The first third will be directed to give basic notions on veterinary epidemiology mainly regarding way of transmition, and measurement of frequencies (prevalence, incidence, morbility, mortality and lethality). The second third will concern about a few examples of animal disease particularly difficult to diagnose, treat and prevent. The last period will consist of a practical approach. Student will be organized in 4-5 u per group. Each group will chose an infectious disease from the OIE list in order to design a biotech product. The groups will work on-line and will learn how to retrieve informations by official sites ,reference laboratories and data-banks like NCBI and EMBO. In such period the students will learn the use of bio-informatic tools like Bioedit, Clustall W, etc. Finally the groups will present their results and products to each other.