The importance of reporting notifiable infectious diseases - the Swiss reporting system.

The structured processes of clinical medicine and epidemiology are closely aligned, with disease reporting serving as the critical interface between individual patient care and population-level public health action. In Switzerland, mandatory reporting of communicable diseases forms the backbone of national infectious disease surveillance and relies on coordinated contributions from clinicians and laboratories. The Swiss reporting system is regulated by an ordinance that defines notifiable diseases, reporting criteria and strict timelines. It encompasses severe diseases, outbreak-prone infections, and endemic or vaccine-preventable conditions, and is continuously updated to reflect evolving epidemiological threats. Accurate case classification depends on the integration of both clinical and laboratory data; incomplete reporting compromises data quality and can lead to misclassification and biased epidemiological conclusions. In recent years, reporting compliance - particularly for clinical notifications - has declined significantly. This deterioration in data completeness limits the ability to detect outbreaks, assess trends and implement timely and targeted public health interventions. Contributing factors include administrative burden, limited awareness of reporting obligations and insufficient understanding of the public health value of reporting. High-quality reporting is essential for multiple public health functions: enabling rapid containment measures such as contact tracing and isolation, supporting outbreak detection through statistical surveillance and genomic analysis, informing national health policies and vaccination strategies, and facilitating research. Surveillance data are routinely analysed and disseminated via national dashboards and international collaborations. In conclusion, although reporting imposes additional demands on clinicians, it remains a fundamental component of effective public health practice. Strengthening reporting compliance and data quality is critical to ensuring timely interventions, reducing disease burden and maintaining resilient health systems. Improved digital solutions may alleviate reporting burdens; however, sustained clinician engagement and recognition of their role in public health are indispensable.