A Phase 2 interventional study of V160 and Placebo in Cytomegalovirus (CMV) Infections, sponsored by Merck Sharp & Dohme LLC. Completed at 95 sites in 7 countries. Open to female participants aged 16 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-01-23.
Sponsored by Merck Sharp & Dohme LLC · Phase 2, Interventional, and Prevention
This study evaluated the safety, tolerability, and efficacy of the cytomegalovirus (CMV) vaccine (V160) administered in a 2-dose or 3-dose regimen to healthy seronegative women 16 to 35 years of age. Participants received blinded V160 on Day 1, Month 2, and Month 6 (3-dose regimen), V160 on Day 1 and Month 6 and placebo at Month 2 (2-dose regimen), or placebo on Day 1, Month 2, and Month 6, and were followed to approximately Month 24. The primary hypothesis of the study was that administration of a 3-dose regimen of V160 will reduce the incidence of primary CMV infection compared to placebo.
Exclusion Criteria:
Participants received 3 doses of vaccine V160 (100 Units/0.5 mL dose with Merck aluminum phosphate adjuvant \[MAPA\], 4°C stable formulation) administered by intramuscular (IM) injection on Day 1, Month 2, and Month 6.
Biological: V160
Participants received 2 doses of vaccine V160 (100 Units/0.5 mL dose with MAPA, 4°C stable formulation) administered IM on Day 1 and Month 6 and a placebo-saline solution at Month 2.
Biological: V160 · Drug: Placebo
Participants received placebo (saline solution) by IM injection on Day 1, Month 2, and Month 6.
Drug: Placebo
V160 was administered as a 0.5 mL (100 Units/0.5 mL dose with Merck aluminum phosphate adjuvant \[MAPA\], 4°C stable formulation) IM injection.
Also known as: Human cytomegalovirus vaccine
Saline solution administered as a 0.5 mL IM injection
Number of Participants Who Became Infected With Wild-Type Cytomegalovirus Infection Starting at 4 Weeks Post Last Dose (V160 3-dose Regimen Group and Placebo Group)
Cytomegalovirus infection (CMVi) was defined as the detection of wild-type cytomegalovirus (CMV) (non vaccine type) by polymerase chain reaction in a single saliva or urine sample in a previously CMV-uninfected participant. CMVi cases in the 3-dose regimen and placebo groups were reported and incidence rate (per 100 person-years) calculated based on follow-up time starting at 4 weeks post last dose (Month 7) through approximately Month 24 (or time point to reach required cases for assessment). The percent reduction in CMVi incidence rate in the 3-dose regimen group compared to the placebo group was assessed.
Time frame: 4 weeks post last vaccination (Month 7) up to ~Month 24
Number of Participants With Solicited Injection-site Adverse Events
An adverse event (AE) is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. Following vaccination with V160 or placebo, the number of participants with solicited injection-site AEs was assessed. The solicited injection-site AEs assessed were redness/erythema, swelling, and pain.
Time frame: Up to 5 days after each vaccination
Number of Participants With Solicited Systemic AEs
An AE is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. Following vaccination with V160 or placebo, the number of participants with solicited systemic AEs was assessed. The solicited systemic AEs assessed were fatigue, joint pain/arthralgia, muscle pain/myalgia, and headache.
Time frame: Up to 14 days after each vaccination
Number of Participants With Vaccine-related Serious Adverse Events
A serious adverse event (SAE) is an AE that is life-threatening, requires or prolongs an existing hospitalization, results in persistent or significant disability or incapacity, is a congenital anomaly or birth defect, or is another important medical event deemed such by medical or scientific judgment. Relatedness of an SAE to the study vaccine was determined by the investigator. Following vaccination with V160 or placebo, the number of participants with vaccine-related serious adverse events was assessed.
Time frame: Up to 14 days after each vaccination
Number of Participants Who Became Infected With Wild-Type CMV Infection Starting at 4 Weeks Post Last Dose (V160 2-dose Regimen Group and Placebo Group)
CMVi is defined as detection of wild-type CMV (non-vaccine type) by polymerase chain reaction in a single saliva or urine sample in a previously CMV-uninfected participant. CMVi cases in the 2-dose regimen and placebo groups were reported and incidence rate (per 100 person-years) calculated based on follow-up time starting at 4 weeks post last dose (Month 7) through approximately Month 24 (or time point to reach required cases for assessment). The percent reduction in CMVi incidence rate in the 2-dose regimen group compared to the placebo group was assessed.
