Transmission of Streptococcus equi Subspecies zooepidemicus Infection from Horses to Humans
Sinikka Pelkonen1 , Susanne B. Lindahl1, Päivi Suomala, Jari Karhukorpi, Sakari Vuorinen, Irma Koivula, Tia Väisänen, Jaana Pentikäinen, Tiina Autio, and Tamara Tuuminen
Author affiliations: Finnish Food Safety Authority Evira, Kuopio, Finland (S. Pelkonen, T. Autio); National Veterinary Institute, Uppsala, Sweden (S.B. Lindahl),; Swedish University of Agricultural Sciences, Uppsala (S.B. Lindahl); Eastern Finland Laboratory Centre Joint Authority Enterprise, Mikkeli, Finland (P. Suomala, T. Tuuminen); Eastern Finland Laboratory Centre Joint Authority Enterprise, Joensuu, Finland (J. Karhukorpi); Eastern Finland Laboratory Centre Joint Authority Enterprise, Kuopio (J. Pentikäinen); Mikkeli Central Hospital, Mikkeli (S. Vuorinen); Kuopio University Hospital, Kuopio (I. Koivula, T. Väisänen); University of Helsinki, Helsinki, Finland (T. Tuuminen)
Figure 1. . . . . . . eBURST diagram (http://eburst.mlst.net) of all multilocus sequence typing (MLST) sequence types (STs) for Streptococcus equi subspecies zooepidemicus and S. equi subsp. equi recorded in the PubMLST database (http://pubmlst.org/szooepidemicus) (February 7, 2013). Single-locus variants (SLVs) are connected by a solid line. Black circles indicate strains isolated in this study from human cases and 1 horse (ST-10: Hum1, horse isolate 648/11, and Hum2; ST-209: Hum3 isolate). Gray circles indicate strains isolated from horses in this study. SzP protein sequence types were identical (GenBank accession no. AF519488) for the double-locus variants ST-201 and ST-209, whereas the SzP protein STs differed for strains not closely related by MLST (as described in Table 2).
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