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Tan XH, Deng AP, Zhang YT, Luo M, Deng H, Yang YW, Duan JH, Peng ZQ, Zhang M. [Analysis of the impact of health management measures for entry personnel on imported Dengue fever in Guangdong Province, 2020-2022]. Zhonghua Liu Xing Bing Xue Za Zhi 2023; 44:954-959. [PMID: 37380419 DOI: 10.3760/cma.j.cn112338-20221021-00899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
Objective: To explore the impact of health management measures for entry personnel (entry management measures) against COVID-19 on the epidemiological characteristics of imported Dengue fever in Guangdong Province from 2020 to 2022. Methods: Data of imported Dengue fever from January 1, 2016 to August 31, 2022, mosquito density surveillance from 2016 to 2021, and international airline passengers and Dengue fever annual reported cases from 2011 to 2021 in Guangdong were collected. Comparative analysis was conducted to explore changes in the epidemic characteristics of imported Dengue fever before the implementation of entry management measures (from January 1, 2016 to March 20, 2020) and after the implementation (from March 21, 2020 to August 31, 2022). Results: From March 21, 2020, to August 31, 2022, a total of 52 cases of imported Dengue fever cases were reported, with an imported risk intensity of 0.12, which were lower than those before implementation of entry management measures (1 828, 5.29). No significant differences were found in the characteristics of imported cases before and after implementation of entry management measures, including seasonality, sex, age, career, and imported countries (all P>0.05). 59.62% (31/52) of cases were found at the centralized isolation sites and 38.46% (20/52) at the entry ports. However, before implementation of entry management measures, 95.08% (1 738/1 828) of cases were found in hospitals. Among 51 cases who had provided entry dates, 82.35% (42/51) and 98.04% (50/51) of cases were found within seven days and fourteen days after entry, slightly higher than before implementation [(72.69%(362/498) and 97.59% (486/498)]. There was significant difference between the monthly mean values of Aedes mosquito larval density (Bretto index) from 2020 to 2021 and those from 2016 to 2019 (Z=2.83, P=0.005). There is a strong positive correlation between the annual international airline passengers volume in Guangdong from 2011 to 2021 and the annual imported Dengue fever cases (r=0.94, P<0.001), and a positive correlation also existed between the international passenger volume and the annual indigenous Dengue fever cases (r=0.72, P=0.013). Conclusions: In Guangdong, the entry management measures of centralized isolation for fourteen days after entry from abroad had been implemented, and most imported Dengue fever cases were found within fourteen days after entry. The risk of local transmission caused by imported cases has reduced significantly.
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Affiliation(s)
- X H Tan
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - A P Deng
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Y T Zhang
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - M Luo
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - H Deng
- Institute of Disinfection and Vector Control, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Y W Yang
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - J H Duan
- Institute of Disinfection and Vector Control, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Z Q Peng
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - M Zhang
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
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Li SM, Zhou YF, Li L, Fang LX, Duan JH, Liu FR, Liang HQ, Wu YT, Gu WQ, Liao XP, Sun J, Xiong YQ, Liu YH. Characterization of the Multi-Drug Resistance Gene cfr in Methicillin-Resistant Staphylococcus aureus (MRSA) Strains Isolated From Animals and Humans in China. Front Microbiol 2018; 9:2925. [PMID: 30538695 PMCID: PMC6277690 DOI: 10.3389/fmicb.2018.02925] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 11/14/2018] [Indexed: 01/03/2023] Open
Abstract
We investigated cfr-positive and -negative MRSA strains isolated from animals and humans in different geographical areas of China, from 2011 to 2016. Twenty cfr-positive strains (15.6%) were identified from 128 MRSA strains including 17 from food animals and three from humans. The resistance rates and prevalence of the tested antibiotic resistance genes (ARGs) in the cfr-positive MRSA isolates were higher than that in the cfr-negative MRSA isolates. All cfr-positive MRSA isolates were co-carrying fexA and ermC, and had significantly higher optrA incidence rate vs. the cfr-negative isolates (P < 0.05). In addition, multilocus sequence typing (MLST) assays showed that ST9 and spa-type t899 were the most prevalent ST and spa types in the study strains. However, all of the 20 cfr-positive and 10 randomly selected cfr-negative MRSA isolates were clonally unrelated as determined by pulsed-field gel electrophoresis (PFGE) analyses. Importantly, the cfr gene was successfully transferred to a recipient Staphylococcus aureus strain RN4220 from 13 of the 20 cfr-positive MRSA isolates by electroporation. Among these 13 cfr-positive MRSA isolates, two different genetic contexts surrounding cfr were determined and each was associated with one type of cfr-carrying plasmids. Of note, the predominant genetic context of cfr was found to be a Tn558 variant and locate on large plasmids (∼50 kb) co-harboring fexA in 11 of the 13 MRSA isolates. Furthermore, the cfr gene was also identified on small plasmids (∼ 7.1 kb) that co-carried ermC in two of the 13 MRSA isolates. Our results demonstrated a high occurrence of multi-drug resistance in cfr-positive MRSA isolates, and the spread of cfr might be attributed to horizontal dissemination of similar cfr-carrying transposons and plasmids.