Time frame: 4 weeks post last vaccination (Month 7) up to ~Month 24
| Milestone | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo |
|---|---|---|---|
| Started | 733 | 733 | 734 |
| Treatment 1 | 729 | 729 | 733 |
| Treatment 2 | 680 | 680 | 679 |
| Treatment 3 | 614 | 631 | 622 |
| Completed | 614 | 631 | 622 |
| Not completed | 119 | 102 | 112 |
| Withdrew: Withdrawal by subject | 46 | 46 | 52 |
| Withdrew: Adverse event | 8 | 7 | 0 |
| Withdrew: Lost to follow-up | 41 | 24 | 39 |
| Withdrew: Non-compliance with study drug | 2 | 2 | 0 |
| Withdrew: Physician decision | 5 | 2 | 3 |
| Withdrew: Pregnancy | 10 | 12 | 12 |
| Withdrew: Protocol deviation | 2 | 3 | 3 |
| Withdrew: Withdrawal by parent/guardian | 1 | 2 | 2 |
| Withdrew: Randomized but not treated | 4 | 4 | 1 |
Cytomegalovirus infection (CMVi) was defined as the detection of wild-type cytomegalovirus (CMV) (non vaccine type) by polymerase chain reaction in a single saliva or urine sample in a previously CMV-uninfected participant. CMVi cases in the 3-dose regimen and placebo groups were reported and incidence rate (per 100 person-years) calculated based on follow-up time starting at 4 weeks post last dose (Month 7) through approximately Month 24 (or time point to reach required cases for assessment). The percent reduction in CMVi incidence rate in the 3-dose regimen group compared to the placebo group was assessed.
| Participants | V160 3-Dose Regimen | Placebo |
|---|---|---|
| Number of Participants Who Became Infected With Wild-Type Cytomegalovirus Infection Starting at 4 Weeks Post Last Dose (V160 3-dose Regimen Group and Placebo Group) | 14 | 24 |
An adverse event (AE) is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. Following vaccination with V160 or placebo, the number of participants with solicited injection-site AEs was assessed. The solicited injection-site AEs assessed were redness/erythema, swelling, and pain.
| Participants | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo |
|---|---|---|---|
| Number of Participants With Solicited Injection-site Adverse Events | 683 | 668 | 249 |
An AE is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study treatment. Following vaccination with V160 or placebo, the number of participants with solicited systemic AEs was assessed. The solicited systemic AEs assessed were fatigue, joint pain/arthralgia, muscle pain/myalgia, and headache.
| Participants | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo |
|---|---|---|---|
| Number of Participants With Solicited Systemic AEs | 621 | 633 | 508 |
A serious adverse event (SAE) is an AE that is life-threatening, requires or prolongs an existing hospitalization, results in persistent or significant disability or incapacity, is a congenital anomaly or birth defect, or is another important medical event deemed such by medical or scientific judgment. Relatedness of an SAE to the study vaccine was determined by the investigator. Following vaccination with V160 or placebo, the number of participants with vaccine-related serious adverse events was assessed.
| Participants | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo |
|---|---|---|---|
| Number of Participants With Vaccine-related Serious Adverse Events | 0 | 0 | 0 |
CMVi is defined as detection of wild-type CMV (non-vaccine type) by polymerase chain reaction in a single saliva or urine sample in a previously CMV-uninfected participant. CMVi cases in the 2-dose regimen and placebo groups were reported and incidence rate (per 100 person-years) calculated based on follow-up time starting at 4 weeks post last dose (Month 7) through approximately Month 24 (or time point to reach required cases for assessment). The percent reduction in CMVi incidence rate in the 2-dose regimen group compared to the placebo group was assessed.
