Genetic structure of populations of beta-haemolytic Lancefield group C streptococci from horses and their association with disease
Jorm, L.R.; Love, D.N.; Bailey, G.D.; McKay, G.M.; Briscoe, D.A.
Research in Veterinary Science 57(3): 292-299
1994
ISSN/ISBN: 0034-5288 PMID: 7871247 Document Number: 427665
The genetic structure of beta-haemolytic Lance-field group C streptococci isolated from horses in Australia was examined by multilocus enzyme electrophoresis. The 249 isolates comprised 70 classified phenotypically as Streptococcus equi subspecies equi, 177 classified as S. equi subspecies zooepidemicus and two which were unclassifiable. Forty-one electrophoretic types were identified which could be classified into three major clusters, A, B and C. Of the isolates, 178 fell into cluster B (type 4 to 22) and lay within a genetic distance of 0.36. Sixty-nine of the 70 S. equi subspecies equi isolates fell into type 12, which suggests that they were members of a single clone, and the isolates from abscesses were significantly more likely to belong to type 12 than those from horses with no clinical signs (P lt 0.001). There were no other significant associations between electrophoretic types or clusters and the isolation of the organisms from paricular sites. These data suggested that S. zooepidemicus may be the archetypal species from which the clone designated subspecies equi has been derived. If isolates of the subspecies equi from other geographical regions also prove to be members of electrophoreic type 12, this hypothesis would be strengthened.