Periprosthetic joint infection caused by Haemophilus parainfluenzae. Case report and literature review.

Rev Esp Quimioter 2023;36(3): 325-328 325 of progressive pain, and a possible loosening of the prosthesis was observed on radiographs. C-reactive protein (CRP) was 3 mg/dL and erythrocyte sedimentation rate (ESR) of 42 mm/h in addition to abundant joint effusion. An arthrocentesis for culture and study of the joint fluid was performed. Cell count was 6,280 cells/mm3 (85% polymorphonuclears), with glucose 177.0 mg/dl and CRP 6.84 mg/dl. This sample was inoculated in the following culture media: Tryptic soy sheep blood agar (TSS), chocolate agar (CHA), Shaedler-5% sheep blood agar (SCS), MacConkey agar (McC), and part of the fluid was also inoculated in a blood culture bottle (BactAlert), all from Biomérieux Marcy l’Etoile, France). TSS, CHA and McC were incubated at 37oC in a 5% CO2 atmosphere. SCS was incubated in an anaerobic atmosphere at 37oC. All media were incubated for 15 days.