A Real-world Evidence Study of BNT162b2 mRNA Covid-19 Vaccine in Brazil

November 3, 2023 updated by: Hospital Moinhos de Vento

Effectiveness of Pfizer-BioNTech BNT162b2 mRNA COVID-19 Vaccine on Symptomatic SARS-CoV-2 Infection and COVID-19-related Hospitalizations, Mortality, and Long-term Consequences in Brazil: a Real-world Evidence Study

The present test-negative design study aims to estimate the real-world effectiveness of Pfizer-BioNTech BNT162b2 mRNA vaccine on symptomatic SARS-CoV-2 infection and its consequences following a mass vaccination campaign in the city of Toledo in Southern Brazil.

Individuals aged 12 years or older who seek the public healthcare system with symptoms suggestive COVID-19 will be enrolled. Participants with a positive polymerase chain reaction (PCR) test for SARS-CoV-2 will be classified as cases, and those with negative PCR test for SARS-CoV-2 will be classified as controls. Cases will be followed-up for a period of one year by means of structured telephone interviews.

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.

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.
Observational

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.
4574

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Brazil
    • PR
      • Toledo, PR, Brazil
        • Unidade Básica de Saúde Jardim Cosmos
      • Toledo, PR, Brazil
        • Unidade de Pronto Atendimento Pediátrico Dr. José Ivo Alves da Rocha
    • Paraná
      • Toledo, Paraná, Brazil
        • Pronto Atendimento Municipal de Toledo

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

12 years and older (Child, Adult, Older Adult)

Accepts Healthy Volunteers

N/A

Sampling Method

Non-Probability Sample

Study Population

The present study population will be composed by individuals aged 12 years or older who seek the public healthcare system of Toledo city with symptoms suggestive COVID-19. Participants with a positive polymerase chain reaction (PCR) test for SARS-CoV-2 will be classified as cases, and those with negative PCR test for SARS-CoV-2 will be classified as controls.

Description

Inclusion Criteria:

  • Age ≥ 12 years old;
  • Resident of Toledo city;
  • Seeking care in the public healthcare system with symptoms suggestive of COVID-19 defined as follows: 1) ARI symptoms (nasal congestion, rhinorrhea, anosmia, sore throat, hoarseness, new or increased-from-baseline cough, sputum production, dyspnea, wheezing, myalgia) OR 2) Admitting diagnosis suggestive of ARI (pneumonia, upper respiratory infection, bronchitis, influenza, cough, asthma, viral respiratory illness, respiratory distress, AND/OR respiratory failure).
  • Nasal sample for SARS-CoV-2 diagnosis obtained as standard of care.

Exclusion Criteria:

  • SARS-CoV-2-directed antiviral treatment within the past 30 days;
  • COVID-19 monoclonal antibody therapy within the past 90 days;
  • COVID-19 convalescent serum therapy within the past 90 days;
  • Lack of consent to participate.

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: Case-Control
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
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.
Fully vaccinated with BNT162b2 COVID-19 vaccine
Defined as 2 doses of Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine received with ≥7 days between receipt of the 2nd dose and acute respiratory illness (ARI) symptom onset. This group will serve as the 'exposed' group evaluated in the primary objective.
Drug: Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Ever vaccinated with BNT162b2 COVID-19 vaccine
defined as ≥1 dose of Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine received with ≥14 days between receipt of the 1st dose and ARI symptom onset.
Drug: Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Partially vaccinated with BNT162b2 COVID-19 vaccine
Defined as 1 dose (only) of Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine received with ≥14 days between receipt of the 1st dose and ARI symptom onset.
Drug: Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Fully vaccinated with other available COVID-19 vaccines
Defined as fully vaccinated with available COVID-19 vaccines other than the BNT162b2 according to the manufacturer recommendations.
Drug: CoronaVac COVID-19 vaccine
CoronaVac COVID-19 vaccine
Drug: ChAdOx1 nCoV-19 Covid-19 Vaccine
ChAdOx1 nCoV-19 Covid-19 Vaccine
Drug: Ad26.COV2.S COVID-19 Vaccine
Ad26.COV2.S COVID-19 Vaccine
Never vaccinated
Defined as never received any COVID-19 vaccine. This group will serve as the reference exposure group (i.e., 'unexposed' group) in all vaccine effectiveness analyses.
Fully vaccinated plus booster dose of BNT162b2 COVID-19 vaccine
Defined as fully vaccinated with available COVID-19 vaccines according to the manufacturer recommendations plus booster dose of BNT162b2 COVID-19 vaccine received with ≥14 days between receipt of the 1st dose and ARI symptom onset.
Drug: Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine
Drug: CoronaVac COVID-19 vaccine
CoronaVac COVID-19 vaccine
Drug: ChAdOx1 nCoV-19 Covid-19 Vaccine
ChAdOx1 nCoV-19 Covid-19 Vaccine
Drug: Ad26.COV2.S COVID-19 Vaccine
Ad26.COV2.S COVID-19 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
Odds of symptomatic SARS-CoV-2 infection
Time Frame: At the moment of enrollment
Odds of symptomatic SARS-CoV-2 infection defined by the presence of symptoms suggestive COVID-19 with a positive PCR test for SARS-CoV-2. Symptoms suggestive of COVID-19 are defined as follows: 1) Acute respiratory illness symptoms (nasal congestion, rhinorrhea, anosmia, sore throat, hoarseness, new or increased-from-baseline cough, sputum production, dyspnea, wheezing, myalgia) OR 2) Admitting diagnosis suggestive of ARI (pneumonia, upper respiratory infection, bronchitis, influenza, cough, asthma, viral respiratory illness, respiratory distress, AND/OR respiratory failure).
At the moment of enrollment

