Achromobacter Spp.: A retrospective review of rare and emerging pathogen

Background: Achromobacter spp. is a rare nosocomial pathogen known to cause many serious infections like bloodstream infection, osteomyelitis, meningitis, urinary tract infections, corneal ulceration, peritonitis, and endocarditis. Materials and Methods: In this study, we retrospectively analyzed all the bacteriological sample records from the bacteriology database from January 2021 to December 2021 to determine the prevalence of Achromobacter spp. Result: Nine patients with Achromobacter xylosoxidans causing bacterial infection were identified, from whom five blood samples, two pus, one respiratory sample, one central venous pressure (CVP), and one cerebrospinal fluid were found positive for Achromobacter spp., among whom one was a 6-year-old patient having the same organism from two different body sites—CVP line and cerebrospinal fluid. Five patients had coinfection with another organism, whereas acute kidney injury was the most common comorbidity. Conclusion: In our single-center experience, approximately 50% of the cases with Achromobacter denitrificans bacteremia suffered from chronic kidney disease and had a history of antibiotic therapy, hospitalization, and the presence of devices. Active research on rising trends of Achromobacter spp. needs to be promoted.

Report of two events of nosocomial outbreak and pseudo-outbreak due to contamination with Achromobacter spp / Comunicación de 2 eventos de brote y seudobrote nosocomial debido a contaminación con Achromobacter spp

Abstract Achromobacter spp. are increasingly recognized as emerging pathogens in immunocompromised patients or suffering cystic fibrosis, but unusual in immunocompetent hosts or individuals that underwent surgery. In this study we describe two simultaneous events attributable to two different Achromobacter spp. contaminated sources. One event was related to an episode of pseudo-bacteremia due to sodium citrate blood collection tubes contaminated with Achromobacter insuavis and the other to Achromobacter genogroup 20 infection and colonization caused by an intrinsically contaminated chlorhexidine soap solution. Both threatened the appropriate use of antimicrobials. Molecular approaches were critical to achieving the accurate species identification and to assess the clonal relationship, strengthening the need for dedicated, multidisciplinary and collaborative work of microbiologists, specialists in infectious diseases, epidemiologists and nurses in the control of infections to clarify these epidemiological situations.

Resumen Achromobacter spp. son reconocidas con mayor frecuencia como patógenos emergentes en pacientes con fibrosis quística e inmunodeprimidos, pero son inusuales en hospedadores inmunocompetentes o quirúrgicos. En este estudio describimos 2 eventos simultáneos atribuibles a 2 fuentes contaminadas con Achromobacter spp. Uno correspondió a un episodio de seudobacteriemia por tubos de citrato de sodio contaminados con Achromobacter insuavis y el otro a infecciones y colonizaciones debidas al uso de solución jabonosa de clorhexidina intrínsecamente contaminada con Achromobacter genogrupo 20. Ambos episodios pusieron en peligro el uso apropiado de antimicrobianos. Los enfoques moleculares fueron fundamentales para lograr la identificación precisa de las especies y evaluar la relación clonal de los aislamientos, lo que refuerza la necesidad del trabajo perseverante y multidisciplinario de microbiólogos, especialistas en enfermedades infecciosas, epidemiólogos y enfermeras en el control de infecciones para el esclarecimiento de estas situaciones epidemiológicas.

Full characterization of plasmids from Achromobacter ruhlandii isolates recovered from a single patient with cystic fibrosis (CF) / Caracterización completa de plásmidos provenientes de aislamientos de Achromobacter ruhlandii recuperados de un único paciente con fibrosis quística

Abstract In the last decade Achromobacter spp. has been associated with chronic colonizationin patients with cystic fibrosis (CF). Although Achromobacter xylosoxidans is the most frequentspecies recovered within this genus, other species such as A. ruhlandii have also been reportedin these patients. Descriptions of mobile elements are scarce in Achromobacter and none ofthem have been originated in A. ruhlandii. The aim of this study was to report the full char-acterization of a plasmid which was maintained in four clonally related A. ruhlandii isolates.Between 2013 and 2015, nine A. ruhlandii isolates were recovered from a pediatric patientwith CF at a hospital in Buenos Aires. Four selected clonally related isolates were sequencedby Illumina MiSeq, annotated using RAST and manually curated. The presence of a unique plas-mid of 34096-bp and 50 CDS was observed in the four isolates, displaying only 1 nucleotidesubstitution translated into one amino acid change among them. These plasmids have a class 1integron containing the aac-(6)-Ib gene, a mercury resistance operon region and the relE/stbEtoxin/antitoxin system. Plasmids showed 79% similarity and 99% identity with pmatvim-7 fromPseudomonas aeruginosa. This is the first full description and characterization of a plasmid fromA. ruhlandii which was maintained over time.

