Systemic <i>Streptococcus dysgalactiae</i> Subspecies <i>equisimilis</i> Infection in a Yorkshire Pig with Severe Disseminated Suppurative Meningoencephalomyelitis

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  • KASUYA Kazufumi
    Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, 11–1 Haramachi, Isogo, Yokohama, Kanagawa 235–0008, Japan
  • YOSHIDA Eiji
    Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, 11–1 Haramachi, Isogo, Yokohama, Kanagawa 235–0008, Japan
  • HARADA Rieko
    Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, 11–1 Haramachi, Isogo, Yokohama, Kanagawa 235–0008, Japan
  • HASEGAWA Mio
    Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, 11–1 Haramachi, Isogo, Yokohama, Kanagawa 235–0008, Japan
  • OSAKA Hiroyuki
    Pathological and Physiochemical Examination Division, Laboratory Department, Animal Quarantine Service, 11–1 Haramachi, Isogo, Yokohama, Kanagawa 235–0008, Japan
  • KATO Masaharu
    Animal Inspection Division, Quarantine Department, Animal Quarantine Service, 11–1 Haramachi, Isogo, Yokohama, Kanagawa 235–0008, Japan
  • SHIBAHARA Tomoyuki
    Pathology and Pathophysiology Research Division, National Institute of Animal Health, 3–1–5 Kannondai, Tsukuba, Ibaraki 305–0856, Japan

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  • Pathology : Systemic Streptococcus dysgalactiae Subspecies equisimilis Infection in a Yorkshire Pig with Severe Disseminated Suppurative Meningoencephalomyelitis

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An 18-week-old female breeding Yorkshire pig displayed symptoms of astasia and subsequently died. Histologically, severe disseminated suppurative meningoencephalomyelitis was detected, as were numerous myocardial microabscesses. Gram-positive cocci were detected in these suppurative lesions, and these cocci reacted with an antibody against Streptococcus C group species. Gram-positive cocci were isolated from the liver, spleen, kidney, heart, lungs, pleural abscess and articular fluid of the right tarsal joint. The isolates were β-hemolytic, categorized into Lancefield group C and were identified as Streptococcus dysgalactiae subspecies equisimilis by analysis of the 16S ribosomal DNA sequence. This is the first report of systemic S. equisimilis infection in a pig with severe disseminated suppurative meningoencephalomyelitis.

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