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
Odds of symptomatic SARS-CoV-2 infection due to Gamma variant
Time Frame: At the moment of enrollment
Odds of symptomatic SARS-CoV-2 infection due to Gamma variant defined by the presence of symptoms suggestive COVID-19 with a positive PCR test for SARS-CoV-2 Gamma variant
At the moment of enrollment
Odds of symptomatic SARS-CoV-2 infection due to other circulating variants of concern
Time Frame: At the moment of enrollment
Odds of symptomatic SARS-CoV-2 infection due to other circulating variants of concern defined by the presence of symptoms suggestive COVID-19 with a positive PCR test for SARS-CoV-2 Alfa, Beta, or Delta variant
At the moment of enrollment
Duration of COVID-19 symptoms
Time Frame: within 180 days from enrollment
Length of COVID-19-related symptoms
within 180 days from enrollment
Incidence of hospitalization due to COVID-19
Time Frame: Within 30 days from enrollment
Incidence of hospital admission due to COVID-19
Within 30 days from enrollment
Incidence of ICU admission
Time Frame: Within 30 days from enrollment
Incidence of ICU admission
Within 30 days from enrollment
Incidence of mechanical ventilation
Time Frame: Within 30 days from enrollment
Incidence of invasive mechanical ventilation
Within 30 days from enrollment
Mortality due to COVID-19
Time Frame: Within 90 days from enrollment
Incidence of COVID-19-related mortality
Within 90 days from enrollment
Utility score of health-related quality of life at 3 months
Time Frame: 90 days after enrollment
Utility score of health-related quality of life assessed with the EuroQol- 5 dimensions 3-level questionnaire. The utility score derived from the descriptive system for the Brazilian population ranges from -0.176 (indicating the worst health status [serious problems in all domains]) to 1.0 (indicating the best health status [no problems at all])
90 days after enrollment
Prevalence of long COVID-19 symptoms at 6 months
Time Frame: 180 days after enrollment
Incidence of long COVID-19-related symptoms (fatigue, muscular weakness, dyspnea, cough, loss of taste or smell, concentration or memory difficulties, sleep disorders, headache, anxiety, and depression)
180 days after enrollment
Incidence of new symptomatic COVID-19 infection
Time Frame: 365 days from enrollment
Incidence of new symptomatic COVID-19 infection defined as recurrence of COVID-19-related symptoms with a positive PCR test for SARS-CoV-2 90 days after the index infection
365 days from enrollment
Incidence of any vaccine-related adverse event
Time Frame: 365 days from enrollment
Incidence of any vaccine-related adverse event including local pain, hyperemia or necrosis; fever; fatigue; headache; myalgia; arthralgia; vomiting; diarrhea; and other symptoms
365 days from enrollment
Incidence of vaccine-related severe adverse event
Time Frame: 365 days from enrollment
Incidence of any adverse event that result in death, hospitalization or prolongation of hospitalization, and persistent or significant disability
365 days from enrollment

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.
Hospital Moinhos de Vento

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.
Pfizer
Universidade Federal do Paraná
Inova Medical

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: Regis G Rosa, MD, PhD, Hospital Moinhos de Vento
  • Principal Investigator: Maicon Falavigna, MD, PhD, Hospital Moinhos de Vento

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.
November 3, 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.
June 20, 2022

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.
July 20, 2023

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).
September 17, 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.
September 21, 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.
September 22, 2021

Study Record Updates

Last Update Posted (Actual)

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.
November 7, 2023

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 3, 2023

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.
February 1, 2023

More Information

Terms related to this study

Keywords

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.
  • BNT162b2 in Toledo, Brazil

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

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.

Clinical Trials on Covid19

Clinical Trials on Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings