ABSTRACT
Infection prevention and control(hereinafter referred to as " infection control" )practitioners are the backbone of infection control teams of individual departments. Their capacity-building is key to improving the management efficiency at both hospital and department levels, which can effectively ensure medical safety. Since 2017, a tertiary traditional Chinese medicine hospital had scored desirable results based on the analysis of the problems existing in their capacity-building. In its explorations, the hospital attempted to improve the professional competency and management ability by the following measures. These measures included improving and standardizing the organization and management, establishing an on-the-job training system, formulating an annual management manual of department′s infection control teams, implementing a cross inspection system and patrol system of the practitioners during an epidemic, establishing an assessment and evaluation system and incentive mechanism, establishing infection control elite teams, and building a mode dominated by infection control doctors. These experiences can provide reference for optimizing the capacity building of the infection control practitioners.
ABSTRACT
Objective:To observe the antibacterial effect of Ag +-loaded TiO 2 (Ag -TiO 2) and Ag -TiO 2 coated endotracheal tube (ETT) on the bacterial biofilm (BF) of Staphylococcus aureus. Methods:2, 3-bis-(2-methoxy- 4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide (XTT) colorimetric method was used to detect minimal inhibitory concertation (MIC) of Ag-TiO 2 for inhibition of BF of Staphylococcus aureus. The Ag -TiO 2 coated ETT were prepared, and divided into 11 mg/L, 8 mg/L, 5 mg/L, 2 mg/L and 0 mg/L ETT group, according to the concentration gradient, then impregnated in the liquid with Staphylococcus aureus at a concentration of 1.0×10 9cfu/L. The influence of antibacterial coated ETT on the formation of Staphylococcus aureus BF was determined by detecting the colonies of bacteria and BF on the ETT. Results:Ag-TiO 2 had a significant inhibitory effect on Staphylococcus aureus BF in a concentration -dependent manner, and its MIC was 10 mg/L. Ag -TiO 2 coated ETT has significant anti -Staphylococcus aureus BF effect, and the higher the concentration, the stronger the effect. The absorbance ( A) values of Ag -TiO 2 5 mg/L, 8 mg/L, 11 mg/L ETT groups were significantly lower than that in control group (0.176±0.004, 0.147±0.002, 0.094±0.002 vs. 0.267±0.045, all P < 0.05). The inhibitory rates of Ag -TiO 2 2 mg/L, 5 mg/L, 8 mg/L ETT groups were increased gradually, and 11 mg/L Ag -TiO 2 coated ETT group had the highest inhibitory rate for BF, the inhibitory rates were 6.4%, 34.1%, 44.9% and 64.8%, respectively. Conclusion:Both Ag-TiO 2 and Ag-TiO 2 coated ETT have significant inhibitory effects on Staphylococcus aureus BF.
ABSTRACT
Abundant clinical and basic studies in recent years reported the high association of Wnt/β-catenin signaling pathway with the incidence and development of multiple neurological disorders. In order to improve the attention about the relationship between Wnt/β-catenin signaling pathway and neurological disorders, and to provide new therapy target, this article reviews the research progress on the relationship between wnt/β-catenin signaling pathway and Parkinson′s disease, Alzheimer′s disease, epilepsy, multiple sclerosis and myasthenia gravis.
ABSTRACT
Objective To study the effects of nano silver (Ag) and titanium dioxide (TiO2) on the content of nucleic acid in staphylococcus aureus in order to explore their antibacterial mechanisms.Methods After preparation of beef extract peptone liquid cultures,the effects of minimal inhibitory concentrations (MICs) of nano Ag and TiO2 on staphylococcus aureus strains were determined.With the 1/2 MICs nano Ag and TiO2,the contents of DNA and RNA macromolecules from staphylococcus aureus cultures were measured to determine the damage degree of staphylococcus aureus cell membranes by ultraviolet spectrophotometer,and then the fluorescence intensities of the staphylococcus aureus cells were observed under fluorescence microscope and the fluorescence values were tested by fluorescence spectrophotometer to determine the contents of nucleic acid DNA and RNA.Results The MICs of nano Ag and TiO2 were 1.6 mg/mL and 5.781 μg/mL.After treatment with the 1/2 MICs nano Ag and TiO2,nano Ag group and TiO2 group were compared with the control group (culture fluid without adding antibacterial agent),respectively,and there were no significant differences in the contents of DNA and RNA macromolecules from staphylococcus aureus cultures between n anoAg group and control group as well as between TiO2 group and control group were (P＞0.05),and there were significant decreases in fluorescence intensities and the contents of nucleic acid DNA and RNA (P＜0.01).Conclusions Nano Ag and TiO2 had obvious antibacterial effects on staphylococcus aureus and the antibacterial properties of nano Ag was stronger than that of TiO2.The antibacterial mechanisms of nano Ag and TiO2 against staphylococcus aureus may be associated with the inhibition of the synthesis of nucleic acid DNA and RNA,inhibiting protein synthesis and then bacterial growth.
