2.1 Study design, setting and participants
This is a report on an ongoing nationwide survey of perceptions and attitudes about COVID-19 vaccines, conducted among people aged 18 and over, living in Brazil. The study uses social media as a recruitment platform and the survey will remain open until December, 2021 to capture temporal trends. This study has been conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving research study participants were approved by the UFSCar’s Research Ethics Committee (Number: 45530521.2.0000.5504). Electronic informed consent was obtained from all subjects.