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. 2023 May;29(5):1020–1024. doi: 10.3201/eid2905.221338

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Emerging Infectious Diseases is a publication of the U.S. Government. This publication is in the public domain and is therefore without copyright. All text from this work may be reprinted freely. Use of these materials should be properly cited.

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Phylogenetic analysis of Streptococcus equi subspecies zooepidemicus strains in study of severe outbreak from unpasteurized dairy product consumption, Italy. We performed whole-genome sequencing and single-nucleotide polymorphism analysis of 40 S. equi subsp. zooepidemicus strains isolated from clinical and dairy food samples (Table 2). Tree was generated by using the neighbor-joining method. Different colors indicate the different types of samples. Strains were isolated from 2 samples each taken from bulk tank raw milk and cured raw milk cheese. Tree shows clinical specimen sequences clustered with those from dairy products. Scale bar indicates nucleotide substitutions per site.