e Streptococcus suis is an emerging swine-associated zoonotic agent that can cause meningitis and septicemia in humans. We present, to our knowledge, the first case of S. suis arthroplasty infection and streptococcal toxic shock-like syndrome due to an nonencapsulated serotype 5 strain in North America.
CASE REPORTA 74-year-old man with a history of non-Hodgkin's lymphoma, in remission, and splenectomy was transferred to our institution for management of septic shock. The patient was a pig farmer who had undergone right total hip arthroplasty (THA) in 1993 and left THA in 1996, both for osteoarthritis. In January 2010, he had undergone a revision left hip arthroplasty for polyethylene wear.He was well until February 2011, when he developed acute severe left hip pain while working on his farm. Other symptoms included a few days of nausea, vomiting, and diarrhea. A syncopal episode prompted evaluation at a local hospital, where he was found to be febrile (39.4°C), tachypneic (24 breaths/min), and hypotensive (89/45 mm Hg). He received 6 liters of fluids and norepinephrine and was transferred to our institution, where he was hypotensive, with metabolic acidosis (lactate concentration of 6.7 mmol/liter), acute renal failure, leukopenia (white blood cell [WBC] count of 1.4 ϫ10 9 /liter), and disseminated intravascular coagulopathy. He had a diffuse erythematous rash on his chest, back, and neck, and severe pain was elicited with movement of the left hip.Due to severe respiratory and metabolic acidosis, he was placed on mechanical ventilation. Intravenous vancomycin and meropenem were empirically started. A radiograph of the hip showed a left trochanteric fracture with cerclage and lucency of the acetabular component (Fig. 1). An ultrasoundguided arthrocentesis of the left hip was attempted, but no fluid was obtained. Five milliliters of sterile normal saline was injected, and 0.5 ml was withdrawn for culture only. Blood and aspirated saline submitted to the Clinical Microbiology Laboratory, Mayo Clinic, Rochester, MN, grew alpha-hemolytic Gram-positive cocci in pairs that formed mucoid colonies (Fig. 2) that were catalase negative, optochin resistant, and bile insoluble. The isolate was identified as Streptococcus suis by partial 16S rRNA gene sequencing. It was susceptible to penicillin (MIC, Յ0.06 g/ml), ceftriaxone (MIC, Յ0.5 g/ml), and vancomycin (MIC, Յ1.0 g/ml) and resistant to erythromycin (MIC, Ͼ0.5 g/ml) (as there are currently no breakpoints for S. suis by the Clinical and Laboratory Standards Institute guidelines, breakpoints for viridans group streptococci were used). On hospital day 3, irrigation and debridement with polyethylene liner exchange were performed on the left hip. Intraoperative frozen sections showed chronic inflammation; periprosthetic tissue cultures were negative. Cerebrospinal fluid showed 26 mg/dl of protein, 73 mg/dl of glucose (serum glucose, 109 mg/dl), 1 leukocyte/l (76% lymphocytes), and negative bacterial culture. A transesophageal echocardiogram was negative for heart valve vege...