# Chryseobacterium indologenes Septicemia in an Infant

Authors: Turkan Aydin Teke; Fatma Nur Oz; Ozge Metin; Gulsum Iclal Bayhan; Zeynep Gökce Gayretli Aydin; Melek Oguz; Gonul Tanir
Journal: Case Reports in Infectious Diseases
 (2014)

---

## Abstract

Chryseobacterium indologenes is a rare cause of infection in children. The organism causes infections mostly in hospitalised patients with severe underlying diseases. The choice of an effective drug for the treatment of infections due to C. indologenes is difficult as the organism has a limited spectrum of antimicrobial sensitivity. We present a case of nosocomial septicemia caused by C. indologenes in an infant with congenital heart disease who was successfully treated with trimethoprim sulfamethoxazole and also reviewed fourteen additional cases of C. indologenes infections reported in the English literature in this report.


---

## Body

## 1. Introduction

Chryseobacterium indologenes is nonmotile, catalase-positive, oxidase-positive, indole-positive, non-glucose-fermenting Gram-negative bacilli. It is not a component of human flora although it is widely distributed in nature.C. indologenes is a rare organism that has been reported to cause infections mostly in hospitalised patients with severe underlying diseases [1, 2]. The appropriate antibiotic choice is challenging as the organism shows resistance to multiple antibiotics. This report describes a case ofC. indologenes nosocomial septicemia in an infant with congenital heart disease and reviews previously reported infections byC. indologenes in pediatric age group.


## 2. Case Report

A three-month-old female infant born at term by vaginal delivery presented to our hospital with cough and irritability. Atrioventricular septal defect was diagnosed when she was 15-day-old and she was on followup by cardiology clinic. On admission she had tachypnea and cardiac murmur on auscultation. All the other physical examinations of her were unremarkable. A complete blood count showed a white blood cell (WBC) count of 11.000/mm³ with 60% lymphocytes and C-reactive protein (CRP) level was 1 mg/L (range, 0–8 mg/L). Serum biochemical investigations were in normal range. Chest X-ray showed hyperinflation and peribronchiolar wall thickening. She was hospitalized for acute community acquired pneumonia and ampicillin sulbaktam plus clarithromycin was initiated. Respiratory virus multiplex polymerase chain reaction (PCR) obtained at admission revealed respiratory syncytial virus. Blood culture was performed since her clinical condition deteriorated and fever occurred on day 6.Candida albicans was isolated on blood culture and she was treated for nosocomial candidemia with caspofungin for 21 days, serial blood cultures were negative, and she was discharged in a good clinical condition. Four days after discharge, she was rehospitalized for the diagnosis of nosocomial pneumonia and empirically treated with meropenem and caspofungin intravenously. Blood and urine cultures showed no growth. During the hospitalization, fever up to 39°C occurred. She had a central venous catheter and her remaining physical examination was unremarkable. Laboratory investigations were as follows: hemoglobin 9.5 mg/dL, WBC 22.200/mm3 with 70% neutrophil, platelets 516.000/mm3, and CRP 21.1 mg/L. Chest X-ray showed no new infiltration and also abdominal ultrasonography and echocardiography did not show any infectious focus. Central venous catheter was removed because of obstruction. Specimen from peripheral blood culture yielded yellow colonies on blood agar (Figure 1).C. indologenes was identified by conventional methods and VITEK 2 ID-AST (bioMérieux, France) automatized system. Antimicrobial susceptibility testing of the organism revealed resistance to amikacin, gentamicin, ceftazidime, cefepime, piperacillin tazobactam, cefoperazone sulbactam, imipenem, meropenem, colistin, tetracycline, and ciprofloxacin and was susceptible to only trimethoprim sulfamethoxazole (TMP-SMX). TMP-SMX (20 mg/kg/day, intravenously) was initiated. Her fever resolved and blood culture became negative after 48 hours of the treatment. The antibiotic treatment was given for a course of 21 days. After discharge she was operated on in another hospital. She has been on followup in a good clinical condition for seven months.Figure 1
Yellow colonies ofChryseobacterium indologenes on blood agar.


