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Knowledge of pathogenic potential, frequency and antimicrobial resistance patterns of porcine  Streptococcus  ( S .) spp. other than  S. suis  is scarce. Between 2016 and 2020, altogether 553  S . 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  S. dysgalactiae  subspecies  equisimilis  (SDSE).  S. hyovaginalis  was mainly isolated from the upper respiratory tract (15/19) and  S. thoraltensis  from the genitourinary tract (11/15). The majority of  S. suis  isolates were resistant to tetracycline (66%), clindamycin (62%) and erythromycin (58%).  S. suis  isolates from the joints had the highest resistance rates.  S. suis  and SDSE isolates resistant to tetracycline were more likely to be resistant to erythromycin and clindamycin ( p  < 0.01). Results show that different species of  Streptococcus  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  S. suis  towards tetracyclines and erythromycin and high recovery rates of  S. suis  from lung tissue should be considered when treating pigs with respiratory diseases.

Detection of Various Streptococcus spp. and Their Antimicrobial Resistance Patterns in Clinical Specimens from Austrian Swine Stocks