Resumen Durante la última década, Achromobacter spp. han sido asociadas con la colonización crónica en pacientes con fibrosis quística. Si bien Achromobacter xylosoxidans es la especie más frecuentemente recuperada, otras especies como Achromobacter ruhlandii también fueron reportadas en nuestra región. Sin embargo, pocos reportes se han centrado en la descripción de elementos móviles, y ninguno de ellos los documenta en A. ruhlandii. El objetivo de este estudio fue reportar la caracterización completa de un plásmido conservado en 4 aislamientos clonalmente relacionados de A. ruhlandii. Se recuperaron 9 aislamientos de A. ruhlandii entre 2013 y 2015 de un único paciente con fibrosis quística proveniente de un hospital pediátrico de Buenos Aires, Argentina. Se realizó la secuenciación completa del genoma de los 4 aislamientos seleccionados según el perfil de resistencia antibiótica en un equipo Illumina MiSeq. Estos fueron anotados mediante RAST y curados manualmente. Se detectó la presencia de un solo plásmido de 34.096 pb y 50CDS en los 4 aislamientos, observándose únicamente un cambio nucleotídico traducido en un cambio aminoacídico en un aislamiento. Los plásmidos ensamblados se caracterizaron por presentar un integrón de clase 1 que contenía el gen aac-(6')-Ib, un operón de resistencia a mercurio y el sistema de toxina-antitoxina relE/stbE. Cabe destacar que estos plásmidos poseen un 79% de similitud y un 99% de identidad con el plásmido pmatvim-7 de Pseudomonas aeruginosa. Esta es la primera descripción y caracterización completa de un plásmido proveniente de A. ruhlandii.

Comparison of nutrient-rich and limited media in the production of biosurfactant by Achromobacter xylosoxidans BP(1)5

Aims@#This study aims to produce Achromobacter biosurfactant in nutrient-rich and nutrient-limited media.@*Methodology and results@#This study conducted fermentation on nutrient-rich and nutrient-limited media using a minimal salt medium (MSM). Dextrose and sodium citrate were used as sole carbon supplemented with 0.5% yeast extract for nutrient-rich media, while nutrient-limited media used molasses and rice straw hydrolysate (RSH) at variations of concentrations of 100 ppm and 200 ppm. The research was performed over 120 h and evaluated from growth response, surface tension and emulsification activity. The study revealed that the best surface tension value was when 2% (w/v) sodium citrate was used as C-source and 0.5% (w/v) yeast extract as N-source, after 72 h upon incubation at 30 °C/120 rpm having 45.45 ± 2.19 mN/m with emulsification activity 24.54 ± 3.42%. Whereas the best result of the nutrient-limited medium was obtained by RSH at a concentration of 200 ppm having 48.86 ± 5.36 mN/m.@*Conclusion, significance and impact of study@#The experiment showed that nutrient-limited medium from rice straw hydrolysate could compete with the nutrient-rich medium. The use of rice straw will contribute to the reduction of biosurfactant production costs and valorisation of agricultural waste.

