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CompletedNCT05113472Updated Nov 9, 2021

Adverse Reactions Following COVID-19 Vaccination Among Ecuadorian Healthcare Workers

An observational study in Adverse Drug Event, sponsored by Respiralab. Completed at 1 site in Ecuador. Open to participants aged 18 Years to 99 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-11-09.

Sponsored by Respiralab · Observational

Study type
Observational
Model
Cohort
Time perspective
Cross-sectional
Enrollment
1,291
Ages
18 Years to 99 Years
Sex
All
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Study summary

Limited large-scale studies have been conducted to investigate the adverse effects of COVID-19 vaccine in Latin America, particularly among the healthcare worker (HCW) population in Ecuador. The objective of this study was to assess a cohort of Ecuadorian healthcare workers for adverse reactions following vaccination with the Pfizer-BioNTech vaccine.

Read the detailed description

The COVID-19 pandemic bears a burden on medical care and economies worldwide, however immunization at the population level provides a way for to reduce future morbidity and mortality. Vaccine hesitancy and reluctance in getting the COVID-19 vaccine and apprehensions about them have been present along the course of vaccination programs and mass immunizations across the world. Factors such as the quick, large-scale production of vaccines, lack of information, and uncertainty about adverse reactions in the public's eye as well about myths spreading through media channels have given rise to suspicion and fear in the Latin American population. Limited large-scale studies have been conducted to investigate the adverse effects of COVID-19 vaccine in Latin America, particularly among the healthcare worker (HCW) population in Ecuador. The objective of this study was to assess a cohort of Ecuadorian healthcare workers for adverse reactions following vaccination with the Pfizer-BioNTech vaccine.

02

Conditions studied

  • Adverse Drug Event

Keywords

  • adverse reactions
  • COVID-19
  • healthcare workers
  • Latin America
  • vaccination
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In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's enrollment of 1,291 is above the median of 261 across 3,136 observational studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

Respiralab is the lead sponsor of 3 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years to 99 Years
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Non-probability sample

Study population

The population included Ecuadorian healthcare workers who received the inoculation with the Pfizer-BioNTech COVID-19 vaccine.

Inclusion criteria

  • Ecuadorian nationality
  • Active practice in the medical field
  • Received the Pfizer-BioNTech COVID-19 vaccine

Exclusion criteria

Exclusion Criteria:

  • Patients who voluntarily refused to participate.
05

Study design

Observational model
Cohort
Time perspective
Cross-sectional
Enrollment
1,291 participants (actual)
Patient registry
No

Groups and cohorts

  • Ecuadorian Healthcare Workers

    All individuals involved were part of the first phase of the national COVID-19 vaccination plan in our country and were contacted through a local registry established by a local private university.

    Biological: Pfizer-BioNTech COVID-19 vaccine

Interventions

  • BiologicalPfizer-BioNTech COVID-19 vaccine

    Patients who were administered any dose of the Pfizer-BioNTech COVID-19 vaccine.

06

What researchers measure

Primary outcomes

  1. Adverse reactions

    Pain, erythema, edema, pruritus, axillary edema, fever, cephalea, malaise, arthralgia, nausea, diarrhea, chills, fatigue, somnolence, syncope, paresthesia, anxiety, dizziness, epigastric pain, generalized rash, generalized pruritus, allergic rhinitis, petechiae, throat itchiness, allergic sinusitis, facial edema, bronchospasm, allergic conjunctivitis, dermatitis, eczema, ocular edema, urticaria, lip swelling, tongue swelling, facial rash, anaphylaxis.

    Time frame: 14 days since administration of either dose

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Study locations

1 site
  • Universidad Espiritu Santo
    Samborondon, 092301, Ecuador
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References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 9, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT05113472
Lead sponsor
Respiralab
Responsible party
Sponsor
First posted
Nov 9, 2021
Start date
Mar 1, 2021
Primary completion
May 31, 2021
Completion
May 31, 2021
Last update
Nov 9, 2021

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Nov 2021. You cannot join it, but the record below documents what was studied.

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