Immune Response to Third Dose of COVID-19 Vaccine in Solid Organ Transplant

January 3, 2022 updated by: Pontificia Universidad Catolica de Chile

Immune Response to Third Dose of SARS-CoV-2 Vaccine in a Cohort of Solid Organ Transplant Recipients

The Coronavirus Disease 2019 (COVID-19) pandemic has claimed over 5 million lives globally. Fortunately, a substantial and growing number of SARS-CoV-2 vaccines with very high efficacy have been developed, manufactured, and rapidly approved. Novel mRNA vaccines such as the BNT162b2 (Pfizer-BioNTech) and mRNA-1273 (Moderna) have reported a stunning >94% efficacy against COVID-19. However, global access has not been equitable, with many low- and middle-income countries having no vaccine access or access under emergency use mainly to traditional inactivated SARS-CoV2-2 vaccines such as BBIBP-CorV (Sinopharm Beijing), CoronaVac (Sinovac) and BBV152 (Bharat Biotech). Emerging studies have shown that lower concentrations of neutralizing antibodies (Nab) are attained after CoronaVac than after an mRNA-based vaccine in healthy individuals. This difference seems to be more pronounced in immunocompromised patients who are at higher risk of severe COVID-19 and death from COVID-19. As such, several countries including the United States, Israel and Chile have recommended a third vaccine dose for high-risk populations. However, it is not currently known which is the best vaccine combination regarding immunogenicity, particularly in these vulnerable patients.

This observational study will explore the humoral and cellular response to a SARS-CoV-2 BNT162b2 vaccine booster in solid organ transplant patients who received two previous doses of the inactivated Coronavac or two doses of BNT162b2 vaccines.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Actual)

147

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Chile
      • Santiago, Chile
        • Pontificia Universidad Catolica de Chile

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Solid organ transplant patients in the last 10 years and currently under immunosuppressive therapy

Description

Inclusion Criteria:

  • Solid organ transplant patients in the last 10 years and currently under immunosuppressive therapy
  • Vaccination with two doses of Coronavac vaccine or BNT162b2 vaccines, followed by a booster dose (3d dose) of BNT162b2 vaccine administered in the previous 8-12 weeks.

Exclusion Criteria:

  • Previous SARS-CoV-2 infection
  • Booster vaccine (3rd dose) administered less than 8 weeks or more than 12 weeks before enrolment
  • Intravenous immunoglobulin therapy 60 days before enrolment
  • Previous SARS-CoV-2 vaccine different from CoronaVac or BNT162b2

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Cohort
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Three doses of BNT162b2 vaccine
Solid organ transplant patients who received three doses of BNT162b2
Biological: Three doses of SARS-CoV-2 BNT162b2 vaccine (observational)
Two doses of SARS-CoV-2 BNT162b2 mRNA vaccine, followed by a booster (3rd) dose of SARS-CoV-2 BNT162b2 mRNA vaccine.
Two doses of Coronavac and one of BNT162b2 vaccine
Solid organ transplant patients who received two doses of CoronaVac and one dose of BNT162b2
Biological: Two doses of CoronaVac and one dose of BNT162b2 SARS-CoV-2 vaccine (observational)
Two doses of CoronaVac SARS-CoV-2 inactivated vaccine, followed by a booster (3rd) dose of BNT162b2 mRNA vaccine.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
IgG seropositivity 8-12 weeks after third dose BNT162b2 (booster) vaccine.
Time Frame: 8-12 weeks after booster vaccine
8-12 weeks after booster vaccine

Secondary Outcome Measures

Outcome Measure
Time Frame
Proportion of positive neutralizing antibodies 8 to 12 weeks after third dose BNT162b2 (booster) vaccine.
Time Frame: 8-12 weeks after booster vaccine
8-12 weeks after booster vaccine
Neutralizing geometric mean titers 8 to 12 weeks after third dose of BNT162b2 (booster) vaccine.
Time Frame: 8-12 weeks after booster vaccine
8-12 weeks after booster vaccine

Other Outcome Measures

Outcome Measure
Time Frame
The number of IFN-y-spot forming T cells SARS-CoV-2 specific after third dose of BNT162b2 (booster) vaccine.
Time Frame: 8-12 weeks after booster vaccine
8-12 weeks after booster vaccine

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Pontificia Universidad Catolica de Chile

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

October 6, 2021

Primary Completion (Actual)

December 13, 2021

Study Completion (Actual)

January 3, 2022

Study Registration Dates

First Submitted

November 15, 2021

First Submitted That Met QC Criteria

November 15, 2021

First Posted (Actual)

November 18, 2021

Study Record Updates

Last Update Posted (Actual)

January 12, 2022

Last Update Submitted That Met QC Criteria

January 3, 2022

Last Verified

January 1, 2022

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 210405014E

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

IPD Plan Description

Anonymized IPD may be shared under institutional request if IRB requirements are met.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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