Influenza Vaccine in Lung Transplant Patients - Persistence of Antibodies Beyond the Season
- Registration Number
- NCT04530786
- Lead Sponsor
- University of Wisconsin, Madison
- Brief Summary
This a sub-study of a 5-year study designed to investigate how antibody and T cell responses following influenza vaccine compare among lung transplant patients, patients waiting for lung transplantation, and healthy individuals.
This study is designed to investigate influenza vaccine-induced antibodies in lung transplant patients beyond the season of vaccination.
- Detailed Description
Every year influenza infection causes significant morbidity and mortality in the general population making it a serious public health concern. Among those at highest risk for complications from infection are the immunocompromised. Effective influenza immunization that confers protection throughout the season is critical for lung transplant recipients because in addition to aggressive immunosuppressive therapy, infection directly affects the transplanted organ. Studies of influenza vaccine response rates in lung transplant patients show generally lower antibody concentrations, but acceptable influenza vaccine response rates compared with healthy individuals. However, little is known about the persistence of influenza vaccine-induced antibody concentration in either healthy or immunosuppressed populations.
Influenza antibody concentrations persist at seroprotective levels (defined as antibody concentrations at least 40 hemagglutination units) up to a year post vaccination. However, the investigators could find no information regarding persistence beyond one year.
It is hypothesized that the high rates of persisting influenza vaccine antibody in immunosuppressed lung transplant individuals would match the rates of persisting vaccine-antibody in healthy individuals.
Influenza antibody concentrations against viruses no longer included in the vaccine were measured in serum by hemagglutination inhibition assay (HIA) annually (individual participants followed for 3 years). Samples were collected at 2-4 weeks post-vaccination. Seroprotection was defined as a titer of ≥ 1:40 and was compared between groups over the measured term using Fisher's exact tests.
\[This substudy that was originally registered to NCT00205270 and subsequently registered to its own NCT number for the purpose of clarity in linked results\]
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 100
- Receiving care Post-lung transplant at University of Wisconsin Hospital
- Healthy adult
- Allergy to eggs
- Moderate to severe febrile illness
- Active treatment for acute rejection
- Received season's influenza vaccine prior to enrollment
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Arm && Interventions
Group Intervention Description Vaccine, Post-transplant Influenza vaccine Cohort consist of individuals who have received lung transplants Inactivated influenza vaccine will be administered intramuscularly annually. Vaccine, Healthy Control Influenza vaccine Cohort consists of healthy individuals who received the influenza vaccine Inactivated influenza vaccine will be administered intramuscularly annually.
- Primary Outcome Measures
Name Time Method Antibody response to influenza vaccine season 3 (up to 3 years on study) Influenza antibody concentrations against viruses no longer included in the vaccine were measured in serum by hemagglutination inhibition assay (HIA) annually following vaccination of lung transplant participants and healthy controls.
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (1)
University of Wisconsin
🇺🇸Madison, Wisconsin, United States