Objective To identify the novel species ‘Mycobacterium fukienense＇ sp. nov of Mycobacterium chelonoe/abscessus complex from tuberculosis patients in Fujian Province, China. Methods Five of 27 clinical Mycobucterium ...Objective To identify the novel species ‘Mycobacterium fukienense＇ sp. nov of Mycobacterium chelonoe/abscessus complex from tuberculosis patients in Fujian Province, China. Methods Five of 27 clinical Mycobucterium isolates （CIs） were previously identified as M. chelonoe/obscessus complex by sequencing the hsp65, rpoB, 165-235 rRNA internal transcribed spacer region （its）, recA and sodA house-keeping genes commonly used to describe the molecular characteristics of Mycobocterium. Clinical Mycobecterium isolates were classified according to the gene sequence using a clustering analysis program. Sequence similarity within clusters and diversity between clusters were analyzed. Results The 5 isolates were identified with distinct sequences exhibiting 99.8% homology in the hsp65 gene. However, a complete lack of homology was observed among the sequences of the rpoB, 165-235 rRNA internal tronscribed spacer region （its）, sodA, and recA genes as compared with the M. obscessus. Furthermore, no match for rpoB, sodA, and recA genes was identified among the published sequences. Conclusion The novel species, Mycobacterium fukienense, is identified from tuberculosis patients in Fujian Province, China, which does not belong to any existing subspecies of M. cheloneo/abscessus complex.展开更多
Objective To gain greater insight into the prevalence drug resistant profiles of M. abscessus from a general hospital in Beijing, China. Methods Partial gene sequencing of 16 S, hsp65, and rpo B were used to distingui...Objective To gain greater insight into the prevalence drug resistant profiles of M. abscessus from a general hospital in Beijing, China. Methods Partial gene sequencing of 16 S, hsp65, and rpo B were used to distinguish the species of NTM isolates. All strains identified as M. abscessus were further enrolled in the drug susceptibility testing by using broth microdilution method. Results We found that M. avium complex was the most frequent NTM organism, accounting for 54.1%（33/61） of all isolates. Behind MAC, the second most common organisms were M. abscessus（22 out of 61, 36.1%）. Average rates of resistance were 4.5% for AMK, 9.1% for LZD, and 13.6% for CLA, respectively. In contrast, resistance to LEV（17/22, 77.3%）, IMI（9/22, 40.9%）, and SMX（10/22, 45.5%） was noted in more than 40% of M. abscessus isolates. DNA sequencing revealed that all the CLA-resistant isolates harbored nucleotide substitutions in position 2058（1/3, 33.3%） or 2059（2/3, 66.7%） of 23 S r RNA. Conclusion In conclusion, our data demonstrated that M. intracellulare and M. abscessus were the most common NTM species in the general hospital of Beijing. CLA, AMK, LZD showed promising activity, where as LEV, IMI, and SMX exhibited poor activity against M. abscessus in vitro.展开更多
Objective To determine the susceptibilities of M. tuberculosis H37Ra and M. chelonei subsp. absecessus to several frequently-used disinfectants and to evaluate the practicability of surrogating M. tuberculosis by the ...Objective To determine the susceptibilities of M. tuberculosis H37Ra and M. chelonei subsp. absecessus to several frequently-used disinfectants and to evaluate the practicability of surrogating M. tuberculosis by the latter. Methods A suspension quantitative bactericidal test was set up in accordance with Chinese Technique Standard for Disinfection to evaluate the susceptibility of each mycobacteria strain to each selected disinfectant. Killing log value was used as criterion in comparing the susceptibility to disinfectants between the two strains. Results M. chelonei subsp. abscessus was more resistant to chlorine disinfectant than M. tuberculosis while the two strains were similarly resistant to iodophor disinfectant, peracetic acid, alcohol and glutaraldehyde disinfectant. Conclusion M. chelonei subsp. abscessus has the potential to surrogate M. tuberculosis in evaluating mycobactericidal efficacies of disinfectants.展开更多
