EN
Bulk milk samples were tested for the presence of antibody to IBR/IPV virus using the ELISA (Bommeli, Ch). Of 4 large dairy herds 2 were infected. Six asymptomatic infected animals were found in each of the positive herds. IBR/IPV wirus antibodies were not found in individual milk samples from small fammily farms. These results confirm the monitor cattle herds, which will allow to be able to identify the epizootiologic situation in the country and eventually the undertaking of a control program.