A granulomatous, chronic infectious disease which is called leprosy is caused by intracellular bacilli Mycobacterium leprae. Which attacks Schwann cells and macrophages Leprosy, commonly known as Hansen's disease, is an infection brought on by the slow-growing bacterium Mycobacterium leprae. It may have an impact on the nose, skin, eyes and distal nerves. The condition can be cured with early detection and urgent treatment. Hansen's disease patients are still able to work and maintain an active lifestyle both during and after therapy finally, if the nerve damage is not treated, it can lead to blindness, numbness and the paralysis of the hands and feet .

Background: Viral hepatitis is a blood-borne liver infection that is caused by the Hepatitis B virus (HBV). It is preventable disease through immunization.Medical students are at higher risk of HBV contraction due to occupational exposure. Objective: The aim of the study is to assess the knowledge and awareness of Hepatitis B (Hep B) vaccination and vaccination compliance among the students of health colleges of Al-Baha University. Methods: A crosssectional quantitative study was carried out using a close-ended survey of 394 medical students at Al-Baha University and the collected data was statistically analyzed using the SPSS tool. Results: The descriptive analysis revealed that more of the participants were males (73%) than females (26.9%). Most of the participants (92%) were not infected with HBV. About 50% reported not receiving HBV vaccination. In terms of awareness among respondents, 43.60%were not aware of the length of dosses that they need to achieve full immunity while 57.11% were aware of the protection of vaccine against HBV infection. About, 71.07% of the respondents think of Hep B as liver disease and are aware of its immunization as a preventive measure. However, some participants (44%) were not aware of symptomless HBV. Conclusion: HBV is a complicated viral infection. The knowledge of vaccination was not enough among students of Al-Baha University and therefore, it is recommended to increase the awareness and knowledge of medical students as they are at higher risk of contracting HBV infection.