These diarrhea episodes were mild since they were not accompanied by vomiting and fever. However higher numbers of diarrhea cases occurred in the group receiving 106.3 FFU/dose even though yet vaccine virus was only found in 3 diarrhea cases cumulatively in Rotavin-M1 groups

3H and 2H and for 1 case in Rotarix™ group, suggesting that diet or bacterial and protozoal infections might be the cause of diarrhea in these children. In another Rotarix™ trial in Vietnam, the percentage of children with diarrhea after each vaccination dose was 3.1–6.1%, equivalent ATM Kinase Inhibitor in vitro to what was found in this study [7]. Rotarix™ at 105.6–106.8 CCID also caused 8.5–11% diarrhea case among children in the US and Canada [12]. The detection of vaccine virus in diarrhea

cases is not an uncommon phenomenon in trials using attenuated vaccine. In a dose-escalation study of 116E rotavirus vaccine in India, virus vaccine was also isolated in 2 out of 19 diarrhea cases and 2 out of 17 diarrhea cases after the 1st dose of 104 FFU and 105 FFU, respectively [13]. Thus, the rate of diarrhea observed in our study is comparable to similar studies of Rotarix™ and other live attenuated rotavirus vaccines and it is unlikely that the vaccine causes significant numbers of diarrhea cases in our children. Nonetheless, further investigation is in progress in a larger group of infants ZD1839 ic50 to determine if the 106.3 FFU dose can cause an increase in diarrhea cases among vaccinees. The safety profile of Rotavin-M1 is also featured in that the 160 infants who received the vaccine in either of the 2 or 3 doses did not have any severe adverse events, any significant excess of symptoms of diarrhea, vomiting, fever or irritability, or alterations in blood count or selected blood chemistries compared to the group that received the licensed vaccine. Adverse effects mainly occurred after the 1st dose and decreased

considerably after the 2nd and 3rd doses, similar to adverse events observed during in Rotarix™ trials in Vietnam or in other countries [7]. As a comparison, when the liquid form Rotarix™ was tested, approximately 50–65% children developed fever during the observation period [7]. In Singapore, fever rate after vaccination reached 25–30% after each dose of this licensed vaccine [14]. Once safety was established, the Phase 2 study examined the immune response and shedding during from both a low and a high titer formulation of the vaccine and both a 2-dose (8 and 16 weeks) and a 3-dose (8, 12 and 16 weeks) schedule. These results were compared with a group that received the licensed vaccine, Rotarix™, in its standard 2-dose schedule. Overall, the immune response measured as a 4-fold rise in IgA titers to rotavirus ranged from 51% to 73%, a range surrounding the response observed for Rotarix™ (58%). While the higher titer formulation performed slightly better than the low titer preparation, the addition of a third dose to the schedule (i.e.