS VACCINATION - EFFECTS ON IMMUNE-RESPONSES TO BOTH VACCINES AND ON EFFICACY OF ROTAVIRUS VACCINES

Interference between oral poliovirus vaccine (OPV) and monovalent (RRV -S1) and tetravalent (RRV-TV) rhesus-human rotavirus vaccines was eval uated, Serum antibody responses to OPV and rotavirus vaccines and effi cacy of rotavirus vaccines were compared among control and vaccine gro ups stratified by number of concurrent OPV and rotavirus vaccinations received, Neutralizing antibody titers to poliovirus type 1 tended to rise more steeply in placebo than RRV-TV recipients, but there were no significant differences in seroprevalence or in geometric mean titers (GMTs) of antibodies to types 1, 2, or 3 among groups. Concurrent OPV resulted in lower IgA GMTs to rotavirus in RRV-S1 but not RRV-TV reci pients. Rotavirus gastroenteritis rates among rotavirus vaccinees did not differ by number of concurrent OPV doses received, but the sample sizes were too small to rule out any effect. These results suggest OPV and rhesus-human rotavirus vaccines may be given at the same visit in the United States.