Objective Moxifloxacin(MFX)shows good in vitro activity against Mycobacterium abscessus and can be a possible antibiotic therapy to treat M.abscessus infection;however,other studies have shown a lower or no activity.W...Objective Moxifloxacin(MFX)shows good in vitro activity against Mycobacterium abscessus and can be a possible antibiotic therapy to treat M.abscessus infection;however,other studies have shown a lower or no activity.We aimed to evaluate MFX activity against M.abscessus using zebrafish(ZF)model in vivo.Methods A formulation of M.abscessus labeled with CM-Dil was micro-injected into ZF.Survival curves were determined by recording dead ZF every day.ZF were lysed,and colony-forming units(CFUs)were enumerated.Bacteria dissemination and fluorescence intensity in ZF were analyzed.Inhibition rates of MFX and azithromycin(AZM,positive control)were determined and compared.Results Significantly increased survival rate was observed with different AZM concentrations.However,increasing MFX concentration did not result in a significant decrease in ZF survival curve.No significant differences in bacterial burdens by CFU loads were observed between AZM and MFX groups at various concentrations.Bacterial fluorescence intensity in ZF was significantly correlated with AZM concentration.However,with increasing MFX concentration,fluorescence intensity decreased slightly when observed under fluorescence microscope.Transferring rates at various concentrations were comparable between the MFX and AZM groups,with no significant difference.Conclusion MFX showed limited efficacy against M.abscessus in vivo using ZF model.Its activity in vivo needs to be confirmed.展开更多
BACKGROUND The incidence of infection with Mycobacterium abscessus(M.abscessus)has increased in recent years.This increase is partly associated with invasive cosmetic procedures.CASE SUMMARY The purpose of this case s...BACKGROUND The incidence of infection with Mycobacterium abscessus(M.abscessus)has increased in recent years.This increase is partly associated with invasive cosmetic procedures.CASE SUMMARY The purpose of this case summary is to increase clinicians'awareness of M.abscessus infection and reduce mycobacterial infection caused by cosmetic procedures.We report the case of a 45-year-old woman who received acetyl hexapeptide-8(argireline)injections in the forehead and temples,and erythema,nodules,and abscesses appeared at the injection sites after one week.The pus specimens were examined by microbiological culture and confirmed to be positive for M.abscessus.Clarithromycin 500 mg twice daily and moxifloxacin 400 mg once daily were administered for 5 mo and the lesions gradually subsided.CONCLUSION We report here for the first time a case of infection with M.abscessus after argireline injection.This condition is easily misdiagnosed as a common bacterial infection.Microbiological examinations are helpful for diagnosis and standardized cosmetic procedures can prevent infection with M.abscessus.展开更多
The proportion of non-tuberculous mycobacteria to Mycobacterium tuberculosis cultivated in the laboratory has been recently increasing. Numerous skin and soft tissue infections have been reported, while osteomyelitis ...The proportion of non-tuberculous mycobacteria to Mycobacterium tuberculosis cultivated in the laboratory has been recently increasing. Numerous skin and soft tissue infections have been reported, while osteomyelitis is reported very rarely. A delayed diagnosis can cause a wide range of bone destruction and joint contracture, which highlights the importance of early recognition of osteomyelitis. Here we report a case of ankle osteomyelitis caused by Mycobacterium abscessus and treatment failure due to delayed diagnosis.展开更多
