Abstract
Phage-encoded virulence genes of group A streptococci were detected in 10 (55.6%) of 18 isolates of group C streptococci that had caused bovine mastitis. Bovine isolates carried other genetic determinants, such as composite transposon Tn1207.3/Φ10394.4 (100%) and antimicrobial drug resistance genes erm(B)/erm(A) (22.2%), linB (16.6%), and tet(M)/tet(O) (66.7%), located on mobile elements.
Highlights
Strains of Streptococcus dysgalactiae subsp. dysgalactiae are described as α-hemolytic or nonhemolytic (Lancefield group C) and associated only with animal infections, a disease with major economic consequences for the dairy industry (1)
We studied a collection of field isolates of bovine group C streptococci (GCS) S. dysgalactiae subsp. dysgalactiae
Using PCR, we determined that bovine GCS S. dysgalactiae subsp. dysgalactiae strains (55.6%) carried >1 Group A streptococci (GAS)-specific bacteriophage virulence-associated genes
Summary
Phage-encoded virulence genes of group A streptococci were detected in 10 (55.6%) of 18 isolates of group C streptococci that had caused bovine mastitis. Bovine isolates carried other genetic determinants, such as composite transposon Tn1207.3/Φ10394.4 (100%) and antimicrobial drug resistance genes erm(B)/erm(A) (22.2%), linB (16.6%), and tet(M)/tet(O) (66.7%), located on mobile elements. We studied a collection of field isolates of bovine GCS S. dysgalactiae subsp. SpeM was found in 10 (55.6%) of 18 bovine GCS isolates, speK in 9 (50%), speC and spd[1] in 6 (33%), and speL in 4 (22.2%). Human GAS Virulence Genes in Bovine GCS phenotype) and contained erm(B) or erm(A) genes (22.2%) or erythromycin susceptible and pirlimycin resistant and contained the linB gene (16.6%).
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