This issue has been available online since 30 June 2023 the regular issue of June 2023. All articles in this issue (6 original research articles) were authored/co-authored by 17 authors from from 8 institutions from 3 countries (Indonesia, Nigeria, and South Africa), i.e., Institute Technology of Bandung (Indonesia), University of the Western Cape (South Africa), Bandung Islamic University (Indonesia), Sulianti Saroso Infectious Disease Hospital (Indonesia), Delta State University (Nigeria), Walter Sisulu University (South Africa), Durban University of Technology (South Africa), University of Zululand (South Africa).