International Journal of Health Sciences Available online at www.sciencescholar.us Vol. 6 No. 2, August 2022, pages: 771-788 e-ISSN: 2550-696X, p-ISSN: 2550-6978 https://doi.org/10.53730/ijhs.v6n2.7991 771 The Changes of Level of Knowledge, Perception, and Behaviour of Secondary School Students on HIV/AIDS in Penang: Pre and Post Intervention Farhana Kamarul Bahrin a , Azlinda Azman b Manuscript submitted: 11 January 2022, Manuscript revised: 26 March 2022, Accepted for publication: 01 May 2022 Corresponding Author a Abstract The objective of this study is to analyze the level of knowledge, perceptions, and behavior of school adolescents on HIV/AIDS before and after the application of the HIV AIDS intervention module. This study involved 600 students aged 15, 16, and 17 years old in Penang, through three sessions involving pre-test, intervention, and post-test. The results showed that there were positive changes in the level of knowledge, perceptions, and behaviors of the respondents after the intervention process was carried out using the modules. The hypothesis test for knowledge has shown that there is a change in the level of knowledge of the respondents after receiving information on HIV/AIDS (t = -46.561, sig. <0.05, and post knowledge’s mean was 13.813 is higher than pre knowledge’s mean, 8.715). In terms of behavior, there was also a change in the negative behavior of the respondents after information sharing interventions on HIV/AIDS (t = -8.716 and sig. <0.05, and post behavioral’s mean was 4.067, higher than the pre behavioral mean). The hypothesis test for perception aspects also shows that there is a change in the respondents' negative perceptions after receiving the module intervention on HIV/AIDS (t = - 15.146 and sig. <0.05 and post perception’s mean was 3.343, higher than the pre perception’s mean, 3.141). This study has suggested that the early intervention on HIV/AIDS knowledge be conducted in secondary schools in Malaysia as a form of intervention to ensure that the adolescents have sufficient knowledge about HIV/AIDS. Keywords community health; HIV/AIDS education; HIV/AIDS knowledge; social work; International Journal of Health Sciences © 2022. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/). Contents Abstract ............................................................................................................................................................................................................ 771 1 Introduction ............................................................................................................................................................................................ 772 a Social Work Programme, School of Social Sciences, Universiti Sains Malaysia, Malaysia b Social Work Programme, School of Social Sciences, Universiti Sains Malaysia, Malaysia