Diversity of Achromobacter species recovered from patients with cystic fibrosis, in Argentina / Diversidad de las especies de Achromobacter recuperadas de pacientes con fibrosis quística en Argentina

Abstract Different phenotype-based techniques and molecular tools were used to describe the distribution of different Achromobacter species in patients with cystic fibrosis (CF) in Argentina, and to evaluate their antibiotic resistance profile. Phenotypic identification was performed by conventional biochemical tests, commercial galleries and MALDI-TOF MS. Genetic approaches included the detection of A. xylosoxidans specific marker blaoxa-114, the amplificaron and sequencing of the 16S rRNA gene, nrdA and blaOXA complete sequence, and MLST analysis. Phenotypic approaches, even MALDI-TOF, rendered inconclusive or misleading results. On the contrary, concordant results were achieved with the nrdA sequencing or sequence type (ST) analysis, and the complete blaOXA sequencing, allowing a reliable discrimination of different Achromobacter species. A. xylosoxidans accounted for 63% of Achromobacter infections and A. ruhlandii accounted for 17%. The remaining species corresponded to A. insuavis, A. dolens, A. marplatensis and A. pulmonis. Antimicrobial susceptibilities were determined by the agar dilution method according to CLSI guidelines. Piperacillin, piperacillin/tazobactam and car-bapenems were the most active antibiotics. However, the emergence of carbapenem-resistant isolates was detected. In conclusion, prompt and accurate identification tools were necessary to determine that different Achromobacter species may colonize/infect the airways of patients with CF. Moreover, antimicrobial therapy should be administered based on the susceptibility profile of individual Achromobacter sp. isolates. © 2019 Asociación Argentina de Microbiología. Published by Elsevier España, S.L.U. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/).

Resumen Se emplearon diversas técnicas fenotípicas y moleculares para describir la distribución de diferentes especies del género Achromobacter en pacientes con fibrosis quística (FQ) en Argentina, y se evaluó el perfil de resistencia a los antibióticos. Se realizó la identificación fenotípica por pruebas bioquímicas convencionales, galerías comerciales y MALDI-TOF MS. El enfoque genético incluyó la detección del marcador especie-específico de A. xylosoxidans bla[PRESERVECIRC]tu, la amplificación y la secuenciación de los genes ARNr 16S, nrdA y secuencia completa de blaOXA, y el análisis por MLST. Los enfoques fenotípicos, incluso la técnica de MALDI-TOF, proporcionaron resultados no concluyentes o erróneos. Por el contrario, se obtuvieron resultados concordantes entre la secuenciación del gen nrdA o el análisis de secuenciotipos (ST) y la secuenciación completa de blaOXA, lo que permitió una discriminación confiable de las diferentes especies de Achromobacter. A. xylosoxidans representó el 63% de las infecciones por Achromobacter y A. ruhlandii representó el 17%. Las especies restantes correspondieron a A. insuavis, A. dolens, A. marplatensis y A. pulmonis. Se determinó la sensibilidad a antimicrobianos por el método de dilución en agar de acuerdo al CLSI. Los antibióticos más activos fueron piperacilina, piperacilina/tazobactam y carbapenemes. Sin embargo, se detectó la emergencia de aislamientos resistentes a carbapenemes. En conclusión, resultaron necesarias herramientas de identificación rápida y precisas para determinar las diferentes especies del género Achro-mobacter capaces de colonizar/infectar las vías respiratorias de los pacientes con FQ. Asimismo, la terapia antimicrobiana debería llevarse a cabo en función del perfil de sensibilidad de los aislamientos individuales de Achromobacter spp. © 2019 Asociacion Argentina de Microbiología. Publicado por Elsevier Espana, S.L.U. Este es un artículo Open Access bajo la licencia CC BY-NC-ND (https://creativecommons.org/licenses/by-nc-nd/4.0/).

Isolation and Antibiotic Resistance of Achromobacter xylosoxidans from Non-respiratory Tract Clinical Samples: A 10-year Retrospective Study in a Tertiary-care Hospital in Hungary

