biostudies-literatureUnknown99Vallone MG<h4>Importance</h4>The actual risk of thrombotic events after Covid-19 vaccination is unknown.<h4>Objective</h4>To evaluate the risk of thrombotic events after Covid-19 vaccination.<h4>Design</h4>Retrospective cohort study which included consecutive adult patients vaccinated with the first dose of Covid-19 vaccine between January 1 and May 30, 2021, and a historic control group, defined as consecutive patients vaccinated with influenza vaccine between March 1 and July 30, 2019.<h4>Setting</h4>Hospital Italiano de Buenos Aires, a tertiary hospital in Argentina.<h4>Participants</h4>Non-Hospitalized Adults vaccinated with the first dose of a Covid-19 vaccine.<h4>Exposure</h4>Vaccination with Covid-19 vaccines available during the study period: Gam-COVID-Vac (Sputnik), ChAdOx1 nCoV-19 (AstraZeEuropean journal of internal medicine82-88https://www.ebi.ac.uk/biostudies/studies/S-EPMC8904150biostudies-literatureThrombotic events following Covid-19 vaccines compared to Influenza vaccines.PMC8904150Ratti MFGStaneloni MIFerraris AMezzarobba DCastro HMCantarella RFVazquez FJAliperti VIFerloni AFalcon ALVallone MGfalseThrombotic events following Covid-19 vaccines compared to Influenza vaccines.<h4>Importance</h4>The actual risk of thrombotic events after Covid-19 vaccination is unknown.<h4>Objective</h4>To evaluate the risk of thrombotic events after Covid-19 vaccination.<h4>Design</h4>Retrospective cohort study which included consecutive adult patients vaccinated with the first dose of Covid-19 vaccine between January 1 and May 30, 2021, and a historic control group, defined as consecutive patients vaccinated with influenza vaccine between March 1 and July 30, 2019.<h4>Setting</h4>Hospital Italiano de Buenos Aires, a tertiary hospital in Argentina.<h4>Participants</h4>Non-Hospitalized Adults vaccinated with the first dose of a Covid-19 vaccine.<h4>Exposure</h4>Vaccination with Covid-19 vaccines available during the study period: Gam-COVID-Vac (Sputnik), ChAdOx1 nCoV-19 (AstraZe2022-01-01T00:00:00Z2022 May2025-04-26T03:54:49.993Z2025-02-18T22:43:02.99ZS-EPMC89041503528803110.1016/j.ejim.2022.03.002