Objective: The main objective of the study is to evaluate vaccination coverage and the prevalence of vaccine-preventable illnesses in Saudi Arabia's adult population.

Methods: A cross-sectional study was conducted to assess the knowledge, attitudes, and practices regarding adult vaccinations among members of the community in Saudi Arabia. Data were collected through a structured questionnaire that included demographic information, medical history, and vaccine-related questions. The questionnaire was distributed both electronically and in paper form to ensure access to a diverse sample.

Results: The study included 630 participants. The study included 630 participants. The most frequent age among them was 18-29 years (n= 259, 41.1%), followed by 40-49 years (n= 164, 26%), then 50-59 years (n=111, 17.6%).  The most frequent gender among study participants was female (n=450, 71.4%), followed by male (n=180, 28.6%). The most frequent region among study participants was central (n= 264, 41.9 %), followed by western (n= 152, 24.1%), then northern (n=90, 14.3%), and outside the kingdom (n=79, 12.5%). Occupation of study participants, most of them were Government Employees (n=173, 27.5%), followed by students (n=134, 21.3%), then the Privet sector (n=126, 20%), and unemployed (n=113, 17.9%).  Monthly income of study participants, with most of them less than 3,000 (n= 303, 48.1%), followed by 10,000–14,999 (n= 151, 24%%), and then 6,000–9,999 (n=103, 16.3%), the least monthly income was 3,000–5,999 (n= 73, 11.6%). Participants were asked Do you regularly visit a healthcare provider (at least once per year). Most of the participants answered yes (n=330, 52.4%), followed by no (n=300, 47.6%). Participants were asked, Have you ever refused or delayed a recommended adult vaccine Most of the participants answered no (n=478, 75.9%), followed by yes (n=152, 24.1%). Participants were asked whether they would be willing to receive an adult if provided for free at their nearest health center. The majority responded maybe (n = 287, 45.6%), followed by yes (n = 251, 39.8%), while a smaller proportion answered no (n = 92, 14.6%).

Conclusion: The results indicate a strong statistically significant association between willingness to receive adult vaccines and several demographic and health-related characteristics of the participants.