Intervention
The educational video was shown to intervention group students via Navid (an online education site of medical science universities in Iran, which was launched during the Cocid-19 pandemic), two sessions a week, for two weeks. The duration of each session was two hours.The video was prepared interactively in which, after the training, the students were asked to practice the educated skills themselves, then the video was stopped by the instructor, and each student carried out the requested activity online. Their feedback helped the instructors to resolve their problems. The training videos were 30 minutes long. For better management of sessions, the number of participants in each online session was 15 (each session was repeated 4 times). All the students were advised to prepare syringes and vials and use dolls to practice injecting vaccination at home.The students of the control group had trained in immunization and vaccination in person at health centers, in the previous semester.