Study design
A prospective, randomized, controlled study was conducted in the Ardennes region in 2021. Participants included were those aged 25 years in 2020, residing in the region in June 2021 and who had not had a dTcaP booster vaccine dispensed from a pharmacy between January 1, 2019 and June 1, 2021. Those that were not affiliated with the general French health insurance system were excluded.