ABSTRACT
Objective To study the antibacterial property of silver loaded titanium dioxide (TiO2) antibacterial coated endotracheal intubation tube,and to determine the minimum effective antibacterial concentration.Methods Intubation tubes coated with different concentrations of antibacterial agents were prepared with sol gel method.Polyethylene endotracheal intubation tubes were used as substrate,and silver loaded TiO2 was used as the antibacterial agent.According to the different antibacterial concentrations of the antibacterial agent,the tubes were divided into nine groups:10.0％ group,5.0％ group,2.0％ group,1.5％ group,1.0％ group,0.8％ group,0.6％ group,0.2％ group,and conrol group.They were respectively immersed in three standard bacteria suspensions with 1.0 × l05 cfu/mL:Pseudomonas aeruginosa,Staphylococcus aureus,and Escherichia coll Together with standard bacteria liquid group,there were 10 experimental groups.They were kept overnight for 24 hours.10 μL of respective culture medium was smeared on blood agar culture medium.After being cultured overnight in 35 ℃,the number of bacteria colonies was respectively counted.Results In 1.0 × 105 cfu/mL of three standard bacteria liquids with antibacterial agent concentration≥ 1.0％,three bacterial colonies had un-obviously growth rate.Almost the same strong antibacterial effects to achieve sterilizing rates of more than 98％ was shown in each group of the antibacterial coating endotracheal intubation tubes (all P＞0.05).As the antibacterial agent concentration decreased,three bacterial colonies were increasing gradually.Intermediate antibacterial effects were shown in tubes of 0.8％ group,with significant statistic difference as compared with 1.0％ and 0.6％ groups [Pseudomonas aeruginosa:7.300 (4.050,8.350) vs.0.200 (0.050,1.200),9.700 (9.000,10.000); Staphylococcus aureus:4.100 (3.300,4.650) vs.0.000 (0.000,0.150),5.800 (5.350,7.650); Escherichia coli:1.400 (0.750,3.750) vs.0.050 (0.025,0.050),9.500 (8.500,9.800),all P＜0.01].Conclusions Silver loaded TiO2 antibacterial coated endotracheal intubation tube had definite antibacterial properties,which were related to the antibacterial concentration.Strong antibacterial effects were shown when antibacterial concentration was above 1.0％,with bacteria almost completely killed in the immersing liquid.
ABSTRACT
Objective To analyze the bacterial distribution and resistance of clinical isolates from exacerbation of COPD patients in C and D classification in our emergency department.Methods The sputums were taken to culture and antimicrobial susceptibility test.VITEK-2 compact automicrobe system was used to identify bacteria.Disc diffusion test was used to determine the antimicrobial resistance.Results Of 222 clinical isolates,27.0％ were Gram positive bacteria,73.0％ were Gram negative bacteria.The Gram positive bacteria mainly was Staphylococcus aureus and Streptococcus pneumoniae.The detection rates of methicillin-resistant Staphylococcus aureus (MRSA) were 50.00％.The MRSA were more resistant than methicillin-sensitive Staphylococcus aureus (MSSA),and they were all sensitive to vancomycin,linezolid or tigecycline.The Gram negative bacteria mainly was Pseudomonas aeruginosa,Escherichia coli,Klebsiella spp and Acinetobacter baumannii.Pseudomonas aeruginosa and Acinetobacter baumannii had high resistant rates.The extended spectrum β-lactamases (ESBLs) producing strains in Escherichia coli were higher than in Klebsiella spp,which had multiple drug resistance.Conclusions The bacterial resistance situation is very severely in exacerbation of COPD patients in C and D classification in our emergency department.The first isolating rate was Pseudomonas aeruginosa.Surveillance of bacterial resistance is very important and effective control measures to reduce resistance is very necessary.
ABSTRACT
ObjectiveTo study the effects of Tanreqing injectio (a Chinese herb preparation acts as an anti-inflammatory agent to eliminate the pulmonary infection) on inflammatory cytokines of rats with acute lung injury (ALI). MethodsFifty-six clean grade healthy male SD rats were randomly (random number) divided into three groups: normal group, model group and treatment group. Rats in the model group and treatment group were injected with lipopolysaccharide (LPS) into tail vein. Rats in treatment group were treated with Tanreqing injection one hour after LPS injection. The observing intervals were respectively set in 2 h, 4 h and 6 h. At each observing interval, TNF-α, IL-1 β and IL-8 in brochoalveolar lavage fluid (BALF) were detected by radioimmunoassay, and the ratio of polymorphonuclear neutrophiles (ωPMN) in BALF were calculated by Wright-Giermsa staining, as well as to observe the pathological changes of lungs and to examine the lung wet/dry weight ratio (W/D). Data were analyzed with SPSS version 17.0 software. ResultsAt 2, 4 and 6 h intervals, TNF-α, IL-1β, IL-8 and ωPMN in BALF were significantly higher in model group than those in normal group (P ＜0. 05 or P ＜0. 01 ), the lung W/D in model group were obviously higher than those in normal group ( P ＜ 0. 01 ), and the pathological injury of lung tissue in model group were severe. At each observing interval, compared with model group,TNF-o, IL-1 β, IL-8 and oPMN in BALF were significantly reduced in treatment group ( P ＜ 0. 05 or P ＜0.01 ), the lung W/D in treatment group were obviously decreased ( P ＜0.01 ), and the lung injury were attenuated in treatment group. ConclusionsTanreqing injection could provide partly protection in rats with ALI by inhibiting inflammatory factor.