BACKGROUND Mycobacterium abscessus(M.abscessus)is a rapidly growing mycobacterium and ubiquitous in the environment,which infrequently causes disease in humans.However,it can cause cutaneous or respiratory infections ...BACKGROUND Mycobacterium abscessus(M.abscessus)is a rapidly growing mycobacterium and ubiquitous in the environment,which infrequently causes disease in humans.However,it can cause cutaneous or respiratory infections among immunocompromised hosts.Due to the resistance to most antibiotics,the pathogen is formidable and difficult-to-treat.CASE SUMMARY Here,we present a case of catheter-related M.abscessus infections in a patient with motor neurone disease.Catheter and peripheral blood cultures of the patient showed positive results during Gram staining and acid-fast staining.The alarm time of catheter blood culture was 10.6 h earlier than that of peripheral blood.After removal of the peripherally inserted central catheter,secretion and catheter blood culture were positive.M.abscessus was identified by matrix-assisted laser desorption ionization-time of flight mass spectrometry and 16S rDNA sequencing.CONCLUSION For catheter-related M.abscessus infection,rapid diagnosis and timely and adequate antimicrobial therapy are crucial.展开更多
Mycobacterium abscessus,one of the most antimicrobial-resistant bacteria,is increasingly recognized as the cause of infections that are difficult to treat.Novel genetic manipulation tools are required to elucidate the...Mycobacterium abscessus,one of the most antimicrobial-resistant bacteria,is increasingly recognized as the cause of infections that are difficult to treat.Novel genetic manipulation tools are required to elucidate the biology,pathogenesis,and antibiotic resistance mechanisms of M.abscessus.In this study,we modified the method used to prepare M.abscessus electrocompetent cells to achieve efficient transformation,and then optimized the CRISPR-Cas9-assisted genome-editing tools to allow efficient genetic manipulation.Using these tools,we constructed 66 efflux pump mutants of M.abscessus and investigated their roles in drug resistance and virulence.We found that different efflux pumps play distinct roles in drug resistance and survival in Galleria mellonella larvae.Finally,we confirmed that MAB_2806-2807,involved in transportation of triacylglycerides,is vital for the drug resistance and virulence of M.abscessus.The molecular biology tools developed in this study will facilitate molecular research on M.abscessus.In addition,the study on efflux pumps might provide new targets for the development of new drugs and treatment regimens for M.abscessus infection.展开更多
目的了解河南省脓肿分枝杆菌复合群耐药情况及基因分型结果,为脓肿分枝杆菌复合群感染防控提供支持。方法收集河南省2019—2022年分离自各地市结核病定点防治机构送检标本32株脓肿分枝杆菌复合群菌菌株。使用微孔板法检测脓肿分枝杆菌...目的了解河南省脓肿分枝杆菌复合群耐药情况及基因分型结果,为脓肿分枝杆菌复合群感染防控提供支持。方法收集河南省2019—2022年分离自各地市结核病定点防治机构送检标本32株脓肿分枝杆菌复合群菌菌株。使用微孔板法检测脓肿分枝杆菌复合群菌对12种药物的敏感性,采用熔解曲线法和基因测序检测菌株耐药相关基因突变情况。用18位点可变数目串联重复序列(variable-number tandem repeat,VNTR)方法进行基因分型,并用BioNumerics软件对分型数据进行聚类分析。结果经鉴定32株菌株包括18株脓肿分枝杆菌、13株马赛分枝杆菌和1株博莱分枝杆菌。药敏结果显示,阿米卡星、克拉霉素、替加环素、利奈唑胺和头孢西丁等药物在体外对脓肿分枝杆菌复合群有较好的抗菌效果,耐药率分别为6.25%(2/32)、15.63%(5/32)、15.63%(5/32)、25.00%(8/32)和25.00%(8/32)。菌株对甲氧苄啶/磺胺甲恶唑、环丙沙星、美罗培南、多西环素、妥布霉素、亚胺培南和莫西沙星的耐药率较高,分别为87.50%(28/32)、81.25%(26/32)、81.25%(26/32)、78.13%(25/32)、65.63%(21/32)、65.63%(21/32)和59.38%(19/32)。脓肿分枝杆菌对头孢西丁和14 d时克拉霉素的耐药率高于马赛分枝杆菌,差异有统计学意义(P<0.05)。18位点VNTR将32株脓肿分枝杆菌复合群菌株分为28个不同的基因型,包括来自3个簇的7株菌株和25个独特模式的分离株,HunterGaston判别指数为0.990。结论河南省脓肿分枝杆菌复合群主要由脓肿分枝杆菌和马赛分枝杆菌组成,阿米卡星、克拉霉素、替加环素、利奈唑胺和头孢西丁等药物在体外对河南省分离的脓肿分枝杆菌复合群菌株具有较好的抗菌活性,18位点的VNTR分型方法对脓肿分枝杆菌复合群菌株具有较好的分型能力。展开更多
