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Inicio Enfermedades Infecciosas y Microbiología Clínica (English Edition) Corynebacterium striatum prosthetic joint infection
Journal Information
Vol. 37. Issue 7.
Pages 480-481 (August - September 2019)
Vol. 37. Issue 7.
Pages 480-481 (August - September 2019)
Scientific letter
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Corynebacterium striatum prosthetic joint infection
Infección de prótesis de rodilla por Corynebacterium striatum
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Marta Fernández-Esguevaa,
Corresponding author
martafdzesg@hotmail.com

Corresponding author.
, Nuria Pérez-Jimenob, Víctor Roda-Rojob, Isabel Ferrer-Ceróna
a Servicio de Microbiología Clínica y Parasitología, Hospital Universitario Miguel Servet, Zaragoza, Spain
b Servicio de Cirugía Ortopédica y Traumatología, Hospital Universitario Miguel Servet, Zaragoza, Spain
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Corynebacterium spp. is a Gram-positive bacilli classically considered to be an opportunistic pathogen which colonises the skin and mucous membranes. It has recently been found to be involved in respiratory infections and endocarditis, and it is an emerging causal agent of prosthetic joint infections.1,2 We describe a case of knee replacement infection.

This was an 85-year-old woman with no known drug allergies. She had a previous medical history of hypertension, chronic atrial fibrillation, asthma and breast cancer treated in 1998. Her surgical history consisted of bilateral total knee replacements. She had knee replacement surgery for primary knee osteoarthritis in the right knee in 2000 (Zimmer® NexGen) and in 2009 had further surgery for a new replacement knee (Zimmer® LCCK) due to aseptic loosening. In September 2016, the patient went to Accident and Emergency (A&E) with suspected infection of her artificial knee. On examination in A&E: knee swollen, diffusely painful since July 2015, with flexion limited to 90°. She had inflammatory signs of CRP 10.93 and leucocytes 6300, with 74.1% neutrophils. X-ray showed loosening of the prosthesis. As the alpha-defensin test (Synovasure®) was positive, joint fluid samples were taken for culture. Gram-staining showed abundant polymorphonuclear cells and in cultures from the arthrocentesis, Corynebacterium striatum was isolated from the enrichment culture at five days. However, this was reported as the usual flora of the skin because it was only one sample.

In October, the patient had another alpha-defensin test, which was also positive, and new samples were taken for culture in the operating theatre.

C. striatum was isolated in all the intra-operative samples, as well as in the prosthesis and the joint fluid. Some of the samples were isolated only from the enrichment culture, but in others it was isolated from the original plate. All grew in blood and chocolate agar. The patient was started on treatment with IV vancomycin 1g/12h and IV ceftazidime 2g/8h for five days. With the results of the antibiogram, the treatment was changed to IV linezolid 600mg/12h for nine days.

In December, the patient had a second knee replacement operation (Zimmer LCCK). New samples were taken for culture which came back negative. The patient had been prescribed vancomycin 1g/8h for nine days pending the culture results.

The patient is currently making good progress, with infection markers (CRP) falling and no signs of infection.

Identification was performed by mass spectrometry and antibiotic sensitivity by E-test (bioMérieux®) in Mueller-Hinton blood incubated at 35°C. The isolate presented the following MIC: resistant to penicillin (0.5μg/ml), ciprofloxacin (>32μg/ml), levofloxacin (>32μg/ml), gentamicin (>256μg/ml), tetracycline (16μg/ml), clindamycin (>250μg/ml), rifampicin (128μg/ml), ceftriaxone (4μg/ml), trimethoprim-sulfamethoxazole (6μg/ml); and sensitive to vancomycin (0.25μg/ml) and linezolid (0.5μg/ml). C. striatum was classified as sensitive or resistant based on the criteria defined by the CLSI (Clinical & Laboratory Standards Institute).3

C. striatum is a microorganism which forms part of the normal flora of the skin and mucous membranes. In recent years it has been described as an emerging pathogen, especially in immunocompromised patients, patients undergoing surgery or patients with some type of prosthesis.4,5 Infections such as endocarditis, meningitis, osteomyelitis, respiratory infections, ulcer infections, peritonitis, pancreatic abscesses, pneumonia, urinary tract infections and septic arthritis have recently been reported.4,6–8

Antibiotic sensitivity is very variable. An antibiogram has to be performed, as C. striatum generally has high resistance to antibiotics, and nosocomial outbreaks have been reported in some cases.1,9 It tends to remain sensitive to vancomycin and linezolid.10

C. striatum is difficult to identify. There are several diagnostic methods available based on biochemical tests and gene sequencing. However, the species of just 65–85% of clinical isolates of Corynebacterium spp. can be identified using the API Coryne system. We used the MALDI-TOF mass spectrometry (MS) system, which is fast and cheap and effectively identifies the species.9

This case adds to the growing importance of C. striatum as a pathogen, although some laboratories continue to have difficulty with correct identification. With the introduction of new technologies such as MALDI-TOF MS, it will become easier to diagnose infections with this microorganism.

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Please cite this article as: Fernández-Esgueva M, Pérez-Jimeno N, Roda-Rojo V, Ferrer-Cerón I. Infección de prótesis de rodilla por Corynebacterium striatum. Enferm Infecc Microbiol Clin. 2019;37:480–481.

Copyright © 2018. Elsevier España, S.L.U. and Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica
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