## 3. Discussion

The genusChryseobacterium(previouslyFlavobacterium) belongs to the family Flavobacteriaceae that are ubiquitous in nature and are inhabitants of soil and water and can be recovered from a variety of foods. They can be found in municipal water supplies despite adequate chlorination and can be recovered from the hospital environment [3]. Contamination of the medical devices containing water (respirators, intubation tubes, humidifiers, etc.) in hospital settings may lead to serious infections.C. indologenes colonies usually form a dark-yellow pigment in culture as a result of the production of the pigment flexirubin.C. indologenes is a rare cause of human disease.C. indologeneswas first isolated from a clinical specimen in 1993 from the tracheal aspirate of a patient with ventilator-associated pneumonia [4].Chryseobacteria represent only 0.27% (50 of 18,569) of the processed nonfermentative Gram-negative bacilli and 0.03% (50 of 155,811) of all bacterial isolates collected by the SENTRY Surveillance Program during the 5-year period 1997 to 2001 [5].C. indologenesinfections have been shown as a cause for a variety of invasive infections especially in patients with risk factors, such as intravascular catheter-related bacteremia, bacteremia associated with malignancy and neutropenia, nosocomial pneumonia, cellulitis, meningitis, peritonitis, and surgical wound infections [2, 6–11]. A total of 14 cases ofC. indologenes infections in pediatric age group were found in English literature. The diagnoses of the reported cases were bacteremia (six cases), meningitis (five cases), ventilator-associated pneumonia (two cases), and lumboperitoneal shunt infection (one case). Ten of 14 patients had medical devices, 12 of 14 patients had comorbidity, and 12 of 14 patients were ≤2 years old. The summary of cases is presented in Table 1.Table 1
Demographic and clinical characteristics ofChryseobacterium  indologenes infections in pediatric patients.
Patient no.
Reference/year
Age/sex
Comorbidity
Medical devices present
Clinical syndrome
Antibiotic
Outcome
1
Hsueh et al., 1996 [2, 6]
1 mo/M
Burns
Ventilator
Ventilator-associated pneumonia
Ciprofloxacin, cefoxitin, amikacin
Died (ARDS)
2
Hsueh et al., 1996 [2, 6]
5 mo/F
Neuroblastoma, chemotherapy
Hickman catheter
Bacteremia
Not stated
Recovery without removal of catheter (after 3 days)
3
Hsueh et al., 1996 [2, 6]
1 mo/F
Hepatoblastoma, chemotherapy
Port-A-catheter
Bacteremia
Not stated
Recovery without removal of catheter (after 3 days)
4
Cascio et al., 2005 [13]
2 y/M
Type 1 diabetes mellitus
Peripheral catheter
Bacteremia
Ceftriaxone, 10 days
Recovery with removal of catheter (afebrile after 2 days)
5
Al-Tatari et al., 2007 [14]
13 y/M
Congenital hydrocephalus
Lumboperitoneal shunt
Lumboperitoneal shunt infection
TMP-SMX and rifampin (for 14 d after shunt removal)
Recovery 24 h after shunt removal
6
Bayraktar et al., 2007 [15]
5 mo/M
Down syndrome, operation for atrial septal defect and diaphragmatic hernia
Mechanical ventilation
Bacteremia
Vancomycin and ofloxacin
Died
7
Douvoyiannis et al., 2010 [16]
33 d/F
None
None
Bacteremia
Cefepime, 10 days
Recovery (afebrile after a day)
8
Ceylan et al., 2011 [17]
2 mo/M
Hydrocephaly
External shunt
Meningitis sepsis
Ampicillin sulbactam and levofloxacin
Died (cardiopulmonary arrest)
9
Calderón et al., 2011 [8]
20 d/M
Congenital heart disease
Mechanical ventilation
Ventilator-associated pneumonia
Piperacillin-tazobactam (14 days)
Recovery
10
Kodama et al., 2013 [18]
3 y/F
Acute myeloid leukemia unrelated cord blood stem cell transplantation
Central venous catheter
Catheter-related bloodstream infection
Ciprofloxacin and minocycline
Recovery with removal of catheter
11
Ozcan et al., 2013 [19]
6 mo/M
Congenital hydrocephalus, prematurity
Ventriculoperitoneal shunt
Meningitis
TMP-SMX and cefoperazone-sulbactam (14 days)
Recovery with removal of shunt
12
Hendaus et al., 2013 [20]
8 d/F
None
None
Meningitis
Cefepime (21 days)
Recovery (afebrile after 2 days)
13
Eshwara et al., 2014 [10]
6 d/F
Small for gestational age
None
Meningitis sepsis
TMP-SMX (2 weeks) and ciprofloxacin (6 weeks)
Recovery
14
Olbrich et al., 2014 [21]
11 mo/M
Holoprosencephaly, suboptimal hygienic conditions
Ventriculoperitoneal shunt
Meningitis
TMP-SMX and ceftazidime (21 days)
Recovery (afebrile in 24 h) with complete removal of the cerebrospinal shunt system
15
This study, 2014
3 mo/F
Congenital heart disease
Central venous catheter
Bacteremia
TMP-SMX (21 days)
Recovery (afebrile after 2 days)Chryseobacteria have low pathogenicity and cause infections mostly in hospitalised patients with risk factors including underlying medical illness, age (newborn or elderly) underlying immunocompromising conditions, presence of indwelling intravascular devices, and prolonged exposure to broad-spectrum antibiotics. The present case had congenital heart disease, central venous catheter, and prolonged usage of broad-spectrum antibiotics as risk factors.The choice of an effective drug for the empirical treatment of infections due toC. indologenesis difficult as the organism has a limited spectrum of antimicrobial sensitivity.Chryseobacterium organisms produce β-lactamases and are resistant to most β-lactam drugs, including the carbapenems and aztreonam [3]. In a study that included 215C. indologenesisolates, TMP-SMX and cefoperazone-sulbactam remained the most active agent especially for bloodstream infections. Authors concluded that, after introduction of colistin and tigecycline usage because of emerging resistant pathogens, the prevalence ofC. indologenes infection increased [12]. According to the results of the SENTRY Antimicrobial Surveillance Program, the most active agents againstC. indologenes are the newer quinolones (garenoxacin, gatifloxacin, and levofloxacin, ≥95% susceptibility) and TMP-SMX (95% susceptibility), followed by piperacillin-tazobactam (90% susceptibility). Ciprofloxacin, cefepime, ceftazidime, piperacillin, and rifampin showed reasonable activity (85% susceptibility) [5]. On the contrary, other β-lactams, aminoglycosides, chloramphenicol, linezolid, and glycopeptides are not appropriate for treating infections caused by this organism. According to more recent report it was suggested that only newer fluoroquinolones and TMP-SMX could possibly represent the most appropriate antimicrobial agents [1].In conclusionC. indologenes may cause nosocomial septicemia in infants with the risk factors as underlying prolonged hospitalization, prolonged usage of broad-spectrum antibiotics, and having comorbidity. The microorganism may have resistance to most antimicrobial agents empirically prescribed for nosocomial Gram-negative infections. For this reason, whenC. indologenes is isolated in normally sterile sites of body, antimicrobial susceptibility test results are important to assure appropriate antibiotic coverage. This case report demonstrated that TMP-SMX may be the only appropriate antimicrobial agent to treat bacteremia caused by this pathogen.



---

*Source: 270521-2014-07-10.xml*