Background: The coronavirus disease (COVID-19) pandemic is an international public health threat. This study aimed to evaluate COVID-19-related knowledge, preventive behaviors, and risk perception among Saudi Arabian medical students and interns. Materials and Methods: This cross-sectional study was conducted among fourth- and fifth-year medical students and interns between June and August 2020 at three colleges of medicine in Qassim Region, Saudi Arabia. A previously validated questionnaire was distributed as an online survey. Results: The total mean knowledge score was 12.5/15 points; 83.9% achieved a high score. The mean score of self-reported preventive behavior was 8.40; 94.1% achieved a high score. The overall mean risk perception score was 5.34/8 points; 31.6% achieved a high score. Conclusion: Medical students assessed in this study displayed sufficient knowledge and preventive behaviors regarding the COVID-19 pandemic and an average level of risk perception. Lower scores by younger medical students suggest that they must improve their COVID-19 knowledge and risk perception, as they are a potential source of health information in their communities.

Background: Human immunodeficiency virus and acquired immunodeficiency syndrome (HIV/AIDS) is a global health problem. Since Saudi Arabia is becoming more open to the world, it is important to assess future doctors' knowledge, attitudes, and practices (KAPs) regarding HIV/AIDS and people living with HIV (PLHIV). Materials and Methods: This cross-sectional study included 204 male medical students of Qassim University who answered a self-administered questionnaire about HIV KAPs. Results: The mean HIV knowledge (HK) and attitude scores were 11.62 (64.5%) and 37.82 (67.5%), respectively. Positive correlations were observed between HK and attitude (r = 0.266) and HK and academic year (r = 0.277). No significant correlation was found between attitude and academic year (r = 0.097). More than half of the students exhibited ignorance about some modes of transmission such as deep kissing and vertical transmission. Around 81% of the students stated that they would not visit the homes of friends with HIV-infected members. Furthermore, 73.1% of the participants indicated that they would not provide care to HIV-positive relatives in their own homes. Conclusions: The findings show a modest level of HK and negative attitudes toward PLHIV. The study identified the main knowledge gaps in the transmission and prevention of HIV. Educational institutions should tailor their educational approach based on the identified gaps, which might help to ease the stigma and negative attitudes.