A Phase 2, Placebo-controlled, Randomised, Observer-blinded Trial To Evaluate The Safety, Tolerability And Immunogenicity Of A Clostridium Difficile Vaccine Administered As A 3-dose Regimen In Healthy Adults Aged 50 To 85 Years

Percentage of Participants Reporting Prespecified Local Reactions Within 14 Days After Dose 2 (50- to 64-Year Age Cohort)

时间窗: From Day of Dose 2 vaccination to within 14 days after Dose 2

Pain at injection site: mild=does not interfere with activity; moderate=interferes with activity; severe=prevents daily activity; Grade 4=emergency department visit or hospitalization. Redness/swelling: Mild=2.5 to 5.0 cm; moderate= \>5.0 to 10.0 cm; severe= \>10 cm; Grade 4=necrosis or exfoliative dermatitis for redness category and only necrosis for swelling category. Any local reaction=any pain at the injection site, any swelling, or any redness.

Percentage of Participants Reporting Prespecified Local Reactions Within 7 Days After Dose 1 (50- to 64-Year Age Cohort)

时间窗: From Day of Dose 1 vaccination to within 7 days after Dose 1

Pain at injection site: mild=does not interfere with activity; moderate=interferes with activity; severe=prevents daily activity; Grade 4=emergency department visit or hospitalization. Redness/swelling: Mild=2.5 to 5.0 cm; moderate= \>5.0 to 10.0 cm; severe= \>10 cm; Grade 4=necrosis or exfoliative dermatitis for redness category and only necrosis for swelling category. Any local reaction=any pain at the injection site, any swelling, or any redness.

Percentage of Participants With A Local Reaction Within 14 Days After Dose 2 (65- to 85-Year Age Cohort)

时间窗: From Day of Dose 2 vaccination to 14 days after Dose 2

Pain at injection site: mild=does not interfere with activity; moderate=interferes with activity; severe=prevents daily activity; Grade 4=emergency department visit or hospitalization. Redness/swelling: Mild=2.5 to 5.0 cm; moderate= \>5.0 to 10.0 cm; severe= \>10 cm; Grade 4=necrosis or exfoliative dermatitis for redness category and only necrosis for swelling category. Any local reaction=any pain at the injection site, any swelling, or any redness.

Percentage of Participants Reporting Prespecified Local Reactions Within 14 Days After Dose 3 (50- to 64-Year Age Cohort)

时间窗: From Day of Dose 3 vaccination to within 14 days after Dose 3

Pain at injection site: mild=does not interfere with activity; moderate=interferes with activity; severe=prevents daily activity; Grade 4=emergency department visit or hospitalization. Redness/swelling: Mild=2.5 to 5.0 cm; moderate= \>5.0 to 10.0 cm; severe= \>10 cm; Grade 4=necrosis or exfoliative dermatitis for redness category and only necrosis for swelling category. Any local reaction=any pain at the injection site, any swelling, or any redness.

Percentage of Participants Reporting Systemic Events Within 7 Days After Dose 1 (50- to 64-Year Age Cohort)

时间窗: From Day of Dose 1 vaccination to within 7 days of Dose 1

Fever=temperature ≥38.0°C (100.4°C): Mild=38.0°C to 38.4°C (100.4°F-101.1°F); moderate=38.5°C to 38.9°C (101.2°F-102.0°F); severe=39.0°C to 40.0°C (102.1°F-104.0°F); Grade 4= \>40.0°C (\>104.0°F). Vomiting: Mild=1 to 2 times in 24 hours; moderate= \>2 times in 24 hours; severe=requires intravenous hydration; Grade 4=emergency department visit or hospitalization for hypotensive shock. Diarrhea: Mild=2 to 3 loose stools in 24 hours; moderate=4 to 5 loose stools in 24 hours; severe= ≥6 loose stools in 24 hours; Grade 4=emergency department visit or hospitalization. Headache, fatigue, new or worsening joint or muscle pain: Mild=no interference with activity; moderate=some interference with activity; severe=significant interference with activity, prevents daily activity; Grade 4=emergency department visit or hospitalization. Any systemic event: Fever ≥38.0°C, vomiting, diarrhea, headache, fatigue, or new or worsening muscle or joint pain.

