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Chinese Journal of Microbiology and Immunology ; (12): 258-264, 2022.
Article in Chinese | WPRIM | ID: wpr-934041


Objective:To identify a pathogenic strain JM-1 isolated from the pus of a patient stabbed by a sea shrimp and to analyze its antibiotic susceptibility and virulence genes, aiming to provide reference for screening clinically related infections caused by Cysteiniphilum litorale as a rare pathogen and improving prognosis. Methods:Biochemical phenotype identification, matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), 16S rRNA gene sequencing, analysis of average nucleotide identity (ANI) and average amino acid identity (AAI) based on the whole genome and phylogenetic analysis of the 16S rRNA gene and the whole genome were performed to accurately determine the taxonomic status of the strain JM-1. E-test was used to detect antibiotic susceptibility, and the results were interpreted according to the interpretation standards of Francisella tularensis in CLSI M45-A3. The virulence factor database (VFDB) was used for genome-wide annotation and analysis of virulence genes. Results:After culturing the strain JM-1 on the Columbia blood plate for 3 d, some grey-white, medium-sized, smooth, round and convex hemolytic colonies were observed. Gram staining result showed lightly colored Gram-negative Coccobacillus. API NH identification results suggested that the isolate JM-1 was Moraxella catarrhalis (biochemical code: 3010), while there was no identification result in Vitek2 system NH card (biochemical code: 0211002121). The EXS3000 mass spectrometer self-built database identified the isolate JM-1 as Cysteiniphilum litorale. The phylogenetic analysis based on the 16S rRNA gene and the whole genome showed that the isolate JM-1 and Cysteiniphilum litorale DSM 101832 T clustered into the same branch, and the ANI and AAI values between the two strains were 95.07% and 95.65%, respectively. The biochemical phenotype identification indicated the isolate JM-1 producing β-lactamase and penicillinase. Antibiotic susceptibility test results showed the strain was resistant to penicillin and sensitive to gentamicin, streptomycin, doxycycline, tetracycline, ciprofloxacin, levofloxacin, and chloramphenicol. Genome annotation suggested the virulence genes of the isolate JM-1 were similar to those of Francisella, including Francisella pathogenicity island (FPI), type Ⅳ fimbriae, capsule and lipopolysaccharide. Conclusions:Cysteiniphilum litorale was a rare pathogen with virulence genes similar to those of Francisella, and its antibiotic susceptibility was also similar to that of Francisella. This study confirmed a case of clinical infection caused by Cysteiniphilum litorale. The self-built MALDI-TOF MS system could be used for its rapid identification.

Chinese Journal of Infection and Chemotherapy ; (6): 42-47, 2019.
Article in Chinese | WPRIM | ID: wpr-744592


Objective To understand the etiology and clinical characteristics of candidemia, and the diagnostic value of(1, 3)-β-Dglucan. Methods This analysis included 31 patients with candidemia, 39 patients with Candida deep colonization, and 50 healthy subjects, who were enrolled from Wuyi Chinese Hospital Affiliated to Jinan University during the period from September 2015 to March 2018. Clinical data such as fungal culture, clinical features, and serum(1, 3)-β-D-glucan level were analyzed and compared between groups. Results Overall, 13 strains of Candida albicans and 18 strains of non-albicans Candida were isolated from the 31 patients with candidemia. The incidence of candidemia was associated with old age(>65 years), prior surgery(≤7 days), indwelling catheter(≥2 catheters and lasting ≥5 days), duration of mechanical ventilation(≥5 days)(P<0.05), but not associated with sex, underlying disease, prior use of anmicrobial and antifungal agents, immunosuppressant or glucocorticoid, or hypoproteinemia(P>0.05). Serum level of(1, 3)-β-D-glucan was significantly higher in candidemia patients than in the patients with candida deep colonization and healthy controls(P<0.05). The sensitivity and specificity of(1, 3)-β-D-glucan in diagnosing candidemia were 87.1% and 96.0%, respectively. The level of(1, 3)-β-D-glucan was significantly higher in candidemia with bacterial infection than candidemia without bacterial infection(P<0.05). The level of of(1, 3)-β-D-glucan was also significantly higher in the candidemia caused by Candida albicans alone than that caused by non-albicans Candida alone(P<0.05). Conclusions Non-albicans Candida is more prevalent than Candida albicans in candidiasis, but Candida albicans is still the most important Candida species. The incidence of candidemia is asociated with advanced age(>65 years), prior surgery within 7 days, indwelling catheters(≥2 catheters and lasting ≥5 days), and mechanical ventilation(≥5 days). Serum(1, 3)-β-D-glucan level is valuable for early diagnosis of candidemia.

International Journal of Laboratory Medicine ; (12): 2516-2518, 2015.
Article in Chinese | WPRIM | ID: wpr-482487


Objective To study the application value of T lymphocyte subsets and inflammatory factors in evaluating severity andprognosisofaplasticanemia.Methods 40patientswithaplasticanemiainthehospitalwereenrolledinthestudyasAAgroup, which was further divided into acute aplastic anemia(AAA) subgroup and chronic aplastic anemia(CAA) subgroup .In addition to that ,40 healthy people who received physical examination in the hospital during the same period were enrolled in the study as con‐trol group .Then blood routine tests were performed ,T lymphocyte subsets content in peripheral blood and serum inflammatory fac‐tor content were detected and the results were compared .Results Th1 ,Th17 contents and Th1/Th2 ,Th17/Treg ratio in AA group were higher than those in control group(P<0 .05) ,while Th2 ,Treg contents were lower(P<0 .05);Th1 ,Th17 contents and Th1/Th2 ,Th17/Treg ratio in AAA group were higher than those in CAA group(P<0 .05) ,while Th2 ,Treg cells contents were lower . Serum IL‐2 ,IFN‐γ ,IL‐17 contents in AA group were higher than those in control group(P<0 .05) ,while IL‐4 ,IL‐6 ,IL‐10 contents were lower(P<0 .05);serum IL‐2 ,IFN‐γ,IL‐17 contents in AAA group were higher than those of CAA group ,while IL‐4 ,IL‐6 , IL‐10 contents were lower .Hb ,PTL contents were negatively correlated with Th1 ,Th17 contents and serum IL‐2 ,IFN‐γ ,IL‐17 contents ,while positively correlated with Th2 ,Treg cells contents and serum IL‐4 ,IL‐6 ,IL‐10 contents .Conclusion Peripheral blood T lymphocyte subsets and serum inflammatory factors contents in aplastic anemia are abnormal and are correlated with the severity and prognosis related indicators .