Aims: To assess the prevalence of A. xylosoxidansisolated from non-respiratory tract samples from adult inpatients and outpatients and the antibiotic resistance levels at a tertiary-care teaching hospital in Szeged, Hungary retrospectively, during a 10-year study period.Study Design:Retrospective microbiological study.Place and Duration of Study:1stof January 2008 -31stof December 2017 at the University of Szeged, which is affiliated with the Albert Szent-Györgyi Clinical Center, a primary-and tertiary-care teaching hospital in the Southern GreatPlain of Hungary.Methodology:Data collection was performed electronically. Antimicrobial susceptibility testing (AST) was performed using disk diffusion method and when appropriate, E-tests on Mueller–Hinton agar plates. Results:During the 10-year study period, a total of 68 individual A. xylosoxidansisolates were identified (6.8±3.6/year, range: 0-11 isolates). The frequency of isolation in the first half of the study period (2008-2017) was n=22, while in 2013-2017, this number was n=46. The majorityof isolates (51 out of 68) were from inpatient departments. 32 out of 68 patients were female (female-to-male ratio: 0.89).The susceptibilities of the respectiveA. xylosoxidansisolates (n=68) were the following: high levels of susceptibility for imipenem and meropenem (n=63; 92.6%), and moxifloxacin (n=55; 80.9%), while higher rates of resistance were detected for sulfamethoxazole/trimethoprim (susceptible: n=36; 52.9%), ciprofloxacin (susceptible: n=40; 58.8%) and almost all isolates were resistant to ceftazidime (susceptible: n=3; 4.4%) and cefepime (n=2; 2.9%).Conclusion:The existing literature on Achromobacterinfections in the context of non-respiratory human infections is scarce, as the incidence of these pathogens in clinically-relevant syndromes in low. The developments in diagnostic technologies in routine clinical microbiology will probably lead to a shift in the isolation frequency of these bacteria in the future

Achromobacter: an emerging nosocomial pathogen

Background: Achromobacter is a ubiquitous, non-fermenting, Gram-negative bacterium that lives in soil and aquatic environments. In recent years, many studies have shown its potential as opportunistic pathogen. It can colonize various items used in hospital and can survive various disinfectants. The infections get complicated due to its vast spectrum of intrinsic and extrinsic resistance to antimicrobial agents and disinfectants. Achromobacter spp. is an emerging pathogen and is becoming a reservoir for horizontal genetic transfer elements involved in spreading antibiotic resistance. This study was conducted to assess the extent of the Achromobacter related infection in our hospital setting and to set a baseline for future studies.Methods: This study was conducted over a period of one year (January to December 2018) in our tertiary care hospital. All specimens submitted for aerobic culture and sensitivity were analyzed and the bacterial identification and antibiotic sensitivity of the isolates was carried out using automated method (Vitek 2 Compact, bioMerieux).Results: Achromobacter species was reported from 0.46% (63/13831) specimens, 40% of them were isolated from suction tips. Achromobacter denitrificans amounted for 47/63 (74.6%) while Achromobacter xylosoxidans was identified in 16/63 (25.4%).Conclusions: Studying the organisms in order to observe their changing trends

A Rare Instance of Recurrent Achromobacter Infection in an Immune- Competent Individual

Introduction: Achromobacter xylosoxidans is a rare pathogenthat causes opportunistic and rarely, nosocomial infectionsin immune-compromised patients, with high mortality. Weencountered a rare presentation of recurrent A.xylosoxidansinfection in an immune-competent individual.Case Report: A 40-year-old lady presented with a rightscapular swelling for 1 week. She had mild pain and lowgrade fever. She had no comorbidities apart from a pastlaparoscopic cholecystectomy for cholelithiasis. Monthslater, she was diagnosed with multiple liver abscesses, withA.xylosoxidans as the causative organism gown in culture. Shewas asymptomatic for 2 years thereafter. The right scapularswelling was diffuse, non-tender and non-erythematous.Conclusion: A.xylosoxidans rarely causes liver abscesses,although there have been few reports of similar cases in patientsfollowing cholecystectomy, similar to the case in discussion,indicating a possible association between cholecystectomyand A.xylosoxidans infection, even in immune-competentpatients. Infection may be recurrent, and may requireprolonged antibiotic therapy and close surveillance.

Achromobacter xylosoxidans Bacteremia in a Child with Neutropenia

Achromobacter xylosoxidans is a non-fermentative, aerobic, oxidase, and catalase-positive Gram-negative rod similar to Pseudomonas species. This organism colonizes aquatic environments and can cause nosocomial infections, especially in patients with immune deficiency such as human immunodeficiency virus infection, cancer, cystic fibrosis, neutropenia, and immunoglobulin M deficiency. Infections are found as bacteremia, pneumonia, meningitis, urinary tract infection, abscess formation, and osteomyelitis. It is known that most effective antibiotics are piperacillin/tazobactam, meropenem, and trimethoprim/sulfamethoxazol. But there is no optimal antibiotic therapy so far. We present a case of Achromobacter xylosoxidans bacteremia in a 13-month-old Korean girl who had past history of neutropenia.

