Salmonella in sows: a longitudinal study in farrow-to-finish pig herdsNathalie Nollet, Kurt Houf, Jeroen Dewulf, Aart De Kruif, Lieven De Zutter and Dominiek MaesVet. Res., 36 4 (2005) 645-656DOI: https://doi.org/10.1051/vetres:2005022