In some studies conducted in Europe, diarrhoea is estimated to account for 5-24% of overall pre-weaning mortality and to reduce average daily gain (ADG) by 8-14 g per day. Based on these effects, the cost of neonatal diarrhoea was recently estimated to be 134 € per sow per year. The aim of this study was to assess the financial impact of SUISENG® vaccination under field conditions on a commercial farm located in Portugal.