Native-valve endocarditis caused by Achromobacter xylosoxidans: a case report and review of literature

Achromobacter xylosoxidans is a Gram-negative aerobic bacterium first described by Yabuuchi and Ohyama in 1971. A. xylosoxidans is frequently found in aquatic environments. Abdominal, urinary tract, ocular, pneumonia, meningitis, and osteomyelitis are the most common infections. Infective endocarditis is rare. As far as we know, until now, only 19 cases have been described, including this current report. We report the case of community-acquired native valve endocarditis caused by A. xylosoxidans in an elderly patient without a concomitant diagnosis of a malignancy or any known immunodeficiency. The patient presented with a 2-month history of fever, weight loss, and progressive dyspnea. On physical examination, mitral and aortic murmurs were present, along with Janeway's lesions, and a positive blood culture for A. xylosoxidans. The transesophageal echocardiogram showed vegetation in the aortic valve, which was consistent with the diagnosis of infective endocarditis

Identification and phylogenetic analysis for Achromobacter xylose Oxidas in porcine pneumonia / 中国人兽共患病学报

To identify the pathogen of an outbreak of pneumouia in pig-farm,we used biochemical identification,pathoge nicity test in mice,PCR identification by 16S rRNA,and phylogenetic tree analysis for the identification.Results showed that the pathogen was an Achromobacter xylosoxidans with certain virulence and named TLSY-1.This TLSY-1 was the most simi lar to KF879922.1,and affinity rate were 99.9％ by homology analysis.This result identified that TLSY-1 is a new pneumonia pathogens in piglets.

Draft genome sequences of four Achromobacter ruhlandii strains isolated from cystic fibrosis patients

Achromobacter species are being increasingly isolated from the respiratory tract of cystic fibrosis patients. Recent reports indicate that Achromobacter ruhlandii is a potential human pathogen in cystic fibrosis-related infections. Here we report the draft genome of four A. ruhlandii strains isolated from cystic fibrosis patients in Brazil. This report describes A. ruhlandii as a potential opportunistic pathogen in cystic fibrosis and provides a framework to for additional enquires into potential virulence factors and resistance mechanisms within this species.

Soil bacteria showing a potential of chlorpyrifos degradation and plant growth enhancement

ABSTRACT Background: Since 1960s, the organophosphate pesticide chlorpyrifos has been widely used for the purpose of pest control. However, given its persistence and toxicity towards life forms, the elimination of chlorpyrifos from contaminated sites has become an urgent issue. For this process bioremediation is the method of choice. Results: Two bacterial strains, JCp4 and FCp1, exhibiting chlorpyrifos-degradation potential were isolated from pesticide contaminated agricultural fields. These isolates were able to degrade 84.4% and 78.6% of the initial concentration of chlorpyrifos (100 mg L-1) within a period of only 10 days. Based on 16S rRNA sequence analysis, these strains were identified as Achromobacter xylosoxidans (JCp4) and Ochrobactrum sp. (FCp1). These strains exhibited the ability to degrade chlorpyrifos in sterilized as well as non-sterilized soils, and were able to degrade 93-100% of the input concentration (200 mg kg-1) within 42 days. The rate of degradation in inoculated soils ranged from 4.40 to 4.76 mg-1 kg-1 d-1 with rate constants varying between 0.047 and 0.069 d-1. These strains also displayed substantial plant growth promoting traits such as phosphate solubilization, indole acetic acid production and ammonia production both in absence as well as in the presence of chlorpyrifos. However, presence of chlorpyrifos (100 and 200 mg L-1) was found to have a negative effect on indole acetic acid production and phosphate solubilization with percentage reduction values ranging between 2.65-10.6% and 4.5-17.6%, respectively. Plant growth experiment demonstrated that chlorpyrifos has a negative effect on plant growth and causes a decrease in parameters such as percentage germination, plant height and biomass. Inoculation of soil with chlorpyrifos-degrading strains was found to enhance plant growth significantly in terms of plant length and weight. Moreover, it was noted that these strains degraded chlorpyrifos at an increased rate (5.69 mg-1 kg-1 d-1) in planted soil. Conclusion The results of this study clearly demonstrate that the chlorpyrifos-degrading strains have the potential to develop into promising candidates for raising the productivity of crops in pesticide contaminated soils.