| Participants | V160 2-Dose Regimen | Placebo |
|---|---|---|
| Number of Participants Who Became Infected With Wild-Type CMV Infection Starting at 4 Weeks Post Last Dose (V160 2-dose Regimen Group and Placebo Group) | 31 | 24 |
Collected over All-cause mortality and serious adverse events: Up to ~Month 24; Non-serious adverse events: Up to 14 days following any vaccination.. Non-serious events are listed at a 5% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| V160 3-Dose Group | 0/733 (0%) | 22/728 (3%) | 697/728 (95.7%) |
| V160 2-Dose Group | 0/733 (0%) | 29/729 (4%) | 700/729 (96%) |
| Placebo Group | 0/734 (0%) | 26/732 (3.6%) | 557/732 (76.1%) |
| Event | V160 3-Dose Group | V160 2-Dose Group | Placebo Group |
|---|---|---|---|
| Abortion spontaneousPregnancy, puerperium and perinatal conditions | 2/728 | 6/729 | 7/732 |
| DepressionPsychiatric disorders | 2/728 | 0/729 | 1/732 |
| CholelithiasisHepatobiliary disorders | 0/728 | 2/729 | 0/732 |
| PneumoniaInfections and infestations | 1/728 | 2/729 | 0/732 |
| Urinary tract infectionInfections and infestations | 0/728 | 2/729 | 0/732 |
| Ankle fractureInjury, poisoning and procedural complications | 0/728 | 2/729 | 1/732 |
| Anembryonic gestationPregnancy, puerperium and perinatal conditions | 0/728 | 0/729 | 2/732 |
| Ectopic pregnancyPregnancy, puerperium and perinatal conditions | 0/728 | 0/729 | 2/732 |
| Abdominal pain lowerGastrointestinal disorders | 1/728 | 1/729 | 0/732 |
| Oesophageal ulcerGastrointestinal disorders | 1/728 | 0/729 | 0/732 |
| Event | V160 3-Dose Group | V160 2-Dose Group | Placebo Group |
|---|---|---|---|
| Injection site painGeneral disorders | 680/728 | 664/729 | 239/732 |
| FatigueGeneral disorders | 457/728 | 461/729 | 357/732 |
| MyalgiaMusculoskeletal and connective tissue disorders | 455/728 | 424/729 | 200/732 |
| HeadacheNervous system disorders | 434/728 | 450/729 | 368/732 |
| Injection site erythemaGeneral disorders | 254/728 | 208/729 | 30/732 |
| Injection site swellingGeneral disorders | 248/728 | 233/729 | 21/732 |
| ArthralgiaMusculoskeletal and connective tissue disorders | 162/728 | 162/729 | 76/732 |
| PyrexiaGeneral disorders | 75/728 | 90/729 | 27/732 |
| Oropharyngeal painRespiratory, thoracic and mediastinal disorders | 62/728 | 65/729 | 69/732 |
| NauseaGastrointestinal disorders | 45/728 | 55/729 | 46/732 |
| Age, Continuous(Years) | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo | Total |
|---|---|---|---|---|
| Mean | 26.0 ± 5.0 | 26.1 ± 4.9 | 25.9 ± 4.9 | 26.0 ± 4.9 |
| Sex: Female, Male(Participants) | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo | Total |
|---|---|---|---|---|
| Female | 733 | 733 | 734 | 2200 |
| Male | 0 | 0 | 0 | 0 |
| Ethnicity (NIH/OMB)(Participants) | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo | Total |
|---|---|---|---|---|
| Hispanic or Latino | 144 | 145 | 143 | 432 |
| Not Hispanic or Latino | 588 | 585 | 587 | 1760 |
| Unknown or Not Reported | 1 | 3 | 4 | 8 |
| Race (NIH/OMB)(Participants) | V160 3-Dose Regimen | V160 2-Dose Regimen | Placebo | Total |
|---|---|---|---|---|
| American Indian or Alaska Native | 0 | 1 | 4 | 5 |
| Asian | 6 | 7 | 6 | 19 |
| Native Hawaiian or Other Pacific Islander | 0 | 0 | 0 | 0 |
| Black or African American | 47 | 49 | 43 | 139 |
| White | 657 | 652 | 665 | 1974 |
| More than one race | 23 | 23 | 16 | 62 |
| Unknown or Not Reported | 0 | 1 | 0 | 1 |
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