| 要約: | Knowledge of pathogenic potential, frequency and antimicrobial resistance patterns of porcine <i>Streptococcus</i> (<i>S</i>.) spp. other than <i>S. suis</i> is scarce. Between 2016 and 2020, altogether 553 <i>S</i>. spp. isolates were recovered from clinical specimens taken from Austrian swine stocks and submitted for routine microbiological examination. Antimicrobial susceptibility testing towards eight antimicrobial substances was performed using disk diffusion test. All isolates from skin lesions belonged to the species <i>S. dysgalactiae</i> subspecies <i>equisimilis</i> (SDSE). <i>S. hyovaginalis</i> was mainly isolated from the upper respiratory tract (15/19) and <i>S. thoraltensis</i> from the genitourinary tract (11/15). The majority of <i>S. suis</i> isolates were resistant to tetracycline (66%), clindamycin (62%) and erythromycin (58%). <i>S. suis</i> isolates from the joints had the highest resistance rates. <i>S. suis</i> and SDSE isolates resistant to tetracycline were more likely to be resistant to erythromycin and clindamycin (<i>p</i> < 0.01). Results show that different species of <i>Streptococcus</i> tend to occur in specific body sites. Nevertheless, a statement whether these species are colonizers or potential pathogens cannot be given so far. High resistance rates of <i>S. suis</i> towards tetracyclines and erythromycin and high recovery rates of <i>S. suis</i> from lung tissue should be considered when treating pigs with respiratory diseases.
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