Optimal condition for preservation of three Achromobacter xylosoxidans bacteriophages / 军事医学

Objective To find simple and effective methods of preservation for Achromobacter xylosoxidans bacteriophages.Methods The plaque forming unit( PFU) of surviving phages under different preservation conditions and temperatures at different time points was determined.Results and Conclusion The titers of phiAxp-1 and phiAxp-2 main-tained at the initial 1010 PFU/ml, and that of phiAxp-3 decreased slightly from 1011 PFU/ml to 1010 PFU/ml 16 months after the three Achromobacter xylosoxidans bacteriophages were stored in glycerol and dimethyl sulfoxide at -80℃, -20℃and 4℃.When stored in chloroform at 4℃for 16 months, the titers of all the three phages decreased slightly but were higher than at other temperatures (-80℃, -20℃, room temperature, and 37℃) .Thus these methods can effectively preserve Achromobacter xylosoxidans bacteriophages.

Clinical impact of Achromobacter xylosoxidans colonization/infection in patients with cystic fibrosis

The rate of diagnosis of colonization/infection of the airways with Achromobacter xylosoxidans has increased in cystic fibrosis patients, but its clinical significance is still controversial. This retrospective, case-control study aimed to evaluate the clinical impact of A. xylosoxidans colonization/infection in cystic fibrosis patients. Individuals who were chronically colonized/infected (n=10), intermittently colonized/infected (n=15), and never colonized/infected with A. xylosoxidans (n=18) were retrospectively evaluated during two periods that were 2 years apart. Demographic characteristics, clinical data, lung function, and chronic bacterial co-colonization data were evaluated. Of the total study population, 87% were pediatric patients and 65.1% were female. Individuals chronically colonized/infected with A. xylosoxidans had decreased forced expiratory volume in 1 s (51.7% in the chronic colonization/infection group vs 82.7% in the intermittent colonization/infection group vs 76% in the never colonized/infected group). Compared with the other two groups, the rate of co-colonization with methicillin-resistant Staphylococcus aureus was higher in individuals chronically colonized/infected with A. xylosoxidans (P=0.002). Changes in lung function over 2 years in the three groups were not significant, although a trend toward a greater decrease in lung function was observed in the chronically colonized/infected group. Compared with the other two groups, there was a greater number of annual hospitalizations in patients chronically colonized/infected with A. xylosoxidans (P=0.033). In cystic fibrosis patients, there was an increased frequency of A. xylosoxidans colonization/infection in children, and lung function was reduced in patients who were chronically colonized/infected with A. xylosoxidans. Additionally, there were no differences in clinical outcomes during the 2-year period, except for an increased number of hospitalizations in patients with A. xylosoxidans.

A Case of Septic Shock caused by Achromobacter xylosoxidans in an Immunocompetent Female Patient after Extracorporeal Shock Wave Lithotripsy for a Ureteral Stone

Achromobacter xylosoxidans can cause various types of infections, but its infection in humans is rare. A. xylosoxidans has been reported as a rare etiological agent of infections including primary bacteremia, catheter-related bloodstream infection, endocarditis, otitis, and pneumonia, particularly in immunocompromised hosts. We encountered a case of septic shock caused by A. xylosoxidans in a 52-year-old, immunocompetent woman with no underlying disease, who received extracorporeal shock wave lithotripsy to remove a left upper ureteral stone. She was treated with antibiotics to which the organism was susceptible but died as a result of septic shock.

