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ASM Case Rep

Septic arthritis caused by Streptococcus equi subspecies zooepidemicus: a case report.
ASM case reports    February 27, 2026   Volume 2, Issue 3 e00211-25 doi: 10.1128/asmcr.00211-25
Wang T, San Juan MR, Choi H, Hwang M, Jinadatha C, Navarathna DH. subspecies (SESZ) is an uncommon zoonotic pathogen in humans but can cause severe joint infections. Reported cases are often linked to exposure to horses, dairy products, or raw pork, though infections may occur without an identifiable animal source. Unassigned: An 84-year-old man with multiple comorbidities presented with acute left shoulder pain, fever, and chills. Synovial fluid aspiration yielded turbid fluid containing calcium pyrophosphate dihydrate crystals, while Gram stain was negative. Despite empiric broad-spectrum antibiotics, his symptoms persisted, requiring surgical irrigation...
Tricuspid valve endocarditis in a horse owner, caused by Streptococcus equi subsp. zooepidemicus.
ASM case reports    July 31, 2025   Volume 1, Issue 5 e00059-25 doi: 10.1128/asmcr.00059-25
Roy CN, Wiechmann CE, Dev A, Walther BK, Musser JM, Olsen RJ, Beres SB, Axell-House DB. subsp. (SESZ) are zoonotic group C streptococci primarily acquired from contact with horses and other animals, such as llamas. They are unusual causes of infection in humans and rarely cause infective endocarditis. Unassigned: A 58-year-old woman presented with fever, malaise, and polyarthritis. Clinical evaluation diagnosed native tricuspid valve SESZ endocarditis. The SESZ isolate was genetically closely related to a clone causing an outbreak of post-streptococcal glomerulonephritis linked to the consumption of unpasteurized cheese in Brazil. The patient had no exposure to unpasteurized ch...