The topics in refresher courses can vary but generally include: - Advanced Epidemiological Methods: Including cohort studies, case-control studies, and randomized controlled trials. - Emerging Infectious Diseases: Understanding new pathogens and their epidemiology. - Chronic Disease Epidemiology: Focusing on non-communicable diseases like cancer, diabetes, and heart disease. - Statistical Software Training: Such as R, SPSS, and SAS. - Epidemiological Surveillance: Techniques for monitoring and controlling disease outbreaks.