- Case report
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Prosthetic valve endocarditis caused by Pseudomonas luteola
BMC Infectious Diseasesvolume 5, Article number: 82 (2005)
Pseudomonas luteola has been recognized as an uncommon cause of bacteremia and of infections in patients with underlying medical disorders
We isolated P. luteola from blood cutures in a patient with prosthetic valve endocarditis developed 16 months after cardiac surgery.
P. luteola is a rare opportunistic agent, with a propensity of infecting valvular prostheses.
Pseudomonas luteola (P. luteola) is an aerobic, Gram-negative rod with a distinctive yellow to orange pigment. After 48 hours of incubation, colonies are typically rough or wrinkled. The organism is non-fermentative, oxidase-negative, catalase-positive, and grows on MacConkey agar . The organism was originally named P. luteola. On the basis of low levels of DNA- DNA hybridization, it was subsequently reclassified as Chryseomonas luteola . Anzai et al. , in an analysis of 16S rDNA sequences of these organisms, has suggested that genus names Chryseomonas, Flavimonas and Pseudomonas were synonymous. Consequently, they concluded that the names P. luteola and Pseudomonas oryzihabitans should be used. The normal habitat of P. luteola is unclear, although it belongs to a group of bacteria normally found in water, soil, and other damp environments [3, 4]. Reported human infections are rare.
In July 2003, a 53-year-old man was admitted to the Timone hospital in Marseilles, France, presenting with clinical signs of acute endocarditis. He had a fever of 39°C that lasted for two weeks, anorexia, a weight loss of 7 kg since December 2002, a stroke with intracranial haemorrhage, and femoral arterial emboli. He had had an aortic replacement by a bioprosthesis in March 2002 for aortic insufficiency. In February 2003, the patient was hospitalized for undulating fever (38.5°C) that had lasted for the previous 3 months. The transeosophageal echocardiography showed neither valvular dysfunction nor vegetation. Six blood cultures were negative. The patient was treated with amoxicillin (1 g twice a day orally) for 8 days. The fever decreased but persisted at a level of 37.8°C. In July 2003, upon his admission, the echocardiography (multiplane transesophageal echocardiography) showed a vegetation on the aortic bioprothesis valve measuring 30 mm at its maximum, and a grade IV valvular regurgitation. The white blood cell count was of 14.36 × 109/L (92.7% polymorphonuclears, 5.0% lymphocytes, 2.3% monocytes), the haemoglobin level was of 90 g/L, the erythrocyte sedimentation rate (ESR) was of 50 mm/h (first hour), the C reactive protein level was of 208 mg/l. No rheumatoid factor was detected. All three aerobic blood cultures, as well as the removed femoral arterial thrombus yielded Pseudomonas luteola (P. luteola) within 48 h of culture. The microorganism was identified using both the API 20 E (Biomerieux,Marcy l'Etoile, France) and API 20 NE galeries (Biomerieux). The identification was confirmed by sequencing its 16S rDNA using the fD1 (AGAGTTTGATCCTGGCTCAG) and rP2 (ACGGCTACCTTGTTACGACTT) primers as previously described [2, 5–7]. The nucleotide sequence (GenBank accession number AY574976) was compared with sequences available in GenBank using the BLAST version 2.2.9 software (National Center for Biotechnology Information) and showed 99.7% similarity with the 16S rDNA sequence of P. luteola (GenBank accession number D84002). The patient's isolate was susceptible to ampicillin, ureidopenicillin, third-generation cephalosporins, fluoroquinolones, and aminoglycosides. The patient was treated intravenously with ticarcillin + clavulanic acid (3 g five times per day) for 60 days, and gentamicin (210 mg once a day) for 15 days. The high dose of ticarcillin + clavulanic acid was justified by the cerebral involvement. In the course of antibiotic therapy, the fever resumed and the patient's condition improved. However, worsening aortic insufficiency led to the replacement of the aortic bioprothetic valve 76 days following admission. Macroscopic examination of the removed valve showed extensive aortic vegetation. Microscopic examination showed features typical of infectious endocarditis . The bacterial culture of the valve was negative. The 16S rDNA PCR performed on valvular tissue was negative. Following cardiac surgery under extracorporeal circulation, the patient developed haemodynamic instability and renal insufficiency that required a prolonged hospitalization. The patient was released from hospital in February 2004, 7 months following admission.
