Please assess the completion status of the following clinical trial:

Trial Title: ZOSTAVAX™ Safety Study in Subjects ≥ 60 Years of Age (V211-020)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* 60+ years of Age~* Signed an informed consent prior to the start of study~* Non-Feverish, (less than 101.0°F / 38.3°C) on day of vaccination~* Females must be postmenopausal or have a negative pregnancy test~Exclusion Criteria:~* A history of allergic reaction to any vaccine component (including gelatin or neomycin)~* Prior receipt of any varicella or zoster vaccine~* Any live virus vaccine administered within 4 weeks before the start of the study or scheduled during the 42 days after vaccination~* Any inactivated virus vaccine, except for flu vaccine, administered within 7 days before the start of the study or scheduled during the 42 days after vaccination~* Subject is pregnant or breastfeeding~* Participation in an investigational drug or vaccine study within the last 30 days prior to the start of the study or expected during the 42 days after vaccination~* An ongoing illness (including active untreated tuberculosis) that might interfere with or prevent the subject from completion of the study~* Use of immunosuppressive therapy. Subjects taking corticosteroids such as prednisone should be excluded. Excluded immunosuppressive therapies also include chemotherapeutic agents used to treat cancer or other conditions, and treatments associated with organ or bone marrow transplantation~* Known or suspected immune dysfunction that is caused by a medical condition or any other cause. Examples of medical conditions associated with immune dysfunction include congenital immunodeficiency, human immunodeficiency virus (HIV) infection, organ or bone marrow transplantation, leukemia, lymphoma, Hodgkin's disease, multiple myeloma, or generalized malignancy. Subjects with a history of cancer who are not on active treatment and are not thought to have a weakened immune system at the time of enrollment will be eligible~* Any active use of non-topical antiviral therapy including but not limited to acyclovir, famciclovir, valacyclovir, ganciclovir, foscarnet, brivudine, and cidofovir

- Gender: ALL
- Minimum Age: 60 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- 1 (Type: EXPERIMENTAL): Arm 1: vaccine
- 2 (Type: PLACEBO_COMPARATOR): Arm 2: Placebo Comparator

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