Incidence and drug sensitivity of bacteria isolated from diseased lungs inpigs

One hundred eighty four strains of Streptococcus suis; 191 strains of Actin obacillus pleuropneumoniae; 23 strains of Salmonella choleraesuis; 1027 str ains of Pasteurella multocida and 580 strains of Escherichia coli were isol ated from pneumonic Lesions of 1052 porcine lungs, collected from 370 pig h oldings during the period, from 01.1998-08.2000 in Poland, were tested for antibiotic susceptibility-to cefquinom, enrofloxacine, tetramutin, gentamic in, neomycin, Lincospectin, amoxycillin, tetracycline, tiamulin, penicillin , oxytetracycline, tylosin and streptomycin. The results of the study indicated that more than 97.9% of Actinobacillus p leuropneumoniae isolates were sensitive or moderately sensitive to cefquino m, More than 30% of these isolates mere resistant to streptomycin and tylos ine. Over 90% of P. multocida isolates were sensitive to cefquinom, enroflo xacine, tetramutin, Lincospectin, gentamycin, amoxycillin, neomycin, penici llin, tetracycline and tiamuline; 14%; of P.m. were 31.5% resistant to oxyt etracycline, 25.5% to tylosine and 31.5% to streptomycine. The analysis demonstrated a relatively high level of resistance among Strep . suis isolates. Above: 30% of these bacteria were resistant to tiamulin, t etracycline, Lincospectin, oxytetracycline and streptomycin. A relatively h igh percentage of Strep. suis strains were sensitive to: cefquinom (96.7%), gentamycin:. (96.1%), enrofloxacine (95.6%), tetramutin, (95.6%) neomycin (95.1%) and amoxycylline (93.4%). The increasing level of resistance to rou tinely used chemiotherapeutics was observed among isolates of Salmonella sp . More than 50% of these strains were resistant to tylosine, axytetracyclin e, tetracycline and streptomycin; over 30% of Salmonellae were resistant to tiamulin, tetramutin and cefquinom. The highest sensitivity of these patho gens was observed in relation to enrofloxacine (95.6%). A high level of res istance was observed among E. coli isolates. Above 70% of isolates were res istant to tetracycline, tylosine, streptomycin and oxytetracycline. A relat ively high percentage of E. coli isolates were sensitive to cefquinom (97.9 %) and enrofloxacine (95%). In comparison with previous studies performed i n 1996-1998, an increased resistance to different chemiotherapeutics was ob served among Salmonella sp., Streptococcus sp. and E. coli strains.