CVMP anbefalede også, at anvendelsen af midlet bør baseres på kultur - og følsomhedstest af mikroorganismer fra sygdomstilfælde eller nyere erfaringer på bedriften, da resistens mod forstærkede sulfonamider kan variere.
The CVMP also recommended that the use of the product should be based on culture and sensitivity testing of micro-organisms from diseased cases on farm or from recent previous experience on the farm, as resistance against potentiated sulphonamides may vary.