Please assess the completion status of the following clinical trial:

Trial Title: A Study of Ad26.COV2.S for the Prevention of SARS-CoV-2-Mediated COVID-19 in Adult Participants

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Contraceptive (birth control) use should be consistent with local regulations regarding the acceptable methods of contraception for those participating in clinical studies~* All participants of childbearing potential must: have a negative highly sensitive urine pregnancy test at screening; and have a negative highly sensitive urine pregnancy test immediately prior to each study vaccine administration~* Participant agrees to not donate bone marrow, blood, and blood products from the first study vaccine administration until 3 months after receiving the last dose of study vaccine~* Must be willing to provide verifiable identification, has means to be contacted and to contact the investigator during the study~* Must be able to read, understand, and complete questionnaires in the electronic clinical outcome assessment (eCOA) (that is, the coronavirus disease-2019 \[COVID 19\] signs and symptoms surveillance question, the e-Diary, and the electronic patient-reported outcomes (ePROs). Note: Participants with visual impairment are eligible for study participation and may have caregiver assistance in completing the electronic clinical outcome assessment (eCOA) questionnaires~Exclusion Criteria:~* Participant has a clinically significant acute illness (this does not include minor illnesses such as diarrhea or mild upper respiratory tract infection) or temperature greater than or equal to (\>=) 38.0 degree Celsius (100.4-degree Fahrenheit) within 24 hours prior to the planned first dose of study vaccine; randomization at a later date is permitted at the discretion of the investigator and after consultation with the sponsor~* Participant received or plans to receive: (a) licensed live attenuated vaccines - within 28 days before or after planned administration of study vaccine ; and (b) other licensed (not live) vaccines - within 14 days before or after planned administration of study vaccine~* Participant previously received a coronavirus vaccine~* Participant received an investigational drug (including investigational drugs for prophylaxis of COVID-19) within 30 days or used an invasive investigational medical device within 30 days or received investigational immunoglobulin (Ig) or monoclonal antibodies within 3 months, or received convalescent serum for COVID-19 treatment within 4 months or received an investigational vaccine (including investigational Adenoviral-vectored vaccines) within 6 months before the planned administration of the first dose of study vaccine or is currently enrolled or plans to participate in another investigational study during the course of this study

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- Ad26.COV2.S (Type: EXPERIMENTAL): Participants will receive intramuscular (IM) injection of Ad26.COV2.S at a dose level of 5\*10\^10 virus particles (vp) as single dose vaccine on Day 1. At Year 1 (booster visit), participants who previously received any coronavirus disease-2019 (COVID-19) vaccination (as primary regimen or additional dose) will be offered a single booster dose of Ad26.COV2.S at the 5\*10\^10 vp dose level.
- Placebo (Type: EXPERIMENTAL): Participants will receive IM injection of placebo on Day 1. At Month 6/unblinding visit, post Emergency Use Authorization (EUA), conditional licensure, or approval for the single dose regimen, participants initially receiving placebo will be offered to receive a single dose of Ad26.COV2.S vaccine IM at a dose level of 5\*10\^10 vp. At Year 1 (booster visit), participants who previously received any COVID-19 vaccination (as primary regimen or additional dose) will be offered a single booster dose of Ad26.COV2.S at the 5\*10\^10 vp dose level.

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: complete