Please assess the completion status of the following clinical trial:

Trial Title: The Immediate and Longterm Immune Responses of UK Infants and Young Children to a Booster Dose of Hib Vaccine

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

Eligibility Criteria:
Inclusion Criteria:~* Written informed consent from parent or legal guardian of the infant or child~* Age \>= 9 months and \<4 years at recruitment~* Eligible to receive a single dose of Hib vaccine as per the UK schedule~* Receipt of three doses of Hib vaccine in infancy~Exclusion Criteria:~* History of Hib infection~* History of severe local reaction that can be confidently related to a prior Hib immunisation~* Deferral of vaccination if acute illness and/or temperature \>38C on day of vaccination

- Gender: ALL
- Minimum Age: 9 Months
- Maximum Age: 4 Years
- Healthy Volunteers: t

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