COVID-19 vaccine reactogenicity among participants enrolled in the GENCOV study

Vaccine. 2024 Apr 19;42(11):2733-2739. doi: 10.1016/j.vaccine.2024.03.030. Epub 2024 Mar 23.

Abstract

Background: GENCOV is a prospective, observational cohort study of COVID-19-positive adults. Here, we characterize and compare side effects between COVID-19 vaccines and determine whether reactogenicity is exacerbated by prior SARS-CoV-2 infection.

Methods: Participants were recruited across Ontario, Canada. Participant-reported demographic and COVID-19 vaccination data were collected using a questionnaire. Multivariable logistic regression was performed to assess whether vaccine manufacturer, type, and previous SARS-CoV-2 infection are associated with reactogenicity.

Results: Responses were obtained from n = 554 participants. Tiredness and localized side effects were the most common reactions across vaccine doses. For most participants, side effects occurred and subsided within 1-2 days. Recipients of Moderna mRNA and AstraZeneca vector vaccines reported reactions more frequently compared to recipients of a Pfizer-BioNTech mRNA vaccine. Previous SARS-CoV-2 infection was independently associated with developing side effects.

Conclusions: We provide evidence of relatively mild and short-lived reactions reported by participants who have received approved COVID-19 vaccines.

Keywords: COVID-19; Reactogenicity; SARS-CoV-2; Vaccine safety.

Publication types

  • Observational Study

MeSH terms

  • Adult
  • COVID-19 Vaccines* / adverse effects
  • COVID-19* / prevention & control
  • Humans
  • Ontario / epidemiology
  • Prospective Studies
  • SARS-CoV-2

Substances

  • COVID-19 Vaccines