EN
The article presents data of a computer analysis of the antibiotic resistance patterns and results of evaluations of the level of antibiotic resistance of Gram positive and Gram negative bacteria isolated from pigs in 1985-1990, performed in diagnostic laboratories of the Centers of Veterinary Hygiene in Białystok, Katowice, Olsztyn, Poznań, Warszawa and Wrocław. The resistance of Escherichia coli (non-haemolytic, haemolytic and β-haemolytic), Pasteurella multocida, Salmonella typhimurium, S. choleraesuis, S. enteritidis, Salmonella of the В group, Streptococcus β-haemolyticus against ampicillin, chloramphenicol, erythromycin, neomycin, nitrofurantoin, oxytetracycline, penicillin, streptomycin, sulphonamides, sulphonamides + TMP and TMP was analyzed. A high level of resistance of E. coli isolates (54-97%) to ampicillin, oxytetracycline, sulphonamides and sulphonamides potentiated with TMP and a low level of resistance (26-42%) to nitrofurantoin, neomycin, streptomycin and chloramphenicol were determined. P. multocida isolated were characterized by a high level of resistance to sulphonamides and sulphonamides potentiated with TMP (61-85%) and a low resistance to oxytetracycline (32%). Salmonella sp. was characterized by a very low resistance (51-74%). S. β-haemolyticus had (62%) and a lower resistance to streptomycin (46%), penicillin (24%) and nitrofurantion (23%).