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Affiliation(s)
- Shu-Min Li
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yu-Feng Zhou
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,LABioMed at Harbor-UCLA Medical Center, Torrance, CA, United States
| | - Liang Li
- LABioMed at Harbor-UCLA Medical Center, Torrance, CA, United States
| | - Liang-Xing Fang
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jia-Hong Duan
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Fan-Rui Liu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Hua-Qing Liang
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yu-Ting Wu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Wei-Qi Gu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xiao-Ping Liao
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jian Sun
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yan-Qiong Xiong
- LABioMed at Harbor-UCLA Medical Center, Torrance, CA, United States.,Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Ya-Hong Liu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
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Fang LX, Duan JH, Chen MY, Deng H, Liang HQ, Xiong YQ, Sun J, Liu YH, Liao XP. Prevalence of cfr in Enterococcus faecalis strains isolated from swine farms in China: Predominated cfr-carrying pCPPF5-like plasmids conferring "non-linezolid resistance" phenotype. Infect Genet Evol 2018; 62:188-192. [PMID: 29679746 DOI: 10.1016/j.meegid.2018.04.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 03/23/2018] [Accepted: 04/18/2018] [Indexed: 01/27/2023]
Abstract
The cfr gene associated with linezolid resistance has attracted wide attention. However, little is known about its prevalence and mode of transmission in Enterococcus faecalis. In this study, we investigate the prevalence and genetic environment of the cfr gene in 91 E. faecalis isolates collected from swine faecal swabs in 30 farms in Guangdong Province, China in 2012. A relatively high prevalence of cfr was identified in E. faecalis isolates (11/91, 12.1%) by PCR. All the cfr-positive E. faecalis strains had a multidrug-resistance phenotype including erythrocin, tetracycline, gentamicin, kanamicin and ciprofloxacin, except vancomycin and linezolid. Molecular typing indicated that ST475 and ST16 were the most common types in cfr-positive E. faecalis strains. In addition, we demonstrated that all the cfr genes were located on plasmids by S1-PFGE and Southern blotting. A 12 kb cfr-positive plasmid (pE30) was identified in most (9/11) E. faecalis strains, but it couldn't mediate resistance to linezolid in the transconjugant. Sequence analysis showed that the pE30 was a pCPPF5-like plasmid and the region surrounding the cfr gene was the same as a cfr-carrying ISEnfa5-composite element in Streptococcus plasmid pStrcfr with 4 bp direct repeat (GTAT) on both sides. In conclusion, the cfr gene which had no linezolid resistance phenotype was present in multidrug-resistance E. faecalis strains, and the clonal spread of ST475 and ST16 strains and the horizontal transfer of the pCPPF5-like plasmids have contributed to the dissemination of cfr.
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Affiliation(s)
- Liang-Xing Fang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Jia-Hong Duan
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Mu-Ya Chen
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Hui Deng
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Hua-Qing Liang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Yan Q Xiong
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA; David Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | - Jian Sun
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Ya-Hong Liu
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China
| | - Xiao-Ping Liao
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development, and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China.
