Recent changes in veterinary medicine have required quantitative epidemiological techniques for designing field surveys, identifying risk factors for multifactorial diseases, and assessing diagnostic tests. Several relevant techniques are brought together in the package of veterinary epidemiological computer software, WIN EPISCOPE 2.0, described in this paper. It is based on Microsoft Windows and includes modules for the design and analysis of field surveys, control campaigns and observational studies, and a simple mathematical model. It provides comprehensive ‘Help’ screens and should therefore be useful not only in field investigations but also for teaching veterinary epidemiology.

We analysed the effect of probiotic strains on the cellular and humoral immune responses of rainbow trout (Oncorhynchus mykiss), and their capacity to