基金supported by the National Key Programme of Mega Infectious Diseases (2008ZX100/03-010-02)the National Natural Science Funding of China (30800029)
文摘Objective To identify the novel species ‘Mycobacterium fukienense＇ sp. nov of Mycobacterium chelonoe/abscessus complex from tuberculosis patients in Fujian Province, China. Methods Five of 27 clinical Mycobucterium isolates （CIs） were previously identified as M. chelonoe/obscessus complex by sequencing the hsp65, rpoB, 165-235 rRNA internal transcribed spacer region （its）, recA and sodA house-keeping genes commonly used to describe the molecular characteristics of Mycobocterium. Clinical Mycobecterium isolates were classified according to the gene sequence using a clustering analysis program. Sequence similarity within clusters and diversity between clusters were analyzed. Results The 5 isolates were identified with distinct sequences exhibiting 99.8% homology in the hsp65 gene. However, a complete lack of homology was observed among the sequences of the rpoB, 165-235 rRNA internal tronscribed spacer region （its）, sodA, and recA genes as compared with the M. obscessus. Furthermore, no match for rpoB, sodA, and recA genes was identified among the published sequences. Conclusion The novel species, Mycobacterium fukienense, is identified from tuberculosis patients in Fujian Province, China, which does not belong to any existing subspecies of M. cheloneo/abscessus complex.
基金supported by the grant 2012BAI05B02 from National Key Technology Research and Development ProgramChina and grant 81400037 from the National Natural Science Foundation of China
文摘Objective To gain greater insight into the prevalence drug resistant profiles of M. abscessus from a general hospital in Beijing, China. Methods Partial gene sequencing of 16 S, hsp65, and rpo B were used to distinguish the species of NTM isolates. All strains identified as M. abscessus were further enrolled in the drug susceptibility testing by using broth microdilution method. Results We found that M. avium complex was the most frequent NTM organism, accounting for 54.1%（33/61） of all isolates. Behind MAC, the second most common organisms were M. abscessus（22 out of 61, 36.1%）. Average rates of resistance were 4.5% for AMK, 9.1% for LZD, and 13.6% for CLA, respectively. In contrast, resistance to LEV（17/22, 77.3%）, IMI（9/22, 40.9%）, and SMX（10/22, 45.5%） was noted in more than 40% of M. abscessus isolates. DNA sequencing revealed that all the CLA-resistant isolates harbored nucleotide substitutions in position 2058（1/3, 33.3%） or 2059（2/3, 66.7%） of 23 S r RNA. Conclusion In conclusion, our data demonstrated that M. intracellulare and M. abscessus were the most common NTM species in the general hospital of Beijing. CLA, AMK, LZD showed promising activity, where as LEV, IMI, and SMX exhibited poor activity against M. abscessus in vitro.
文摘Objective To determine the susceptibilities of M. tuberculosis H37Ra and M. chelonei subsp. absecessus to several frequently-used disinfectants and to evaluate the practicability of surrogating M. tuberculosis by the latter. Methods A suspension quantitative bactericidal test was set up in accordance with Chinese Technique Standard for Disinfection to evaluate the susceptibility of each mycobacteria strain to each selected disinfectant. Killing log value was used as criterion in comparing the susceptibility to disinfectants between the two strains. Results M. chelonei subsp. abscessus was more resistant to chlorine disinfectant than M. tuberculosis while the two strains were similarly resistant to iodophor disinfectant, peracetic acid, alcohol and glutaraldehyde disinfectant. Conclusion M. chelonei subsp. abscessus has the potential to surrogate M. tuberculosis in evaluating mycobactericidal efficacies of disinfectants.
