COVID-19 Vaccination of Immunodeficient Persons (COVAXID) (COVAXID)

November 20, 2025 updated by: Soo Aleman, Karolinska University Hospital

Immunological Responses After Vaccination for COVID-19 With the Messenger Ribonucleic Acid (mRNA) Vaccine Comirnaty in Immunosuppressed and Immunocompetent Individuals. An Open and Non-randomized, Phase IV Multicenter Study

The study is designed as an open, non-randomized, phase IV cohort study in which the mRNA vaccine Comirnaty will be given in two doses. Analyses will be performed on blood and saliva, investigating humoral and cellular vaccine responses. Occurence of local or systemic reactogenicity will be evaluated, as well as adverse events. The study will include persons with primary or secondary immunosuppressive disorders, as well as immunocompetent persons, with the aim of investigating if the immune responses after given Comirnaty mRNA vaccine against COVID-19.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

In this study with 450 patients with primary or secondary immunosuppressive disorders (patients with primary immunodeficiency, HIV infected patients, patients with allogenic stem cell transplantation/CAR T cell treated, solid organ transplanted, and patients with chronic lymphatic leukemia) from Karolinska University Hospital, and healthy controls of 90 individuals for comparison, we will investigate the safety and the immune responses after mRNA vaccination with Comirnaty after two doses, under 6 months of time for each participant. The study is In collaboration with research groups at Karolinska Institutet and SciLifeLab, with planned in-depth detailed analyses of antibody responses as well as cellular responses. The study has obtained permission from Swedish Medical Agency and Swedish Ethical Review Authority.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
539

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

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

  • Sweden
    • Huddinge
      • Stockholm, Huddinge, Sweden, 14186
        • Karolinska University Hospital

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

1. Individuals ≥18 years old

2a. In the opinion of the investigator, individuals with immunosuppressive disease who meet one of the following criteria:

  • Primary immunodeficiency
  • Human immunodeficiency virus (HIV)-infection
  • Allogeneic stem cell transplantation / Chimeric antigen receptor (CAR T cell) therapy
  • Solid organ transplant
  • Chronic lymphatic leukemia

or

2b. In the opinion of the investigator, individuals without immunosuppressive disease or treatment without significant co-morbidity

3. Provision of signed informed consent to participate in the study

Exclusion Criteria:

  1. Previous or ongoing Coronavirus Disease-19 (COVID-19).
  2. Coagulation disorders, other conditions associated with prolonged bleeding time or anticoagulant treatments, which according to the investigator contraindicate intramuscular injection. Conditions which can be corrected with measures such as platelet concentrate treatments, coagulation factors or other measures for people responsible for anticoagulants are not exclusion criteria.
  3. Planned to receive another vaccine within 14 days before the first dose of the study vaccine, or during the period from the first dose of the study vaccine up to 14 days after the second dose of the study vaccine, and vaccination with another vaccine which in the investigator's opinion cannot be planned outside these time periods
  4. Pregnancy or breast feeding.
  5. Hypersensitivity to the active substance or to any of the excipients contained in the vaccine
  6. Individuals who cannot understand the informed consent.
  7. Individuals who for other reasons are considered by investigators as not suitable for inclusion

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

  • Primary Purpose: Prevention
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Vaccination with Comirnaty according to standard of care treatment
All study participants will receive Comirnaty according to current approval.
Biological: Comirnaty (COVID-19, mRNA vaccine)
Comirnaty will be administered two times, one at Day 0 and the second dose at Day 21.
Other Names:
  • tozinameran
  • Pfizer mRNA vaccine

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Assessment of Seroconversion, Defined as Development of Immunoglobulin G (IgG) Antibodies Against Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) After Vaccination of 2 Doses in Seronegative Individuals.
Time Frame: 2 weeks after second dose of vaccine.
Proportion (95% confidence interval, CI) seroconverting to positive response to SARS-CoV-2 IgG serology test after two doses of vaccine, measured 2 weeks after second dose of vaccine.
2 weeks after second dose of vaccine.

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Assessment of Any Adverse Events (AE) of the Given Vaccine.
Time Frame: Duration of 0-14 days after the first vaccine dose.
Proportion (95% CI) who experience adverse events, with AE/SAE/SUSAR (after dose 1)
Duration of 0-14 days after the first vaccine dose.
Assessment of Any Adverse Events (AE) of the Given Vaccine.
Time Frame: Duration of 0-14 days after the second vaccine dose.
Proportion (95% CI) who experience adverse events, with AE/SAE/SUSAR (after dose 2)
Duration of 0-14 days after the second vaccine dose.
Frequency Who Experience Local and Systemic Reactions
Time Frame: After the first vaccin dose
Number and proportion (95% CI) who experience local and systemic reactions (after dose 1)
After the first vaccin dose
Frequency Who Experience Local and Systemic Reactions
Time Frame: After the second vaccin dose
Number and proportion (95% CI) who experience local and systemic reactions (after dose 2)
After the second vaccin dose
Frequency of SARS-CoV-2 Infection Documented by PCR Test.
Time Frame: 0 - 6 months
Proportion (95% CI) diagnosed with a new SARS-CoV-2 infection confirmed by a positive PCR test
0 - 6 months

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Karolinska University Hospital

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Karolinska Institutet

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Soo Aleman, MD, PhD, Karolinska University Hospital, ME Infectious Diseases

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)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
February 23, 2021

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 15, 2021

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
May 8, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 19, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 2, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
March 3, 2021

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 4, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 20, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2021-000175-37

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Will submit data to European Union Drug Regulating Authorities Clinical Trials Database (EudraCT) and share data result. Will share research results and data through national COVID-19 data portal, operated by SciLifeLab Data Centre, Sweden.

IPD Sharing Time Frame

Within one year after study end.

IPD Sharing Access Criteria

Published in EudraCT and national COVID-19 data portal (SciLifeLab Data Centre)

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

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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