Carbazole degradation in the soil microcosm by tropical bacterial strains

In a previous study, three bacterial strains isolated from tropical hydrocarbon-contaminated soils and phylogenetically identified as Achromobacter sp. strain SL1, Pseudomonas sp. strain SL4 and Microbacterium esteraromaticum strain SL6 displayed angular dioxygenation and mineralization of carbazole in batch cultures. In this study, the ability of these isolates to survive and enhance carbazole degradation in soil were tested in field-moist microcosms. Strain SL4 had the highest survival rate (1.8 x 107 cfu/g) after 30 days of incubation in sterilized soil, while there was a decrease in population density in native (unsterilized) soil when compared with the initial population. Gas chromatographic analysis after 30 days of incubation showed that in sterilized soil amended with carbazole (100 mg/kg), 66.96, 82.15 and 68.54% were degraded by strains SL1, SL4 and SL6, respectively, with rates of degradation of 0.093, 0.114 and 0.095 mg kg−1 h−1. The combination of the three isolates as inoculum in sterilized soil degraded 87.13% carbazole at a rate of 0.121 mg kg−1 h−1. In native soil amended with carbazole (100 mg/kg), 91.64, 87.29 and 89.13% were degraded by strains SL1, SL4 and SL6 after 30 days of incubation, with rates of degradation of 0.127, 0.121 and 0.124 mg kg−1 h−1, respectively. This study successfully established the survivability (> 106 cfu/g detected after 30 days) and carbazole-degrading ability of these bacterial strains in soil, and highlights the potential of these isolates as seed for the bioremediation of carbazole-impacted environments.

Uncommon pathogen: Serious manifestation: A rare case of Achromobacter xylosoxidans septic arthritis in immunocompetetant patient.

Achromobacter xylosoxidans is a rare opportunistic Gram-negative bacilli and rarer etiology of septic arthritis. We present here the fi rst Indian case of septic arthritis due to A. xylosoxidans in 11-month-old male child confi rmed by 16S rRNA sequencing. The child was admitted as suspected case of septic arthritis and underwent arthrotomy. Drained pus revealed Gram-negative bacilli, identifi ed as Serratia odorifera by API (bioMérieux, Marcy l’Étoile, France), later subjected to VITEK 2 (bioMérieux, Marcy l’Étoile, France) identifi cation revealing it to be A. xylosoxidans. It being a rare etiology of septic arthritis confi rmation was done with 16S rRNA Sequencing.

Characterization of two Achromobacter xylosoxidans isolates from patients with pertussis-like symptoms

OBJECTIVE@#To characterize two Achromobacter xylosoxidans recovered from 2 patients diagnosed with pertussis during a Bordetella pertussis surveillance program.@*METHODS@#Nasopharyngeal swabs from 2 children under 1 year of age with clinical suspicion of pertussis were analyzed by culture and PCR.@*RESULTS@#Two Achromobacter xylosoxidans A8, closely related to Bordetella spp. were recovered from 2 patients diagnosed of pertussis, both carrying the ptxA gene and IS418 the pertussis toxin encoding gene. Subsequently, antibiotic susceptibility was evaluated by disk-diffusion method and by PCR.@*CONCLUSIONS@#Although more detailed studies are needed, the present data highlight the possibility that Achromobacter xylosoxidans, closely related Bordetella pertusssis microorganisms and not covered under the vaccine umbrella, might also result in cases of whooping cough. Thereby further surveillance is necessary to determine the extension and relevance of their pathogenic role in order to discriminate their real public health implication.

Characterization of two Achromobacter xylosoxidans isolates from patients with pertussis-like symptoms

Objective: To characterize two Achromobacter xylosoxidans recovered from 2 patients diagnosed with pertussis during a Bordetella pertussis surveillance program. Methods: Nasopharyngeal swabs from 2 children under 1 year of age with clinical suspicion of pertussis were analyzed by culture and PCR. Results: Two Achromobacter xylosoxidans A8, closely related to Bordetella spp. were recovered from 2 patients diagnosed of pertussis, both carrying the ptxA gene and IS418 the pertussis toxin encoding gene. Subsequently, antibiotic susceptibility was evaluated by disk-diffusion method and by PCR. Conclusions: Although more detailed studies are needed, the present data highlight the possibility that Achromobacter xylosoxidans, closely related Bordetella pertusssis microorganisms and not covered under the vaccine umbrella, might also result in cases of whooping cough. Thereby further surveillance is necessary to determine the extension and relevance of their pathogenic role in order to discriminate their real public health implication.