Appearance of multiresistant Salmonella typhimurium DT104 in swine in Poland
Salmonella (S.) Typhimurium phage type distribution remains unrecognised in Poland. We describe DT104 that appeared in swine no later than in 1998. The study revealed the presence of two integrons of 1.0 kb and 1.2 kb referring to, aminoglycoside and b-lactamase resistance genes cassette respectively in all DT104 and in one NT strain showing ACSSuT profile. These isolates tend to demonstrate additional resistance profiles. The findings illustrate the world-wide spread of multiresistant clone and point out the import of subclinically infected animals as a source of DT104 introduction into Polish swine herds.