title: Isolation and characterization of β-haemolytic-Streptococci from endometritis in mares.
abstract: The objective of this manuscript was to validate published PCR-based methods for detection of β-haemolytic Streptococci by comparison with established bacteriological techniques using 85 clinical isolates recovered from uterine swabs of mares with clinical signs of endometritis and to determine the distribution of SeeL/SeeM and SzeL/SzeM superantigens in isolates of Streptococcus equi subsp. equi (S. equi) and S. equi subsp. zooepidemicus (S. zooepidemicus). The conventional bacteriological techniques showed the vast majority of these isolates (78) were S. zooepidemicus with just 5 Streptococcus dysgalactiae subsp. equisimilis (S. equisimilis) and 2 S. equi strains detected. The PCR analyses confirmed the bacteriological results demonstrating the reliability of the 16S rRNA PCR assay for detecting Streptococci, the multiplex PCR for differentiating between S. zooepidemicus, and S. equi, and PCR assays based on streptokinase genes for identification of S. equisimilis. PCRs for genes encoding superantigens revealed seeL and seeM specific amplicons with size of approximately 800 and 810 bp respectively for the S. equi strains and for 2 S. zooepidemicus strains. To our knowledge, this is the first report of szeL and szeM possession by S. zooepidemicus isolates derived from endometritis in mares.
authors.affiliation: Department of Biopathological Science and Hygiene of Food and Animal Production, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy. patrizia.casagrandeproietti@unipg.it
authors.forename: P
authors.initials: P
authors.lastname: Casagrande Proietti
authors.forename: A
authors.initials: A
authors.lastname: Bietta
authors.forename: G
authors.initials: G
authors.lastname: Coppola
authors.forename: M
authors.initials: M
authors.lastname: Felicetti
authors.forename: R F
authors.initials: RF
authors.lastname: Cook
authors.forename: M
authors.initials: M
authors.lastname: Coletti
authors.forename: M L
authors.initials: ML
authors.lastname: Marenzoni
authors.forename: F
authors.initials: F
authors.lastname: Passamonti
mesh_terms: D000818:Animals; D004269:DNA, Bacterial / Q000235:genetics; D004716:Endometritis / Q000382:microbiology*; D005260:Female; D006736:Horses / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary*; D015203:Reproducibility of Results; D013290:Streptococcal Infections / Q000662:veterinary*; D013291:Streptococcus / Q000235:genetics / Q000302:isolation & purification; D018089:Superantigens / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; D018089:Superantigens