Lietuvos mokslų akademijos Leidybos skyrius

Pathological material from pigs was investigated in the Veterinary Institute of Lithuanian Veterinary Academy and National Veterinary Laboratory during a 5-year period. Pathological material was investigated under suspicion of infections caused by pathogenic bacteria with the aim to isolate them and to determine their resistance to antimicrobials. In Lithuanian pig farms, among pathogenic and opportunistic bacteria most frequently E. coli and Salmonella spp. 176 strains of E. coli and 122 strains of Salmonella were isolated. The most common serotypes of E.coli were 08:K87, 0141:K85, and 0149:K91. Most of them contained fimbrial antigens F4, F5 or F6. S. Choleraesuis (79%) was the most common serovar among Salmonella. The highly pathogenic S. Enteritidis and S. Typhimurium were infrequent (respectively 3.3% and 2.5%).The HAP group (Haemophilus, Actinobacillus and Pasteurella) bacteria were also rather widespread: 84 strains of this group were isolated. The most frequent pathogens were Actinobacillus pleuropneumoniae, Haemophilus parasuis and Pasteurella multocida.The bacteria isolated from pigs were comparatively resistant to antimicrobials. E. coli and Salmonella spp. were most susceptible to polymyxin B and fluoroquinolones. The resistance to other antimicrobials was higher, especially to lincomycin-spectinomycin and aminoglycosides. 25% of staphylococci were resistant to penicillin, and 50% of streptococci were resistant to gentamicin. Bacteria of the HAP group were susceptible to many antimicrobials. All investigated Pasteurella multocida were tetracycline-sensitive, whereas Haemophilus and Actinobacillus spp. were susceptible to chloramphenicol, ceftiofur and polymyxin B.

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