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Chen MY, Lira F, Liang HQ, Wu RT, Duan JH, Liao XP, Martínez JL, Liu YH, Sun J. Multilevel selection of bcrABDR-mediated bacitracin resistance in Enterococcus faecalis from chicken farms. Sci Rep 2016; 6:34895. [PMID: 27731342 PMCID: PMC5059624 DOI: 10.1038/srep34895] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 09/19/2016] [Indexed: 11/16/2022] Open
Abstract
In this study we isolated 109 Enterococcus faecalis from chicken faecal samples in 6 provinces of China to investigate the prevalence and transmission mechanism of the bacitracin resistance locus bcrABDR in E. faecalis. Thirty-seven bcrABDR-positive E. faecalis were detected with 26 different PFGE clusters. The MLST of 14 positive strains belonged to ST16 and we also detected three new sequence types. S1-PFGE analysis indicated that the locus was located on plasmids presenting different sizes, with the most prevalent size being ~50 kb (13/37). Sequence analysis revealed that 17 out of the 37 strains harbored a 5400-bp central region, in which locus bcrABDR was bracketed by two ISEnfa1 of the same orientation. Two types of bcrABDR alleles, differing in around 10% of their sequence were found. In silico analysis showed that bcrABDR is present in a variety of bacteria including the chicken commensal Enterococcus cecorum. Our results indicate that the use of bacitracin at farms might trigger the emergence and spread of the bacitracin resistance determinant bcrABDR among human bacterial pathogens. The finding of bcrABDR in the chicken commensal E. cecorum indicates that farm animals microbiota can be an important reservoir of resistance genes with relevance for human health.
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Affiliation(s)
- Mu-Ya Chen
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
| | - Felipe Lira
- Centro Nacional de Biotecnología, CSIC, Darwin 3, Madrid-28049, Spain
| | - Hua-Qing Liang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
| | - Rui-Ting Wu
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
| | - Jia-Hong Duan
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
| | - Xiao-Ping Liao
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
| | - José L Martínez
- Centro Nacional de Biotecnología, CSIC, Darwin 3, Madrid-28049, Spain
| | - Ya-Hong Liu
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
| | - Jian Sun
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, China
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Sun J, Yang RS, Zhang Q, Feng Y, Fang LX, Xia J, Li L, Lv XY, Duan JH, Liao XP, Liu YH. Co-transfer of bla NDM-5 and mcr-1 by an IncX3-X4 hybrid plasmid in Escherichia coli. Nat Microbiol 2016; 1:16176. [PMID: 27668643 DOI: 10.1038/nmicrobiol.2016.176] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 08/17/2016] [Indexed: 11/09/2022]
Abstract
Carbapenem and colistin are the last-resort antibiotics used for treating multidrug-resistant Gram-negative pathogens. Here, we report, for the first time, co-transfer of resistance to both classes of antibiotics by a mobile IncX3-X4 hybrid plasmid in an Escherichia coli isolate. Spread of such a plasmid is of great concern for clinical therapy, and heightened efforts are needed to control its dissemination.
