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Objective@#To evaluate the efficacy of ultraviolet light in influenza B prevention and control in schools in Yantian District of Shenzhen in winter, and to provide a reference for preventing and controlling influenza B in schools.@*Methods@#Multistage stratified cluster sampling was conducted. Ultraviolet irradiance was detected in 98 classes of 11 schools. The irradiance of different distances under each ultraviolet lamp were measured. Correlational analysis was conducted with influenza cases reported by Shenzhen Student Health Surveillance System.@*Results@#A total of 473 ultraviolet lamps were detected, the qualified rate was 53.91%. The effective distance from the lamp corresponding power supply to efficient irradiance was (1.43±0.54)m. The total effective irradiance volume per unit time of each class was(13.65±32.66)m3. Totally 599 influenza cases in 74 classes were reported, with incidence rate of 13.76%. Fifty-eight classes reported influenza clustering, accounting for 59.18%. Average duration of the epidemic was(14.5±25.25)d. Spearman correlation analysis showed that the proportion of irradiance volume per unit time in classroom volume was negatively correlated with class influenza incidence(r=-0.32, P=0.00), but not significant with duration of influenza epidemic(P=0.78). Covariance analysis showed that the incidence of influenza and the duration of influenza epidemic in classes was not significantly correlated with the proportion of irradiance volume per class per unit time in classroom volume (P>0.05).@*Conclusion@#Ultraviolet light might not effectively reduce the incidence rate of influenza B and the duration of influenza epidemic in schools in Yantian District of Shenzhen over 2017-2018 winter.
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BACKGROUND: It is confirmed that pathogenicity of biomaterials-centered infection is positive correlated to bacterial biofilm formation of Staphylococcus epidermidis on the surface of catheter-related materials. OBJECTIVE: To analyze the relations between expressions of central venous catheter-related Staphylococcus epidermidis icaA, icaD, transforming growth factor β1 (TGF-β1) and formation of bacterial biofilm. METHODS: The type of Staphylococcus epidermidis in lung cancer cases with catheter-related bloodstream infections (CRBSI) was indentified, followed by bacterial genomic DNA extraction. The expression of biofilm formation-related genes icaA, icaD mRNA and phenotype of biofilm were detected by PCR. The serum TGF-β1 levels in cases with or without CRBSI were measured by enzyme-linked immunosorbent assay.RESULTS AND CONCLUSION: The expression of Staphylococcus epidermidis operon icaA and icaD gene was positive correlated to biofilm formation in lung cancer cases with CRBSI (P < 0.01); particularly, the TGF-β1 levels in CRBSI cases were greater than that of non-CRBSI cases (P < 0.05). The results demonstrated that, central venous catheter infection causes positive Staphylococcus epidermidis icaA and icaD gene expressions in lung cancer cases and is prone to form biofilm, high level of peripheral TGF-β1 may play a positive role in bacterial biofilm formation.
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BACKGROUND: High-concentration glucose can induce the formation of biofilms in Staphylococcus epidermidis.OBJECTIVE: To investigate the effect of high-concentration glucose on eliminating ability and adhesion of Staphylococcus epidermidis in Tupaia belangeri.METHODS: Tupaia belangeri models of hyperglycaemia (≥11.1 mmoL/L) were induced by intraperitoneal injection of Streptozocin. PVC catheters were inserted into the left femoral vein, and Staphylococcus epidermidis with or without formation of biofilms was inoculated into the catheters.RESULTS AND CONCLUSION: Following transfection of Staphylococcus epidermidis with formation of biofilms, there were higher rates of bacterial infection as well as higher bacterium colony number in the serum, heart, liver, kidney and pancreas of Tupai belangeri in hyperglycemia group (≥11.1 mmoL/L) as compared with the control group (P < 0.05). Detected by scanning electronic microscope, biofilm formation was remarkable in hyperglycemia group (≥11.1 mmoL/L) (P < 0.05). However, there was no formation of biofilms in hyperglycemia or control groups following transfection of Staphylococcus epidermidis without formation of biofilms. Hyperglycemia can induce the decreasing ability of eliminating bacteria and the increasing formation of biofilms on the surface of biomaterials transfected with Staphylococcus epidermidis.
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BACKGROUND: Permanent or transient implantation of biomaterials can result in biomaterials-centered infections (BCI) in lung cancer patients.OBJECTIVE: To investigate the relationship between BCI and peripheral blood transforming growth factor β1 (TGF-β1) in patients with lung cancer.METHODS: A total of 248 lung cancer patients undergoing in vivo intravascular catheter indwelling > 7 days were included.Quantitative method was used for intubation, bacteriological culture and paired blood culture, and API Staph strips were adopted for positive patients. While enzyme-linked immunosorbent assay was used to detect TGF-β1 levels in the peripheral blood of patients with lung cancer and 75 healthy volunteers as normal controls.RESULTS AND CONCLUSION: Among the 248 patients, there were 82 BCI-positive cases, and 166 BCI-negative cases.Thirteen patients were confirmed to have catheter-related bloodstream infection. There were 48 Gram-positive bacteria, 24Gram-negative bacilli, and 10 fungal. The levels of TGF-β1 were higher in BCI-positive patients than BCI-negative patients (P < 0.05); the levels of TGF-β1 in the BCI-negative group were higher than those in the normal control group (P < 0.05). For lung cancer patients with nosocomial infection induced BCI, there are various species of pathogenic bacteria, and Gram-positive bacteria are more common. To detect TGF-β1 levels in patients with lung cancer is of significance for early prevention of BCI.
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Objective To study the effect of continous subcutaneous insulin infusion (CSII) and mutiple subcutaneous insulin infusion (MSII) on type 2 diabetes mellitus during perioperation. Methods One hundred and eighty surgical patients complicated with Type 2 diabetes were randomly divided into two groups,98 cases in the CSII group (treated with CSII of novolin R) and 82 cases in the MSII group (treated with MSII of novolin R and no-volin N). Blood glucose level,the time to reach normal blood glucose level, the average dosage of insulin, the inci-dence of hypoglycemic,infection rate of incisions and inpatient days were measured in two groups before and after treatment. Results The level of fasting blood glucose after treatment in the CSII group (4.8 mmol/L (SD: 1.6)) was significantly lower than that of the MSII group (6.4 mmol/L(SD :2.1)) (t = 7.74,P < 0.05), and 2-h glucose in the CSII group (7.6 mmol/L(SD :2.3)) was significantly lower than that of the MSII group (9.3 mmol/L(SD: 2.4)) (t = 7.72, P < 0.05). The time to reach normal blood glucose level in the CSII group (4.1 days (SD: 2.9)) was shorter than that of MSII group (6.9 days (SD :2.0)) (t=2.81, P < 0.05). The average dosage of insulin in the CSII group (40.7 U(SD: 10.3)) was lower than that of the MSII group (63.2 U (SD: 17.0)) (t=3.57, P <0.05). The incidence of hypoglycemic in the CSII group (3.05%) was lower than that of the MSII group (9.20%) (χ~2 = 4.92,P < 0.05). The infection rate of incisions in the CSII group (0.0%) was lower than that of the MSII group (10.9%) (χ~2 =4.18, P < 0.05). The inpatient days in the CSII group (15.3 days (SD :7.2)) was shorter than that of the MSII group (22.5 days (SD :9.7)) (t = 3.12, P < 0.05). Conclusions Compared to multiple sub-cutaneous insulin infusion, continuous subcutaneous insulin infusion is more effective in controlling blood glucose, hypoglycemic and incision infection, thus is recommend to perioperative patients complicated with type 2 diabetes mellitus.