基金supported by Beijing Hospital Authority Youth Programme[QML20171602]Tongzhou District’s Two Supreme Talent[YH201911]+1 种基金Key Laboratory of Capital Medical University Open Research Project and Beijing Tuberculosis&Thoracic Tumor Research Institute Cultivation Project13th Five National Major Scientific and Technological Projects[2017ZX09304009]。
文摘Objective Moxifloxacin(MFX)shows good in vitro activity against Mycobacterium abscessus and can be a possible antibiotic therapy to treat M.abscessus infection;however,other studies have shown a lower or no activity.We aimed to evaluate MFX activity against M.abscessus using zebrafish(ZF)model in vivo.Methods A formulation of M.abscessus labeled with CM-Dil was micro-injected into ZF.Survival curves were determined by recording dead ZF every day.ZF were lysed,and colony-forming units(CFUs)were enumerated.Bacteria dissemination and fluorescence intensity in ZF were analyzed.Inhibition rates of MFX and azithromycin(AZM,positive control)were determined and compared.Results Significantly increased survival rate was observed with different AZM concentrations.However,increasing MFX concentration did not result in a significant decrease in ZF survival curve.No significant differences in bacterial burdens by CFU loads were observed between AZM and MFX groups at various concentrations.Bacterial fluorescence intensity in ZF was significantly correlated with AZM concentration.However,with increasing MFX concentration,fluorescence intensity decreased slightly when observed under fluorescence microscope.Transferring rates at various concentrations were comparable between the MFX and AZM groups,with no significant difference.Conclusion MFX showed limited efficacy against M.abscessus in vivo using ZF model.Its activity in vivo needs to be confirmed.
基金The Scientific Research Project of Peking University Shenzhen Hospital,No.JCYJ2018011the San-ming Project of Medicine in Shenzhen,No.SZSM201812059.
文摘BACKGROUND The incidence of infection with Mycobacterium abscessus(M.abscessus)has increased in recent years.This increase is partly associated with invasive cosmetic procedures.CASE SUMMARY The purpose of this case summary is to increase clinicians'awareness of M.abscessus infection and reduce mycobacterial infection caused by cosmetic procedures.We report the case of a 45-year-old woman who received acetyl hexapeptide-8(argireline)injections in the forehead and temples,and erythema,nodules,and abscesses appeared at the injection sites after one week.The pus specimens were examined by microbiological culture and confirmed to be positive for M.abscessus.Clarithromycin 500 mg twice daily and moxifloxacin 400 mg once daily were administered for 5 mo and the lesions gradually subsided.CONCLUSION We report here for the first time a case of infection with M.abscessus after argireline injection.This condition is easily misdiagnosed as a common bacterial infection.Microbiological examinations are helpful for diagnosis and standardized cosmetic procedures can prevent infection with M.abscessus.
文摘The proportion of non-tuberculous mycobacteria to Mycobacterium tuberculosis cultivated in the laboratory has been recently increasing. Numerous skin and soft tissue infections have been reported, while osteomyelitis is reported very rarely. A delayed diagnosis can cause a wide range of bone destruction and joint contracture, which highlights the importance of early recognition of osteomyelitis. Here we report a case of ankle osteomyelitis caused by Mycobacterium abscessus and treatment failure due to delayed diagnosis.
文摘BACKGROUND Mycobacterium abscessus(M.abscessus)is a rapidly growing mycobacterium and ubiquitous in the environment,which infrequently causes disease in humans.However,it can cause cutaneous or respiratory infections among immunocompromised hosts.Due to the resistance to most antibiotics,the pathogen is formidable and difficult-to-treat.CASE SUMMARY Here,we present a case of catheter-related M.abscessus infections in a patient with motor neurone disease.Catheter and peripheral blood cultures of the patient showed positive results during Gram staining and acid-fast staining.The alarm time of catheter blood culture was 10.6 h earlier than that of peripheral blood.After removal of the peripherally inserted central catheter,secretion and catheter blood culture were positive.M.abscessus was identified by matrix-assisted laser desorption ionization-time of flight mass spectrometry and 16S rDNA sequencing.CONCLUSION For catheter-related M.abscessus infection,rapid diagnosis and timely and adequate antimicrobial therapy are crucial.
