Bactericidal efficacy of two disinfectants against Brachyspira hyodysenteriae and one feed supplement against B. hyodysenteriae and B. pilosicoli

Abstract

In vitro tests were used to evaluate bactericidal efficacy of two disinfectants on the basis of peroxygen compounds against one type strain and one field isolate of B. hyodysenteriae. Mean bactericidal concentrations (MBCs) of the two products ascertained with and without the load of organic matter of sterile pig faeces were several times lower than the recommended application concentrations. Bactericidal efficacy of an extract of citric seeds (feed supplement) against type strains of B. hyodysenteriae and B. pilosicoli, with six field isolates of B. hyodysenteriae and three field isolates of B. pilosicoli was also demonstrated, and its MBCs were determined. It was further determined that after 10 minutes exposure of 10% sterile pig faeces to field isolate and type strain of B. hyodysenteriae the efficacy of both disinfectants was 16 times higher than the concentration recommended by the manufacturer. The bactericide effect of citrus fruit extracts was exhibited at 0.05% concentrations after 5 min exposure, which is the same as recommended by the manufacturer.