Reported human P. luteola infections are rare. These have included a septicemia in a patient with systemic lupus erythematosus under corticosteroid therapy who developed haemorrhagic pancreatitis complicated by a pancreatic abscess ; one case of bacteremia in a previously healthy patient with granulomatous hepatitis ; a bacteremia in a patient with peritonitis ; and non-bacteremic cases of peritonitis associated with gangrenous appendititis  and continuous ambulatory peritoneal dialysis . Bacteremia has also been reported in patients with indwelling vascular catheters [10–12]. Other clinical isolates have been recovered from the bone of a patient with a femur abscess ; from a patient with a subphrenic abscess ; from the cerebrospinal fluid and wounds of neurosurgical patients with dural grafts or bone flaps ; from an HIV-infected patient with invasive cutaneous infection ; and from a patient with facial cellulitis . To the best of our knowledge, only two cases of endocarditis caused by P. luteola have been reported in patients with prosthetic cardiac valves [13, 14]. These patients had developed fever and blood cultures grew P. luteola 15 days  and 45 days , respectively, after cardiac surgery. In addition, one case of P. luteola septicemia has been described in a 5-month-old infant after open heart surgery for congenital cardiac disease . Septicemia was diagnosed 8 days after surgery but no endocarditis was found. In the present case, as the patient did not undergo any invasive procedure between the 2002 valvular replacement and the onset of fever, we believe that he was infected during the initial cardiac surgery.
Using the Duke endocarditis service criteria, our patient was classified as having a definite endocarditis (valvular histological examination confirmed the diagnosis of infectious endocarditis). The isolation of P. luteola in 3 blood cultures and in the arterial thrombus demonstrated its role as an etiologic agent. Including our patient, endocarditis with P. luteola has occurred in three patients who had undergone valvular replacement. This suggests that this organism is a rare opportunistic agent, with a propensity of infecting valvular prostheses.
Holmes B, Steigerwalt AG, Weaver RE, Brenner DJ: Chryseomonas luteola comb. nov. and Flavimonas oryzihabitans gen. nov., comb. nov., Pseudomonas-like species from human clinical specimens and formerly known, respectively, as groups Ve-1 and Ve-2. Int J Syst Bacteriol. 1987, 37: 245-250.
Anzai Y, Kudo Y, Oyaizu H: The phylogeny of the genera Chryseomonas, Flavimonas, and Pseudomonas supports synonymy of these three genera. Int J Syst Bacteriol. 1997, 47: 249-251.
Freney J, Hansen W, Etienne J, Vandenesch F, Fleurette J: Postoperative infant septicemia caused by Pseudomonas luteola (CDC group Ve-1) and Pseudomonas oryzihabitans (CDC group Ve-2). J Clin Microbiol. 1988, 26: 1241-1243.
Silver MR, Felegie TP, Sorkin MI: Unusual bacterium, group Ve-2, causing peritonitis in a patient on continuous ambulatory peritoneal dialysis. J Clin Microbiol. 1985, 21: 838-839.
Berger SA, Siegman-Igra Y, Stadler J, Campus A: Group VE-1 septicemia. J Clin Microbiol. 1983, 17: 926-927.
Drancourt M, Bollet C, Carlioz A, Martelin R, Gayral JP, Raoult D: 16S ribosomal DNA sequence analysis of a large collection of environmental and clinical unidentifiable bacterial isolates. J Clin Microbiol. 2000, 38: 3623-3630.
Weisburg WG, Barns SM, Pelletier DA, Lane DJ: 16S ribosomal DNA amplification for phylogenetic study. J Bacteriol. 1991, 173: 697-703.
Lepidi H, Durack DT, Raoult D: Diagnostic methods current best practices and guidelines for histologic evaluation in infective endocarditis. Infect Clin North America. 2002, 16: 339-361,ix. 10.1016/S0891-5520(02)00005-3.
Engel JM, Alexander FS, Pachucki CT: Bacteremia caused by CDC group Ve-1 in previously healthy patient with granulomatous hepatitis. J Clin Microbiol. 1987, 25: 2023-2024.
Rahav G, Simhon A, Mattan Y, Moses AE, Sacks T: Infections with Chryseomonas luteola (CDC group Ve-1) and flavimonas oryzihabitans (CDC group Ve-2). Medicine (Baltimore). 1995, 74: 83-88. 10.1097/00005792-199503000-00003.
Rastogi S, Sperber SJ: Facial cellulitis and Pseudomonas luteola bacteremia in an otherwise healthy patient. Diagn Microbiol Infect Dis. 1998, 32: 303-305. 10.1016/S0732-8893(98)00082-0.
Hawkins RE, Moriarty RA, Lewis DE, Oldfield EC: Serious infections involving the CDC group Ve bacteria Chryseomonas luteola and Flavimonas oryzihabitans. Rev Infect Dis. 1991, 13: 257-260.
O'Leary T, Fong IW: Prosthetic valve endocarditis caused by group Ve-1 bacteria (Chromobacterium typhiflavum). J Clin Microbiol. 1984, 20: 995-
Chihab W, Alaoui AS, Amar M: Chryseomonas luteola identified as the source of serious infections in a Moroccan University Hospital. J Clin Microbiol. 2004, 42: 1837-1839. 10.1128/JCM.42.4.1837-1839.2004.
The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2334/5/82/prepub
Informed consent was obtained from the patient
The author(s) declare that they have no competing interests.
JPC isolated the microorganism, initiated the antibiotic therapy, and drafted the manuscript; PEF identified the microorganism and drafted the manuscript; GH performed the echocardiograms and drafted the manuscript; AR performed valvular surgery and drafted the manuscript; DR helped drafting the manuscript.