Please assess the completion status of the following clinical trial:

Trial Title: Trusted Messenger Intervention

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: HEALTH_SERVICES_RESEARCH
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Able and willing to give verbal informed consent to participate in the study or able to assent with guardian consent~* Expected to remain in the hospital for the duration of the study~* Mental health diagnosis Demographics~* Male, female, or transgender (no exclusion criteria based on gender or sexual orientation)~* Ages 18 or older~* Any race or ethnicity~* English speaking~Exclusion Criteria:~* Cognitive impairment sufficient to interfere with participant's ability to provide assent~* People who are non-English speakers or who have major visual or hearing impairment will be excluded given the need to converse with the Trusted Messenger verbally~* People who have received any of the available forms of the COVID-19 vaccine, or those with a medical exemption for receiving the vaccine.

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

Study Arms:
- Trusted Messenger (Type: EXPERIMENTAL): The trusted messenger patient intervention will involve training a small number of staff trusted messengers to engage patients informally and assist with building vaccine confidence in brief one- on-one sessions, supported by trusted messengers weekly consultations with a content expert who can answer specific vaccine related questions that patients have over a 3-week period. Trusted messengers will be full time unit employees, selected with the assistance of the nursing supervisor for having excellent rapport with patients (assessed with the Nurse Coordinator Questionnaire) and for having been vaccinated. Mental health workers or nurses may serve in this role. Both inpatient units involved in this study will be grouped into the same vaccination cohort within the hospital, to provide patients in the intervention and the wait list similar opportunities to be vaccinated.
- Standard Care (Type: NO_INTERVENTION): After a 3-week study period, up to 24 patients on the second unit will receive the trusted messenger intervention and followed for a period of 3 weeks. The trusted messenger intervention will consist of staff who are trained to engage patients informally and assist building social norms for vaccine uptake supported by weekly and as-needed check-ins with a content expert who can answer specific vaccine related questions over a 3 week period.

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