The purpose of this study is to assess the safety, reactogenicity and immune responses of two doses of the investigational RSV vaccines (with different formulations), when administered intramuscularly (IM) according to a 0, 2 month schedule, in older adults aged 60 to 80 years. As the investigational vaccines have not yet been tested in humans before, the study will first assess the safety, reactogenicity and immune responses in young adults aged 18 to 40 years. The study will thus be conducted in 2 parts (Part A and Part B).
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Number of Subjects With Any Solicited Local Symptoms After First Vaccination Dose
Timeframe: During a 7-day follow-up period after first vaccination dose (i.e., on the day of vaccination [at Day 1] and 6 subsequent days)
Number of Subjects With Any Solicited Local Symptoms After Second Vaccination Dose
Timeframe: During a 7-day follow-up period after second vaccination dose (i.e., on the day of vaccination [at Day 61] and 6 subsequent days)
Number of Subjects With Any Solicited General Symptom After First Vaccination Dose
Timeframe: During a 7-day follow-up period after the first vaccination dose (i.e., on the day of vaccination [at Day 1] and 6 subsequent days)
Number of Subjects With Any Solicited General Symptom After Second Vaccination Dose
Timeframe: During a 7-day follow-up period after the second vaccination dose (i.e., on the day of vaccination [at Day 61] and 6 subsequent days)
Number of Subjects With Any Unsolicited Adverse Events (AEs) After Any Vaccination Dose
Timeframe: During a 30-day follow-up period (i.e., on the day of vaccination and 29 subsequent days) after any vaccination dose (across doses)
Number of Subjects Presenting Change From Baseline in Hematology and Biochemistry With Respect of Normal Laboratory Ranges, After First Vaccine Dose (Part A Groups)
Timeframe: At baseline and at 7 days after the first vaccine dose (Day 8)
Number of Subjects Presenting Change From Baseline in Hematology and Biochemistry With Respect of Normal Laboratory Ranges, After First Vaccine Dose (Part B Groups)
Timeframe: At baseline and at 7 days after the first vaccine dose (Day 8)
Number of Subjects Presenting Change From Baseline in Hematology and Biochemistry With Respect of Normal Laboratory Ranges, After Second Vaccine Dose (Part A Groups)
Timeframe: At baseline and at 7 days after the second vaccine dose (Day 68)
Number of Subjects Presenting Change From Baseline in Hematology and Biochemistry With Respect of Normal Laboratory Ranges, After Second Vaccine Dose (Part B Groups)
Timeframe: At baseline and at 7 days after the second vaccine dose (Day 68)
Number of Subjects With Any Grade 3 Non-serious AEs (Solicited and Unsolicited) After First Dose of Vaccination
Timeframe: During a 30-day follow-up period (i.e., on the day of vaccination at Day 1, and 29 subsequent days) after first dose of vaccination
Number of Subjects With Any Grade 3 Non-serious AEs (Solicited and Unsolicited) After Second Dose of Vaccination
Timeframe: During a 30-day follow-up period (i.e., on the day of vaccination at Day 61, and 29 subsequent days) after second dose of vaccination
Number of Subjects With Any Serious Adverse Events (SAEs) up to 30 Days After the Second Vaccination
Timeframe: From first vaccination (Day 1) up to 30 days post second vaccination (Day 91)
Number of Subjects With Any Potential Immune-mediated Diseases (pIMDs) up to 30 Days After the Second Vaccination (Part B Groups)
Timeframe: From first vaccination (Day 1) up to 30 days post second vaccination (Day 91)