NCT04979416.

Study name	Video messages and vaccination intention
Starting date	28 July 2021
Contact information	Mireille Jacobson, mireillj@usc.edu
Methods	Study design: randomised controlled trial Type of publication: trial registration Setting: online (Prolicif.co panel) Country: USA Language: NR
Intervention	Video messaging video message 1‐3 (video messages aimed at increasing vaccination) control: no video message
Population	Population: general population Inclusion criteria: 18 years and older, adults in the Prolific.co panel, unvaccinated against COVID‐19 Exclusion criteria: indicated to Prolific.co that they have received a COVID‐19 vaccination
Outcomes	Vaccine intention (probability of getting vaccinated in the next 30 days)
Estimated completion date and number of participants	22 July 021 1000 planned
Notes	COI: NR Funding: University of Southern California