The philosophy behind a consolidated approach to livestock disease diagnostics in South America

ABSTRACT: This article outlines the philosophy underlying the livestock diagnostic system that has been developed and consolidated over the past six decades and is now used in most veterinary diagnostic laboratories in Uruguay, Brazil, and Argentina. The origins of this approach are complex, having been shaped by historical circumstances such as the post-war period, political transitions, military dictatorships, economic crises, and the contributions of numerous institutions and individuals. The emergence of outstanding veterinary pathologists between the 1950s and 1970s played a decisive role in this process. Several diagnostic laboratories recognized the importance of integrating fieldwork and laboratory practice, making this interaction both a lifestyle and a crucial tool for addressing the health challenges of livestock. As a result, a mixed case-entry system was established, combining active investigation through regular field visits with the passive reception of samples submitted by field veterinarians. In parallel, modern and robust diagnostic methods were progressively incorporated, providing a strong basis for impactful scientific publications and postgraduate research. Diagnostic pathology combines morphological findings from anatomopathological examinations with laboratory methods to improve diagnostic accuracy. This systematic approach fostered the development of a regional identity capable of enduring, and often overcoming, the limitations imposed by restricted investment in basic and applied veterinary sciences. Such resilience was sustained by a multidisciplinary and interinstitutional perspective. Several fundamental principles guided the establishment of veterinary diagnostic laboratories: (1) the training and availability of specialized human resources; (2) adequate infrastructure, vehicles, equipment, and modern diagnostic techniques; (3) long-term and stable funding; (4) research oriented toward solving the real problems faced by livestock producers; (5) the continuous collection and processing of epidemiological data; (6) the constant exchange of diagnostic techniques and information among laboratories; and (7) the active participation of researchers as mentors in graduate programs, alongside the direct involvement of graduate students in diagnostic activities. Over the past decades, this approach has significantly transformed animal health in the region, even during periods when principles such as infrastructure and long-term funding were only partially fulfilled. Adapted to South American conditions, the model has enabled a holistic perspective on human, animal, and environmental health, strengthening the integration of research, teaching, extension, scientific development, and trust in veterinary services in both domestic and international markets. The emerging paradigm is that future generations of pathologists will carry this knowledge forward, because the cows are still in the field!