Study to Assess the Efficacy, Immunogenicity and Safety of Liquid Human Rotavirus Vaccine, in Healthy Chinese Infants

A gastroenteritis episode was classified positive for rotavirus (RV) and caused by the circulating wild-type (WT) RV strains if RV other than the vaccine strain was identified in a stool sample collected during the episode.

A gastroenteritis episode was classified positive for rotavirus (RV) if RV was identified in a stool sample collected during the episode. RV types assessed were G1 Wild Type (G1WT), G2, G3, G9, GX (G type unknown, but not vaccine strain), P4, P8 Wild Type (P8WT), P9, PX (P type unknown, but not vaccine strain) and Pooled Non-G1WT.

A gastroenteritis episode was classified positive for rotavirus (RV) if RV was identified in a stool sample collected during the episode. Severe RVGE was defined as an episode of RVGE with score equal to or higher than (>=) 11 on a 20-point Vesikari scoring system. RV types assessed were G1 Wild Type (G1WT), G2, G3, G9, GX (G type unknown, but not vaccine strain), P4, P8 Wild Type (P8WT), P9, PX (P type unknown, but not vaccine strain) and Pooled Non-G1WT.

A gastroenteritis episode was classified positive for rotavirus (RV) and caused by the circulating WT RV strains if RV other than the vaccine strain was identified in a stool sample collected during the episode.

Severe GE was defined as an episode of GE with score equal to or higher than (>=) 11 on a 20-point Vesikari scoring system. This outcome measure concerns results for GE episodes due to any cause.

Assessed solicited general symptoms were fever,defined as axillary temperature (T) above or equal to [>=] 37.5 degrees Celsius [°C] (if GSK scale) or >= 37.1°C (if Chinese scale), fussiness/irritability, loss of appetite, cough/runny nose, diarrhea and vomiting. Any = any occurrence of the specified solicited general symptom regardless of the intensity grade or relationship to vaccination. This outcome measure was only assessed in subjects from Sub-cohort 1, who received the EPI vaccination independently of study vaccination with the Rotarix vaccine/placebo.

Solicited general symptoms assessed following administration of the co-administered EPI vaccines were drowsiness, gastrointestinal symptoms, fussiness/irritability, loss of appetite, and fever, defined as axillary temperature (T) above or equal to [>=] 37.5 degrees Celsius [°C] (if GSK scale) or >= 37.1°C (if Chinese scale ). Any = any occurrence of the specified solicited general symptom regardless of the intensity grade or relationship to vaccination. This outcome measure was only assessed in subjects from Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo.

Solicited local symptoms assessed following administration of the co-administered EPI vaccines were pain, swelling, and redness. Any = any occurrence of the specified solicited local symptom regardless of the intensity grade. This outcome measure was only assessed in subjects from Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo.

An unsolicited AE is any adverse event (i.e. any untoward medical occurrence in a patient or clinical investigation subject, temporally associated with use of a medicinal product, whether or not considered related to the medicinal product) reported in addition to those solicited during the clinical study and any solicited symptom with onset outside the specified period of follow-up for solicited symptoms. Any = occurrence of an unsolicited AE regardless of the intensity grade or relationship to vaccination.

SAEs assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization, or result in disability/incapacity. Any = occurrence of an SAE regardless of the intensity grade or relationship to vaccination.

A seroconverted subject was defined as a subject seronegative at baseline (Day 0) with the appearance of anti-RV IgA antibody concentration greater than or equal to (≥) 20 units per milliliter (U/mL) at the time point assessed. A seronegative subject was defined as a subject with anti-RV IgA antibody concentration lower than (<) 20 U/mL.

A seroconverted subject was defined as a subject seronegative at baseline (Day 0) with the appearance of anti-RV IgA antibody concentration greater than or equal to (≥) 20 units per milliliter (U/mL) at the time point assessed. A seronegative subject was defined as a subject with anti-RV IgA antibody concentration lower than (<) 20 U/mL.

A subject seropositive for anti-rotavirus (anti-RV) immunoglobulin A (IgA) antibodies was defined as a subject anti-RV IgA antibody concentration greater than or equal to (≥) the seropositivity cut-off of 20 units per milliliter (U/mL).

Concentrations were expressed as geometric mean concentrations (GMCs), in units per milliliter (U/mL). The cut-off of the assay was the seropositivity cut-off (≥ 20 U/mL).

Concentrations were expressed as geometric mean concentrations (GMCs), in units per milliliter (U/mL). The cut-off of the assay was the seropositivity cut-off (≥ 20 U/mL).

Concentrations were expressed as geometric mean concentrations (GMCs), in units per milliliter (U/mL). The cut-off of the assay was the seropositivity cut-off (≥ 20 U/mL).

A subject seroprotected against diphtheria/tetanus was defined as a subject with an anti-diphtheria (anti-D)/anti-tetanus (anti-T) antibody concentrations greater than or equal to (≥) 0.1 international units per milliliter (IU/mL). This outcome measure concerns solely subjects in Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo

Concentrations were expressed as geometric mean concentrations (GMCs) in international unit per milliliter (IU/mL). The cut-off of the assay was the seroprotection cut-off assay (≥ 0.1 IU/mL). This outcome measure concerns solely subjects in Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo.

A subject seroprotected against poliovirus types 1, 2 and 3 was defined as a subject with anti-poliovirus type 1 (anti-polio 1)/anti-polio 2/anti-polio 3 antibody titer greater than or equal to (≥) 8 estimated doses 50% (ED50). This outcome measure concerns solely subjects in Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo (cf. population definition below).

Titers were expressed as geometric mean titers (GMTs). The cut-off of the assay was the seroprotection cut-off (≥ 8 estimated doses 50% [ED50] for anti-poliovirus type 1 [anti-polio 1]/anti-polio 2/anti-polio 3 antibodies. This outcome measure concerns solely subjects in Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo.

Antibody assessment was performed by enzyme-linked immunosorbent assay (ELISA). A subject seropositive for anti-PT/anti-FHA/anti-PRN antibodies was defined as a subject with an anti-PT/anti-FHA/anti-PRN antibody concentrations greater than or equal to (≥) 5 ELISA units per milliliter (EL.U/mL). This outcome measure concerns solely subjects in Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo.

Antibody assessment was performed by enzyme-linked immunosorbent assay (ELISA). Concentrations were expressed as geometric mean concentrations (GMCs) in ELISA units per milliliter (EL.U/mL). The cut-off of the assay was the seropositivity cut-off (≥ 5 EL.U/mL) for all antibodies assessed (anti-PT, anti-FHA and anti-PRN). This outcome measure concerns solely subjects in Sub-cohort 2, who received the EPI vaccination concomitantly with study vaccination with the Rotarix vaccine/placebo.