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Affiliation(s)
- Jian Sun
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Run-Shi Yang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Qijing Zhang
- Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa 50011, USA
| | - Youjun Feng
- Department of Medical Microbiology and Parasitology, Zhejiang University School of Medicine, Zhejiang 310027, China
| | - Liang-Xing Fang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jing Xia
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Liang Li
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Xiao-Yue Lv
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jia-Hong Duan
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Xiao-Ping Liao
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Ya-Hong Liu
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou 510642, China.,College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.,Jiangsu Co-Innovation Centre for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu 225009, China
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Duan JH, Jiang Y, Mu H, Tang ZQ. Expression of BAFF and BR3 in patients with systemic lupus erythematosus. Braz J Med Biol Res 2016; 49:S0100-879X2016000300706. [PMID: 26840704 PMCID: PMC4763815 DOI: 10.1590/1414-431x20154853] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 09/29/2015] [Indexed: 12/18/2022] Open
Abstract
The objective of this study was to examine the relationship between the expression of B cell activating factor (BAFF) and BAFF receptor in patients with disease activity of systemic lupus erythematosus (SLE). Real-time RT-PCR was used to examine BAFF mRNA expression in peripheral blood monocytes of active and stable SLE patients and healthy controls. The percentage of BAFF receptor 3 (BR3) on B lymphocytes was measured by flow cytometry. Soluble BAFF levels in serum were assayed by ELISA. Microalbumin levels were assayed by an automatic immune analysis machine. BAFF mRNA and soluble BAFF levels were highest in the active SLE group, followed by the stable SLE group, and controls (P<0.01). The percentage of BR3 on B lymphocytes was downregulated in the active SLE group compared with the stable SLE group and controls (P<0.01). BAFF mRNA levels and soluble BAFF levels were higher in patients who were positive for proteinuria than in those who were negative (P<0.01). The percentage of BR3 on B lymphocytes was lower in patients who were positive for proteinuria than in those who were negative (P<0.01). The BAFF/BR3 axis may be over-activated in SLE patients. BAFF and BR3 levels may be useful parameters for evaluating treatment.
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Affiliation(s)
- J H Duan
- Tianjin First Central Hospital, Tianjin, China
| | - Y Jiang
- Tianjin First Central Hospital, Tianjin, China
| | - H Mu
- Tianjin First Central Hospital, Tianjin, China
| | - Z Q Tang
- Tianjin First Central Hospital, Tianjin, China
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Duan JH, Yang SG, Liu HW, Gong JF, Huang HB, Zhao XN, Zhang R, Du YW. Preparation and Characterization of Straight and Zigzag AlN Nanowires. J Phys Chem B 2005; 109:3701-3. [PMID: 16851410 DOI: 10.1021/jp044569o] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hexagonal single-crystal AlN nanowires with straight or zigzag morphologies were successfully synthesized by the reaction of aluminum alloy in an ammonia/nitrogen atmosphere at 1100 degrees C. It is found that the crystal tropism of the nanowires is along [0001], whereas the growth directions of the zigzag nanowires shift between [2111] and [2111].
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Zhang XL, Duan JH, Wang Y, Kuang MS, Huang FS. [Analysis of Pagumogonimus skrjabini antigen and its application in serodiagnosis]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 18:277-81. [PMID: 12567634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To analyse the soluble antigens of different developmental stages of Pagumogonimus skrjabini and develop a specific and sensitive serodiagnostic method for pagumogonimiasis. METHODS The soluble antigens of P. skrjabini of various stages were separated by SDS-PAGE. The specific antigen of the adult fluke was recognized immunologically by immunoblot assay. The protein bands between 10-30 kDa purified by SDS-PAGE and electrophoretic elution were used in dot-ELISA. RESULTS Using dot-ELISA, the soluble antigens of adult were recognized by sera infected with P. skrjabini. More reactive bands appeared at 10-30 kDa, but major protein bands were at 22, 24 and 26 kDa. However, using sera from patients infected with other trematodes including schistosome and Clonorchis, cross-reaction bands appeared within 60 to 90 kDa. When compared with ELISA of crude adult antigens for detecting 28 suspected patients, there was no significant difference between the two methods. The sera of 38 patients with other diseases were also detected by the two tests. No cross-reaction occurred with the purified adult antigen dot-ELISA while 13.2% (5/38) of the sera cross-reacted in ELISA of crude adult antigens. CONCLUSION Dot-ELISA using 10-30 kDa antigen might be a specific and sensitive serodiagnostic method for diagnoing pagumogonimiasis.
