Abstract
The goal of this retrospective study was to have a comprehensive picture of the β-hemolytic streptococci of horses including tissue/organ distributions and susceptibility patterns against specific antimicrobials between January 1, 2000 and December 31, 2010. A total of 2,497 β-hemolytic streptococci were isolated from 2,391 cases, of which Streptococcus equi subsp. zooepidemicus was the most frequent isolate (72.0%). Other species isolated were Streptococcus dysgalactia subsp. equisimilis (21.3%), Streptococcus equi subsp. equi (5.8%), and unidentified β-hemolytic streptococci (0.9%). As expected, S. equi was mostly isolated from lymph node abscesses and the respiratory tract in foals and adult horses. Streptococcus equi subsp. zooepidemicus and S. equisimilis were mostly isolated from placenta, fetal tissues, and genital tract of horses; S. zooepidemicus and S. equisimilis were also recovered in significant numbers from a number of other organs including lung, liver, brain, kidney, and joints, indicating a much broader tissue tropism than S. equi. In addition, more than 1 Streptococcus spp. was recovered in 106 cases, indicating the co-existence of these bacteria in some horses. This data also suggested that S. equisimilis is ...Continue Reading
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