基金supported by the National Key R&D Program of China(2022YFC2303200)the National Natural Science Foundation of China(32370199)+1 种基金the CAMS Initiative for Innovative Medicine(2021-I2M-1-035)the Beijing Jishuitan Research Funding(ZR-202520).
文摘Mycobacterium abscessus,one of the most antimicrobial-resistant bacteria,is increasingly recognized as the cause of infections that are difficult to treat.Novel genetic manipulation tools are required to elucidate the biology,pathogenesis,and antibiotic resistance mechanisms of M.abscessus.In this study,we modified the method used to prepare M.abscessus electrocompetent cells to achieve efficient transformation,and then optimized the CRISPR-Cas9-assisted genome-editing tools to allow efficient genetic manipulation.Using these tools,we constructed 66 efflux pump mutants of M.abscessus and investigated their roles in drug resistance and virulence.We found that different efflux pumps play distinct roles in drug resistance and survival in Galleria mellonella larvae.Finally,we confirmed that MAB_2806-2807,involved in transportation of triacylglycerides,is vital for the drug resistance and virulence of M.abscessus.The molecular biology tools developed in this study will facilitate molecular research on M.abscessus.In addition,the study on efflux pumps might provide new targets for the development of new drugs and treatment regimens for M.abscessus infection.
文摘目的了解河南省脓肿分枝杆菌复合群耐药情况及基因分型结果,为脓肿分枝杆菌复合群感染防控提供支持。方法收集河南省2019—2022年分离自各地市结核病定点防治机构送检标本32株脓肿分枝杆菌复合群菌菌株。使用微孔板法检测脓肿分枝杆菌复合群菌对12种药物的敏感性,采用熔解曲线法和基因测序检测菌株耐药相关基因突变情况。用18位点可变数目串联重复序列(variable-number tandem repeat,VNTR)方法进行基因分型,并用BioNumerics软件对分型数据进行聚类分析。结果经鉴定32株菌株包括18株脓肿分枝杆菌、13株马赛分枝杆菌和1株博莱分枝杆菌。药敏结果显示,阿米卡星、克拉霉素、替加环素、利奈唑胺和头孢西丁等药物在体外对脓肿分枝杆菌复合群有较好的抗菌效果,耐药率分别为6.25%(2/32)、15.63%(5/32)、15.63%(5/32)、25.00%(8/32)和25.00%(8/32)。菌株对甲氧苄啶/磺胺甲恶唑、环丙沙星、美罗培南、多西环素、妥布霉素、亚胺培南和莫西沙星的耐药率较高,分别为87.50%(28/32)、81.25%(26/32)、81.25%(26/32)、78.13%(25/32)、65.63%(21/32)、65.63%(21/32)和59.38%(19/32)。脓肿分枝杆菌对头孢西丁和14 d时克拉霉素的耐药率高于马赛分枝杆菌,差异有统计学意义(P<0.05)。18位点VNTR将32株脓肿分枝杆菌复合群菌株分为28个不同的基因型,包括来自3个簇的7株菌株和25个独特模式的分离株,HunterGaston判别指数为0.990。结论河南省脓肿分枝杆菌复合群主要由脓肿分枝杆菌和马赛分枝杆菌组成,阿米卡星、克拉霉素、替加环素、利奈唑胺和头孢西丁等药物在体外对河南省分离的脓肿分枝杆菌复合群菌株具有较好的抗菌活性,18位点的VNTR分型方法对脓肿分枝杆菌复合群菌株具有较好的分型能力。
