71,725 infants were evaluated in 3 placebo-controlled clinical trials including 36,165 infants in the group that received RotaTeq and 35,560 infants in the group that received placebo. Parents/guardians were contacted on days 7, 14, and 42 after each dose regarding intussusception and any other serious adverse events. The racial distribution was as follows: White (69% in both groups); Hispanic-American (14% in both groups); Black (8% in both groups); Multiracial (5% in both groups); Asian (2% in both groups); Native American (RotaTeq 2%, placebo 1%); and Other (<1% in both groups). The gender distribution was 51% male and 49% female in both vaccination groups.
Because clinical trials are conducted under conditions that may not be typical of those observed in clinical practice, the adverse reaction rates presented below may not be reflective of those observed in clinical practice.
Serious Adverse Events
Serious adverse events occurred in 2.4% of recipients of RotaTeq when compared to 2.6% of placebo recipients within the 42-day period of a dose in the phase 3 clinical studies of RotaTeq. The most frequently reported serious adverse events for RotaTeq compared to placebo were:
bronchiolitis (0.6% RotaTeq vs. 0.7% Placebo),
gastroenteritis (0.2% RotaTeq vs. 0.3% Placebo),
pneumonia (0.2% RotaTeq vs. 0.2% Placebo),
fever (0.1% RotaTeq vs. 0.1% Placebo), and
urinary tract infection (0.1% RotaTeq vs. 0.1% Placebo).
Deaths
Across the clinical studies, 52 deaths were reported. There were 25 deaths in the RotaTeq recipients compared to 27 deaths in the placebo recipients. The most commonly reported cause of death was sudden infant death syndrome, which was observed in 8 recipients of RotaTeq and 9 placebo recipients.
Intussusception
In Study 006, 34,837 vaccine recipients and 34,788 placebo recipients were monitored by active surveillance to identify potential cases of intussusception at 7, 14, and 42 days after each dose, and every 6 weeks thereafter for 1 year after the first dose.
For the primary safety outcome, cases of intussusception occurring within 42 days of any dose, there were 6 cases among RotaTeq recipients and 5 cases among placebo recipients (see Table 1). The data did not suggest an increased risk of intussusception relative to placebo.
Table 1: Confirmed cases of intussusception in recipients of RotaTeq as compared with placebo recipients during Study 006 | RotaTeq (n=34,837) | Placebo (n=34,788) |
| Confirmed intussusception cases within 42 days of any dose | 6 | 5 |
| Relative risk (95% CI) Relative risk and 95% confidence interval based upon group sequential design stopping criteria employed in Study 006. | 1.6 (0.4, 6.4) |
| Confirmed intussusception cases within 365 days of dose 1 | 13 | 15 |
| Relative risk (95% CI) | 0.9 (0.4, 1.9) |
Among vaccine recipients, there were no confirmed cases of intussusception within the 42-day period after the first dose, which was the period of highest risk for the rhesus rotavirus-based product (see Table 2).
Table 2: Intussusception cases by day range in relation to dose in Study 006 | Dose 1 | Dose 2 | Dose 3 | Any Dose |
| Day Range | RotaTeq | Placebo | RotaTeq | Placebo | RotaTeq | Placebo | RotaTeq | Placebo |
| 1-7 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 1-14 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 |
| 1-21 | 0 | 0 | 3 | 0 | 0 | 1 | 3 | 1 |
| 1-42 | 0 | 1 | 4 | 1 | 2 | 3 | 6 | 5 |
All of the children who developed intussusception recovered without sequelae with the exception of a 9-month-old male who developed intussusception 98 days after dose 3 and died of post-operative sepsis. There was a single case of intussusception among 2,470 recipients of RotaTeq in a 7-month-old male in the phase 1 and 2 studies (716 placebo recipients).
Hematochezia
Hematochezia reported as an adverse experience occurred in 0.6% (39/6,130) of vaccine and 0.6% (34/5,560) of placebo recipients within 42 days of any dose. Hematochezia reported as a serious adverse experience occurred in <0.1% (4/36,150) of vaccine and <0.1% (7/35,536) of placebo recipients within 42 days of any dose.
Seizures
All seizures reported in the phase 3 trials of RotaTeq (by vaccination group and interval after dose) are shown in Table 3.
Table 3: Seizures reported by day range in relation to any dose in the phase 3 trials of RotaTeq| Day range | 1-7 | 1-14 | 1-42 |
| RotaTeq | 10 | 15 | 33 |
| Placebo | 5 | 8 | 24 |
Seizures reported as serious adverse experiences occurred in <0.1% (27/36,150) of vaccine and <0.1% (18/35,536) of placebo recipients (not significant). Ten febrile seizures were reported as serious adverse experiences, 5 were observed in vaccine recipients and 5 in placebo recipients.
