Denis Nixon Opio is a Ugandan Epidemiologist and Eiostatistician with more than ten years of experience in field epidemiology, public health surveillance, and academic teaching. He holds a Master of Science in Epidemiology and Biostatistics from Makerere University, a Bachelor of Science in Quantitative Economics (Mathematics, Statistics, Economics and Computer Programming) from Gulu University, and has completed the Advanced Field Epidemiology Training Programme (FETP) under the Uganda Public Health Fellowship Programme, Ministry of Health, in collaboration with Makerere University School of Public Health.

Through his training and professional practice, Denis has developed advanced expertise in lecturing and mentoring fellows in biostatistics and epidemiology, guiding study design, and conducting both quantitative and qualitative data analysis using modern statistical packages such as Python, R, STATA, SPSS, EPI Info, and Excel. He is also skilled in scientific writing, manuscript preparation, and delivering conference presentations.

His scholarly contributions include several publications in peer‑reviewed journals. Among them are: Evaluation of the Surveillance System in Kiryandongo Refugee Settlement, Uganda (Pan African Medical Journal, 2017); Spatial and Temporal Trends of Cesarean Deliveries in Uganda, 2012–2016 (BMC Pregnancy and Childbirth); Epidemiologic

Investigation of a Cluster of Deaths Due to Eating Fried Rice Balls Intentionally Tainted with Quinalphos, Sironko District, Uganda: A Case Series (Journal of Environmental and Public Health, 2017); Sporadic Rift Valley Fever Outbreaks in Humans and Animals in Uganda (2017–2018); Evaluation of Public Health Surveillance Systems in Refugee Settlements in Uganda, 2016–2019: Lessons Learned (BMC Conflict and Health); and Evaluation of the Disease Surveillance System in Adjumani District Refugee Settlements, Uganda (Global Journal of Medical Research, 2017).

Beyond publications, Denis has led and participated in numerous epidemiological investigations. He served as Principal Investigator in studies such as mercury exposure among artisanal gold miners in Amudat District (2017), a mumps outbreak in Watoto Children’s Home, Wakiso District (2017), and a cholera outbreak in Kyaka II Refugee Settlement, Kyegegwa District (2018). He also investigated trends and treatment outcomes of multi‑drug resistant tuberculosis in Uganda (2015–2017). As a co‑investigator, he contributed to inquiries into mysterious deaths in Nakilimbwa Village, Sironko District (2017), the Marburg outbreak in Kapchorwa and Kween Districts (2017), and suspected Rift Valley Fever in Buikwe District (2018).

Currently, Denis serves as an Assistant Lecturer of Epidemiology and Biostatistics at Lira University, where he continues to combine his academic expertise with practical field experience to train future public health professionals and contribute to Uganda’s health system strengthening.