A total of 101 β-hemolytic streptococci isolates including 91
Streptococcus dysgalactiae subsp.
equisimilis (
S. equisimilis) and 10
Streptococcus porcinus (
S. porcinus) were obtained from septicemia-type verrucous endocarditis samples of pigs slaughtered in Kagoshima Prefecture. These
S. equisimilis isolates were categorized into Lancefield group C (74 isolates) and untypable (17 isolates). Antimicrobial strains for amynoglycosides, tetracyclines, and macrorides were 72 (79.1%), 74 (81.3%), and 38 (41.8%), respectively. Nineteen aminoglycosides-resistant isolates harbored the
aph (3')-
III a gene. The
tet(O) and
tet(M) genes were detected from 46 and 17 tetracyclines-resistant isolates, respectively. The
ermB and
mefA genes were detected from 31 and 6 macrolides-resistant isolates, respectively. Our study demonstrated that
S. equisimilis harboring antimicrobial-resistant genes have emerged among pigs in Kagoshima Prefecture.
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