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Affiliation(s)
- X L Zhang
- Department of Parasitology, Third Military Medical University, Chongqing 400038
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Duan JH, Li ZX, Zhang KR, Luo HQ, Zeng XW, Zhang DR. [Observation on the persistence period and transmission of residual microfilaremia with medium and higher density]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 18:167-9. [PMID: 12567699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To explore the persistence period of medium and higher density of microfilaremia and its role in the transmission of filariasis in areas with filariasis basically eradicated. METHODS The residual microfilaremia was followed up and the population were regularly examined by thick blood film assay. Culex quinquefaciatus were dissected to determine the natural infection rate and density of filarial larvae. The filarial antibody levels were detected by using IFAT. RESULTS Two cases with medium and higher density of microfilaremia were found to be microfilaremia positive for twelve years. The natural infection rate and density of filarial larvae in Culex quinquefasciatus dropped down year by year, one case of new microfilaremia was found in the sixteenth year. CONCLUSION The persistence period of residual medium and higher density of microfilaremia lasted for more than twelve years. The individual residual medium and higher density of microfilaremia cases still possess the potential for transmission of filariasis.
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Shi CM, Huang FS, Kuang MS, Duan JH. [Relationship between hemolymph phenol oxidase and melanization of oocysts of Plasmodium yoelii in Anopheles stephensi]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 18:11-3. [PMID: 12567462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To explore the relationship between the hemolymph phenol oxidase and melanization of oocysts. METHODS Anopheles stephensi-Plasmodium yoelii system was used to determine the activity of monophenol oxidase (MPO) and o-diphenol oxidase (o-DPO) in the hemolymph collected from 4 groups of mosquitoes by polyacrylamide gel electrophoresis (PAGE) followed by density scanning. The 4 groups of mosquitoes were: non-blood-fed (N), normal-blood-fed (B), infected-blood-fed (I) and nitroquine-administrated (D), respectively. RESULTS No significant difference was found in the activities of MPO and o-DPO between groups N and B. The activities of MPO and o-DPO were not obviously modified in group I, but were significantly increased on day 10 and decreased on day 15 after blood feeding in the group D as compared with those in the groups N and B. CONCLUSION The alteration in the mosquito hemolymph PO activity coincided at each time point with the melanization of Plasmodium yoelii oocysts.
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Affiliation(s)
- C M Shi
- Department of Parasitology, Third Military Medical University, Chongqing 400038
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Bi ZQ, Bo YH, Duan JH. [Treatment of chronic renal failure with Oenothera beinnis L in rats with subtotal nephrectomy]. Zhonghua Nei Ke Za Zhi 1992; 31:7-10, 59. [PMID: 1395915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The effect of orally administered Oenothera Biennis L on chronic renal failure was studied in the partially nephrectomized rats. As compared with the control groups, the group treated with Oenothera showed the following features. 1) Urine protein excretion was reduced; 2) Level of serum cholesterol decreased; 3) Scr maintained the same level as before treatment; 4) Level of PGE1 and PGE2 increased both in renal cortex and medulla; 5) 6-keto PGF1 alpha increased in cortex; 6) Increased TXB2 production was only observed 4 weeks after nephrectomy; 7) Glomerular lesions were more severe in control group. It is concluded that Oenothera Biennis L has beneficial effect on the remnant kidney and may be useful as a kind of conservative treatment for chronic renal failure.
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Affiliation(s)
- Z Q Bi
- Nephrology Division, PUMC Hospital, Beijing
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12
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Cheng JX, Duan JH, Han FY, Wang ZG. [Radioimmunoassay for prostaglandin F2 alpha and its application]. Yao Xue Xue Bao 1988; 23:445-7. [PMID: 3213531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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13
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Cheng JX, Duan JH, Han FY, Ge L, Wang ZG, Shi YQ. [Radioimmunoassay of prostaglandin E2]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1987; 9:229-32. [PMID: 2958164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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14
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Shi YQ, Li ZJ, Ma KR, Cheng JX, Yan MF, Wang SR, Jiang ZJ, Duan JH, Wang ZG. [Radioimmunoassay of 6-keto-PGF1 alpha]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1986; 8:310-2. [PMID: 2953482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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15
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Cheng JX, Shi YQ, Ge L, Duan JH, Wang ZG. [Preparation of prostaglandin E(PGE) antibodies and its technical improvements]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1986; 8:111-6. [PMID: 2944638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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