Percentage of Participants Reporting Adverse Events (AEs) to Month 2 and Serious AEs (SAEs) to Month 13 (50- to 64-Year Age Cohort)

时间窗: AEs: From informed consent to Visit 6 (Month 2). SAEs: From informed consent to Visit 9 (Month 13)

An AE is any untoward medical occurrence in a clinical investigation participant administered a product or medical device; the event need not necessarily have a causal relationship with the treatment or usage. An SAE is any untoward medical occurrence at any dose that results in death, persistent or significant disability/incapacity, or congenital anomaly/birth defect; is life-threatening; or requires or prolongs inpatient hospitalization.

Percentage of Participants Reporting Systemic Events Within 14 Days After Dose 3 (65- to 85-Year Age Cohort)

时间窗: From Day of Dose 3 vaccination to within 14 days after Dose 3

Fever=temperature ≥38.0°C (100.4°C): Mild=38.0°C to 38.4°C (100.4°F-101.1°F); moderate=38.5°C to 38.9°C (101.2°F-102.0°F); severe=39.0°C to 40.0°C (102.1°F-104.0°F); Grade 4= \>40.0°C (\>104.0°F). Vomiting: Mild=1 to 2 times in 24 hours; moderate= \>2 times in 24 hours; severe=requires intravenous hydration; Grade 4=emergency department visit or hospitalization for hypotensive shock. Diarrhea: Mild=2 to 3 loose stools in 24 hours; moderate=4 to 5 loose stools in 24 hours; severe= ≥6 loose stools in 24 hours; Grade 4=emergency department visit or hospitalization. Headache, fatigue, new or worsening joint or muscle pain: Mild=no interference with activity; moderate=some interference with activity; severe=significant interference with activity, prevents daily activity; Grade 4=emergency department visit or hospitalization. Any systemic event: Fever ≥38.0°C, vomiting, diarrhea, headache, fatigue, or new or worsening muscle or joint pain.

Percentage of Participants With A Systemic Event Within 14 Days of Dose 2 (50- to 64-Year Age Cohort)

时间窗: From Day of Dose 2 vaccination to within 14 days after Dose 2

Fever=temperature ≥38.0°C (100.4°C): Mild=38.0°C to 38.4°C (100.4°F-101.1°F); moderate=38.5°C to 38.9°C (101.2°F-102.0°F); severe=39.0°C to 40.0°C (102.1°F-104.0°F); Grade 4= \>40.0°C (\>104.0°F). Vomiting: Mild=1 to 2 times in 24 hours; moderate= \>2 times in 24 hours; severe=requires intravenous hydration; Grade 4=emergency department visit or hospitalization for hypotensive shock. Diarrhea: Mild=2 to 3 loose stools in 24 hours; moderate=4 to 5 loose stools in 24 hours; severe= ≥6 loose stools in 24 hours; Grade 4=emergency department visit or hospitalization. Headache, fatigue, new or worsening joint or muscle pain: Mild=no interference with activity; moderate=some interference with activity; severe=significant interference with activity, prevents daily activity; Grade 4=emergency department visit or hospitalization. Any systemic event: Fever ≥38.0°C, vomiting, diarrhea, headache, fatigue, or new or worsening muscle or joint pain.

Percentage of Participants Reporting Systemic Events Within 14 Days After Dose 3 (50- to 64-Year Age Cohort)

时间窗: From Day of Dose 3 vaccination to within 14 days after Dose 3

Fever=temperature ≥38.0°C (100.4°C): Mild=38.0°C to 38.4°C (100.4°F-101.1°F); moderate=38.5°C to 38.9°C (101.2°F-102.0°F); severe=39.0°C to 40.0°C (102.1°F-104.0°F); Grade 4= \>40.0°C (\>104.0°F). Vomiting: Mild=1 to 2 times in 24 hours; moderate= \>2 times in 24 hours; severe=requires intravenous hydration; Grade 4=emergency department visit or hospitalization for hypotensive shock. Diarrhea: Mild=2 to 3 loose stools in 24 hours; moderate=4 to 5 loose stools in 24 hours; severe= ≥6 loose stools in 24 hours; Grade 4=emergency department visit or hospitalization. Headache, fatigue, new or worsening joint or muscle pain: Mild=no interference with activity; moderate=some interference with activity; severe=significant interference with activity, prevents daily activity; Grade 4=emergency department visit or hospitalization. Any systemic event: Fever ≥38.0°C, vomiting, diarrhea, headache, fatigue, or new or worsening muscle or joint pain.

