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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