ABSTRACT
ABSTRACT This work aimed to characterize 20 isolates obtained from upland rice plants, based on phenotypic (morphology, enzymatic activity, inorganic phosphate solubilization, carbon source use, antagonism), genotypic assays (16S rRNA sequencing) and plant growth promotion. Results showed a great morphological, metabolic and genetic variability among bacterial isolates. All isolates showed positive activity for catalase and protease enzymes and, 90% of the isolates showed positive activity for amylase, catalase and, nitrogenase. All isolates were able to metabolize sucrose and malic acid in contrast with mannitol, which was metabolized only by one isolate. For the other carbon sources, we observed a great variability in its use by the isolates. Most isolates showed antibiosis against Rhizoctonia solani (75%) and Sclerotinia sclerotiorum (55%) and, 50% of them showed antibiosis against both pathogens. Six isolates showed simultaneous ability of antibiosis, inorganic phosphate solubilization and protease activity. Based on phylogenetic analysis of the 16S rRNA gene all the isolates belong to Bacillus genus. Under greenhouse conditions, two isolates (S4 and S22) improved to about 24%, 25%, 30% and 31% the Total N, leaf area, shoot dry weight and root dry weight, respectively, of rice plants, indicating that they should be tested for this ability under field conditions.
Subject(s)
Bacteria/isolation & purification , Chryseobacterium/genetics , Oryza/growth & development , Soil Microbiology , Antibiosis , Bacterial Physiological Phenomena , Bacteria/classification , Bacteria/genetics , Base Composition , Base Sequence , Chryseobacterium/classification , Chryseobacterium/drug effects , Chryseobacterium/isolation & purification , DNA, Bacterial/genetics , Molecular Sequence Data , Oryza/microbiology , PhylogenyABSTRACT
ABSTRACT The type strain SUR2 of the novel species Chryseobacterium limigenitum was isolated from a dehydrated sludge of the municipal sewage treatment plant in Dogoše near Maribor in Slovenia. The draft genome, with 60 contigs, 4,697,725 bp, 34.4% of G+C content, was obtained using the Illumina HiSeq 2500-1 platform. Joint Genome Institute Microbial Genome Annotation Pipeline (MGAP v.4) has identified 4322 protein-coding sequences including resistance genes against arsenic and other heavy metals. In addition, a subclass B3 metallo-β-lactamase, which confers resistance to penicillins, cephalosporins and carbapenems, was also present in the genome. The genome sequence provides important information regarding bioremediation potential and pathogenic properties of this newly identified species.
Subject(s)
Sewage/microbiology , Genome, Bacterial , Chryseobacterium/genetics , Penicillins/pharmacology , Phylogeny , Sewage/chemistry , Base Composition , DNA, Bacterial/genetics , Molecular Sequence Data , Base Sequence , Microbial Sensitivity Tests , Carbapenems/pharmacology , Chryseobacterium/isolation & purification , Chryseobacterium/classification , Chryseobacterium/drug effects , Anti-Bacterial Agents/pharmacologyABSTRACT
Chryseobacterium meningosepticum is a gram negative rod widely distributed in nature. It is known to cause meningitis in neonates and premature infants. Adult infections are not common and are usually nosocomially acquired. We report an unusual case of native valve endocarditis in a 58-year-old man due to this organism. A high degree of suspicion and correct identification and sensitivity testing is required to diagnose infections by this rare isolate.
Subject(s)
Anti-Bacterial Agents/pharmacology , Chryseobacterium/drug effects , Endocarditis, Bacterial/diagnosis , Humans , India , Male , Microbial Sensitivity Tests , Middle AgedABSTRACT
Chryseobacterium meningosepticum is an uncommon pathogen causing meningitis. We report a case of adult meningitis caused by chryseobacterium meningosepticum in an 88 year old woman. Immunosuppression due to old age, diabetes mellitus and history of hypertension of 20 years duration were the concomitant factors. chryseobacterium meningosepticum was isolated both from the cerebrospinal fluid and blood cultures. This organism was sensitive to quinolones, rifampicin and resistant to many antibiotics commonly used for empiric therapy for meningitis.
Subject(s)
Aged , Aged, 80 and over , Chryseobacterium/drug effects , Drug Resistance, Bacterial , Fatal Outcome , Female , Flavobacteriaceae Infections/etiology , Humans , Meningitis, Bacterial/etiologyABSTRACT
BACKGROUND: Chryseobacterium species are Gram-negative bacteria with an unusual antibiotic profile. Chryseobacterium meningosepticum is the species most commonly encountered as a human pathogen. OBJECTIVES: To study the microbiological, clinical and therapeutic features of C. meningosepticum infections in patients on dialysis, at Sri Jayewardenepura General Hospital (Teaching) (SJGH), and to trace the source of infections. DESIGN: A retrospective descriptive study. SETTING: Dialysis unit of SJGH. PATIENT: population Patients who underwent long term haemodialysis (HD) and manual intermittent peritoneal dialysis (IPD) in the dialysis unit. METHODS: Clinical and microbiological records of patients with C. meningosepticum infections over a period of 2 years were reviewed retrospectively. Environmental screening was carried out to detect a possible source of infection. RESULTS: Thirty five episodes of infection due to C. meningosepticum in 33 patients on HD and IPD were detected. There were 30 episodes of peritonitis, four of bacteraemia and one of asymptomatic colonization of a PD catheter. Isolates were resistant to aminoglycosides, chephalosporins and aztreonam, and sensitive to cotrimoxazole, vancomycin and rifampicin. They showed variable sensitivity to imipenem and ciprofloxacin. All except one patient had a favourable outcome. C. meningosepticum was cultured from a sink in the dialysis unit, but the original source of the organism was not known. CONCLUSION: C. meningosepticum could be an important pathogen in a dialysis unit, and fluoroquinolones and vancomycin are effective as empiric therapy.