Percentage of Participants With A Local Reaction Within 7 Days of Dose 1 (65- to 85-Year Age Cohort)

时间窗: From Day of Dose 1 vaccination to within 7 days of Dose 1

Pain at injection site: mild=does not interfere with activity; moderate=interferes with activity; severe=prevents daily activity; Grade 4=emergency department visit or hospitalization. Redness/swelling: Mild=2.5 to 5.0 cm; moderate= \>5.0 to 10.0 cm; severe= \>10 cm; Grade 4=necrosis or exfoliative dermatitis for redness category and only necrosis for swelling category. Any local reaction=any pain at the injection site, any swelling, or any redness.

Percentage of Participants With A Local Reaction Within 14 Days After Dose 3 (65- to 85-Year Age Cohort)

时间窗: From Day of Dose 3 vaccination to 14 days after Dose 3

Pain at injection site: mild=does not interfere with activity; moderate=interferes with activity; severe=prevents daily activity; Grade 4=emergency department visit or hospitalization. Redness/swelling: Mild=2.5 to 5.0 cm; moderate= \>5.0 to 10.0 cm; severe= \>10 cm; Grade 4=necrosis or exfoliative dermatitis for redness category and only necrosis for swelling category. Any local reaction=any pain at the injection site, any swelling, or any redness.

Percentage of Participants With A Systemic Event Within 7 Days of Dose 1 (65- to 85-Year Age Cohort)

时间窗: From Day of Dose 1 vaccination to within 7 days of Dose 1

Fever=temperature ≥38.0°C (100.4°C): Mild=38.0°C to 38.4°C (100.4°F-101.1°F); moderate=38.5°C to 38.9°C (101.2°F-102.0°F); severe=39.0°C to 40.0°C (102.1°F-104.0°F); Grade 4= \>40.0°C (\>104.0°F). Vomiting: Mild=1 to 2 times in 24 hours; moderate= \>2 times in 24 hours; severe=requires intravenous hydration; Grade 4=emergency department visit or hospitalization for hypotensive shock. Diarrhea: Mild=2 to 3 loose stools in 24 hours; moderate=4 to 5 loose stools in 24 hours; severe= ≥6 loose stools in 24 hours; Grade 4=emergency department visit or hospitalization. Headache, fatigue, new or worsening joint or muscle pain: Mild=no interference with activity; moderate=some interference with activity; severe=significant interference with activity, prevents daily activity; Grade 4=emergency department visit or hospitalization. Any systemic event: Fever ≥38.0°C, vomiting, diarrhea, headache, fatigue, or new or worsening muscle or joint pain.

Percentage of Participants With a Systemic Event Within 14 Days of Dose 2 (65- to 85-Year Age Cohort)

时间窗: From Day of Dose 2 vaccination to within 14 days after Dose 2

Fever=temperature ≥38.0°C (100.4°C): Mild=38.0°C to 38.4°C (100.4°F-101.1°F); moderate=38.5°C to 38.9°C (101.2°F-102.0°F); severe=39.0°C to 40.0°C (102.1°F-104.0°F); Grade 4= \>40.0°C (\>104.0°F). Vomiting: Mild=1 to 2 times in 24 hours; moderate= \>2 times in 24 hours; severe=requires intravenous hydration; Grade 4=emergency department visit or hospitalization for hypotensive shock. Diarrhea: Mild=2 to 3 loose stools in 24 hours; moderate=4 to 5 loose stools in 24 hours; severe= ≥6 loose stools in 24 hours; Grade 4=emergency department visit or hospitalization. Headache, fatigue, new or worsening joint or muscle pain: Mild=no interference with activity; moderate=some interference with activity; severe=significant interference with activity, prevents daily activity; Grade 4=emergency department visit or hospitalization. Any systemic event: Fever ≥38.0°C, vomiting, diarrhea, headache, fatigue, or new or worsening muscle or joint pain.

Percentage of Participants Reporting Adverse Events (AEs) to Month 2 and Serious AEs (SAEs) to Month 13 (65- to 85-Year Age Cohort)

时间窗: AEs: From informed consent to Visit 6 (Month 2). SAEs: From informed consent to Visit 9 (Month 13)

An AE is any untoward medical occurrence in a clinical investigation participant administered a product or medical device; the event need not necessarily have a causal relationship with the treatment or usage. An SAE is any untoward medical occurrence at any dose that results in death, persistent or significant disability/incapacity, or congenital anomaly/birth defect; is life-threatening; or requires or prolongs inpatient hospitalization.