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Crystal Amiel M. Estrada, RMT, MPH, PhD
Associate Professor
Department of Environmental and Occupational Health

DDr. Crystal Amiel M. Estrada is a graduate of the Bachelor of Science in Public Health and Master of Public Health of the College of Public Health, University of the Philippines Manila. She completed her Doctor of Philosophy in Health Sciences and also received the University President’s Award at the University of the Ryukyus in Okinawa, Japan.

After obtaining her undergraduate degree, she served as a research assistant to the five-year research program “Prevention and Control of Leptospirosis in the Philippines (LEPCON)”, a research collaboration of the Department of Medical Microbiology College of Public Health University of the Philippines Manila, DOST PCHRD, and JICA. She also served as the Faculty Head of the School of Medical Technology of Global Innovative College. Aside from her current duties as faculty of the department, she is also a member of the Osaka University UNESCO Chair in Global Health and Education.

Dr. Estrada has attended local and international conferences, seminars, and workshops on public health, global health, school health, and mental health. Her research engagements and interests are on school health and occupational health, with a focus on mental health.



  • Estrada, C.A.M., Usami, M., Satake, N., Gregorio, E., Leynes, C., Balderrama, N., de Leon, J., Concepcion, R., Timbalopez, C., Tsujii, N., Harada, I., Masuya, J., Kihara, H., Kawahara, K., Yoshimura, Y., Hakoshima, Y. & Kobayashi, J. Current situation and challenges for mental health focused on treatment and care in Japan and the Philippines - highlights of the training program by the National Center for Global Health and Medicine. In BMC Proceedings. BioMed Central. (2020); 14(11);
  • Estrada, C.A.M., Gregorio Jr, E.R., Kanyasan, K., Hun, J., Tomokawa, S., Dumlao, M.C., & Kobayashi, J. School Health Promotion in Southeast Asia by Japan and Partners. Pediatrics International. (2020); ;
  • Akiyama, T., Njenga, S.M., Njomo, D.W., Takeuchi, R., Kazama, H., Mutua, A., Walema, B., Tomokawa, S., Estrada, C.A.M., Henzan, H., & Asakura, T. Implementation of Kenyan comprehensive school health program: improvement and association with students’ academic attainment. Health Promotion International. (2020); ;
  • Takeuchi R, Njenga SM, Ichinose Y, Kaneko S, Estrada C.A.M., Kobayashi J. Is there a gap between health education content and practice toward schistosomiasis prevention among schoolchildren along the shores of Lake Victoria in Kenya?. PLoS neglected tropical diseases. (2019); e0007572.; 13(8)
  • Katsuno, C., Gregorio, E. R. G., Lomboy, M., Nonaka, D., Hernandez, P.M.R., Estrada, C. A.M., Pimentel, J., Bernadas, R., & Kobayashi, J. Quality of public school toilets and the frequency of changing sanitary napkins among students in public secondary schools in the City of Manila, Philippines. Tropical Medicine and Health. (2019); 47(1);
  • Hernandez PMR, Estrada CM, Nonaka D, Gregorio ER, Leynes CR, del Castillo RT, Hayakawa T and Kobayashi J. Suicidal ideation, suicidal behaviors, and attitudes towards suicide of adolescents enrolled in the Alternative Learning System in Manila, Philippines – a mixed methods study. Tropical Medicine and Health. (2019); 47(22); doi: 10.1186/s41182-019-0149-6
  • Estrada, C. A. M., Lomboy, M. F. T. C., Gregorio, E. R., Amalia, E., Leynes, C. R., Quizon, R. R., & Kobayashi, J. Religious education can contribute to adolescent mental health in school settings. International journal of mental health systems. (2019); 13(1); 1-6
  • Estrada, C. A. M., Marcelo, A. D., Corpuz, J. B., & Antonio, C. A. T.. Early Childhood Care, Education, and Development in the Philippines: Principles, Legal Aspects, and Public Health Implications. Philippine Journal of Health Research and Development. (2017); 21(1); 54-60
  • Villanueva, S. Y. A. M., Saito, M., Baterna, R. A., Estrada, C. A. M., Rivera, A. K. B., Dato, M. C., Zamora, P.R.F.C., Segawa, T., Cavinta, L.L., Fukui, T., & Masuzawa, T. Leptospira-rat-human relationship in Luzon, Philippines. Microbes and Infection. (2014); 16(11); 902-910