The online material
COLD
The intervention included teaching the immunization program through an online educational video based on Bandura’s theory of self-efficacy. This educational video was prepared by the research group of Health faculty based on the Immunization handbook of the Iranian Ministry of Health and Medical Education and World Health Organization (WHO) instructions, which included two general sections:A) Importance of vaccination, familiarity with cold chain equipment, familiarity with cold chain monitoring tools, knowledge of different types of vaccines, their nature, and location in the refrigerator.B) Practical training of vaccination interactively based on the theory of self-efficacy, including all the necessary skills for injecting different types of vaccines, including familiarity with how to inject different types of vaccines, familiarity with the appropriate time, dose, place, and angle of each vaccine and how to communicate properly with children at the time of vaccination.All the processes were performed gradually with the help of a health center staff. All the steps were filmed. In order to make this educational video, the relevant scenario was first prepared by the research group, and after its scientific approval by the professors of the Faculty of Health, it was directed and the video was filmed using a professional team.