Please assess the completion status of the following clinical trial:

Trial Title: Vaccination Response in Individual Monozygotic Twins

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_CONTROL
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~Volunteers are eligible to participate in this study if both they and their twin sibling have agreed to participate. If after their enrollment in the study, one of the twin siblings decides to withdraw, then:~1. If one sibling withdraws during Year 1, the other sibling will be allowed to continue their participation in the study and to complete the current study Year. However they will not be included in the randomly selected applicants that will continue participation in Year 2 of the study.~2. If one sibling withdraws duringYear2, the other sibling will be able to conclude Year2 study activities. -~Exclusion Criteria:~1. Volunteer is under18.~2. Presence of any medical conditions that the study investigators believe will affect participation in the study or its results.~3. Presence of a mental incapacity and/or cognitive impairment that would prevent a subject from adequately understanding, or cooperating with, the study protocol.~4. Volunteers with any severe allergies (life-threatening) or that have ever had a life-threatening allergic reaction after a dose of flu vaccine, or have a known severe allergy to any part of this vaccine, will be advised not to participate.~5. If a potential subject has ever had Guillain-Barré Syndrome (a severe paralyzing illness, also called GBS), they will be advised not to get the influenza vaccine and be excluded from this study.~   * For female participants If they are already enrolled and become pregnant during this study, the investigators will temporarily withdraw them from the study from the day they become pregnant. If they would like to stay in the study, the investigators may continue their participation after their delivery.~  * If participants are not feeling well on the scheduled day of vaccination the investigators will suggest that they postpone the vaccination until they feel better. If they agree, the vaccination will be re-scheduled for a later date.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 80 Years
- Healthy Volunteers: t

Study Arms:
- Asthma Discordant Monozygotic Twins (Type: None): This is a group where one of the monozygotic twins has asthma and the other is non-asthmatic. Influenza Vaccination will be performed for both cohorts.
- Non-Asthma Concordant Monozygotic Twins (Type: None): This is a group where both of the monozygotic twins are non-asthmatic. Influenza Vaccination will be performed for both cohorts.

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