Antimicrobial susceptibility and genetic characterization of Trueperella pyogenes isolates from pigs reared under intensive and extensive farming practices

Publication date: Available online 9 April 2019Source: Veterinary MicrobiologyAuthor(s): Ángela Galán-Relaño, Lidia Gómez-Gascón, Inmaculada Luque, Belén Barrero-Domínguez, Almudena Casamayor, Fernando Cardoso-Toset, Ana I. Vela, José F. Fernández-Garayzábal, Carmen TarradasAbstractTrueperella pyogenes is an opportunistic pathogen associated with a variety of diseases and responsible for important economic losses for pig production. Minimal Inhibitory Concentration (MIC) and Pulsed Field Gel Electrophoresis (PFGE) typing analysis were used to determine the MIC distribution and to genetically characterize a total of 180 T. pyogenes isolates obtained from slaughtered pigs reared under intensive (TpIN, n = 89) and extensive (TpEX, n = 91) farming practices. Low MIC90 values for penicillin and amoxicillin (0.008 and 0.06 µg/ml, respectively), ceftiofur, gentamicin and enrofloxacin (1 µg/ml, respectively) were obtained, so they could be of choice for the empiric treatment of T. pyogenes infections. Except for the penicillin, amoxicillin and ceftiofur, a statistically significant difference was observed in the MIC distribution of all antimicrobials analysed between TpIN and TpEX isolates. Also, MIC90 values were higher in TpIN than in TpEX isolates for neomycin and streptomycin (32 µg/ml vs 8 µg/ml), sulfamethoxazole/trimethoprim (30.4/1.6 µg/ml vs 1.90/0.10 µg/ml) and tylosin (≥1024 µg/ml vs 1 µg/ml). A relatively lower genetic diversity w...
Source: Veterinary Microbiology - Category: Veterinary Research Source Type: research