In a cross-sectional study including a total of 2633 Danish swine herds, Salmonella enterica was isolated from at least one of 10 samples in 43 (12%) breeding- and multiplying herds, in 51 (17%) farrow-to-grower herds and in 223 (II%) slaughterpig herds. Isolates were characterised by serotyping and isolates of S. Typhimurium were phage typed. Isolates from 305 herds were tested for susceptibility to 12 antimicrobial agents. The most frequently isolated serotype was S. Typhimurium, and the most frequently isolated phage type was DTI2. Multiresistant S. Typhimurium DTI 04 was isolated from one slaughterpig herd. The majority of isolates were susceptible to the antimicrobial agents tested, but resistance was identified in 58 (17%) of the infected herds, and multiresistance (resistance to 4 or more types of antibiotics) was identified in S. Typhimurium of different phage types as well as in other serotypes. Compared to a previous study of 1363 Danish slaughterpig herds performed in 1993-94 no major changes in type distribution had occurred.
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