Kawasaki Disease
In the phase 3 clinical trials, infants were followed for up to 42 days of vaccine dose. Kawasaki disease was reported in 5 of 36,150 vaccine recipients and in 1 of 35,536 placebo recipients with unadjusted relative risk 4.9 (95% CI 0.6, 239.1).
Most Common Adverse Events
Solicited Adverse Events
Detailed safety information was collected from 11,711 infants (6,138 recipients of RotaTeq) which included a subset of subjects in Study 006 and all subjects from Studies 007 and 009 (Detailed Safety Cohort). A Vaccination Report Card was used by parents/guardians to record the child's temperature and any episodes of diarrhea and vomiting on a daily basis during the first week following each vaccination. Table 4 summarizes the frequencies of these adverse events and irritability.
Table 4: Solicited adverse experiences within the first week after doses 1, 2, and 3 (Detailed Safety Cohort)| Adverse experience | Dose 1 | Dose 2 | Dose 3 |
| RotaTeq | Placebo | RotaTeq | Placebo | RotaTeq | Placebo |
| Elevated temperature Temperature ≥100.5°F [38.1°C] rectal equivalent obtained by adding 1 degree F to otic and oral temperatures and 2 degrees F to axillary temperatures | n=5,616 17.1% | n=5,077 16.2% | n=5,215 20.0% | n=4,725 19.4% | n=4,865 18.2% | n=4,382 17.6% |
| n=6,130 | n=5,560 | n=5,703 | n=5,173 | n=5,496 | n=4,989 |
| Vomiting | 6.7% | 5.4% | 5.0% | 4.4% | 3.6% | 3.2% |
| | | | | | |
| Diarrhea | 10.4% | 9.1% | 8.6% | 6.4% | 6.1% | 5.4% |
| | | | | | |
| Irritability | 7.1% | 7.1% | 6.0% | 6.5% | 4.3% | 4.5% |
Other Adverse Events
Parents/guardians of the 11,711 infants were also asked to report the presence of other events on the Vaccination Report Card for 42 days after each dose.
Fever was observed at similar rates in vaccine (N=6,138) and placebo (N=5,573) recipients (42.6% vs. 42.8%). Adverse events that occurred at a statistically higher incidence (i.e., 2-sided p-value <0.05) within the 42 days of any dose among recipients of RotaTeq as compared with placebo recipients are shown in Table 5.
Table 5: Adverse events that occurred at a statistically higher incidence within 42 days of any dose among recipients of RotaTeq as compared with placebo recipients| Adverse event | RotaTeq N=6,138 | Placebo N=5,573 |
| n (%) | n (%) |
| Diarrhea | 1,479 (24.1%) | 1,186 (21.3%) |
| Vomiting | 929 (15.2%) | 758 (13.6%) |
| Otitis media | 887 (14.5%) | 724 (13.0%) |
| Nasopharyngitis | 422 (6.9%) | 325 (5.8%) |
| Bronchospasm | 66 (1.1%) | 40 (0.7%) |
Safety in Pre-Term Infants
RotaTeq or placebo was administered to 2,070 pre-term infants (25 to 36 weeks gestational age, median 34 weeks) according to their age in weeks since birth in Study 006. All pre-term infants were followed for serious adverse experiences; a subset of 308 infants was monitored for all adverse experiences. There were 4 deaths throughout the study, 2 among vaccine recipients (1 SIDS and 1 motor vehicle accident) and 2 among placebo recipients (1 SIDS and 1 unknown cause). No cases of intussusception were reported. Serious adverse experiences occurred in 5.5% of vaccine and 5.8% of placebo recipients. The most common serious adverse experience was bronchiolitis, which occurred in 1.4% of vaccine and 2.0% of placebo recipients. Parents/guardians were asked to record the child's temperature and any episodes of vomiting and diarrhea daily for the first week following vaccination. The frequencies of these adverse experiences and irritability within the week after dose 1 are summarized in Table 6.
Table 6: Solicited adverse experiences within the first week of doses 1, 2, and 3 among pre-term infants | Dose 1 | Dose 2 | Dose 3 |
| Adverse event | RotaTeq | Placebo | RotaTeq | Placebo | RotaTeq | Placebo |
| N=127 | N=133 | N=124 | N=121 | N=115 | N=108 |
| Elevated temperature Temperature ≥100.5°F [38.1°C] rectal equivalent obtained by adding 1 degree F to otic and oral temperatures and 2 degrees F to axillary temperatures | 18.1% | 17.3% | 25.0% | 28.1% | 14.8% | 20.4% |
| N=154 | N=154 | N=137 | N=137 | N=135 | N=129 |
| Vomiting | 5.8% | 7.8% | 2.9% | 2.2% | 4.4% | 4.7% |
| | | | | | |
| Diarrhea | 6.5% | 5.8% | 7.3% | 7.3% | 3.7% | 3.9% |
| | | | | | |
| Irritability | 3.9% | 5.2% | 2.9% | 4.4% | 8.1% | 5.4% |