OBJECTIVE To compare the cleaning effect of the dentistry high speed turbine wheel handset by the three purging methods,i.e.,manual,the entire automatic ultrasonic wave and the entire automatic hot cleaner/sterilizing machine.METHODS The Staphylococcus aureus was used to pollute dentistry handset,then the quota sterilization experiment was carried out.RESULTS 99.47%,99.80%,and 99.99% of the extinguishing rate were got by the manual,the ultrasonic wave cleaner and the entire automatic hot cleaner/sterilizing machine purging methods respectively,after the SPSS13.0 variance analysis,P

To prepare the polyclonal antibody against the 3D polymerase of foot and mouth disease virus (FMDV), the 3D polymerase gene of this virus was amplified by PCR and doubly digested with BamH I and Nde I. Then, it were cloned into expression vector pET-30a(+) to obtain the recombinant plasmid pET-3D and this plasmid was transformed to E.coli BL21(DE3) with induction by IPTG.The target protein was identified and purified with SDS+PAGE, and the inclusion bodies were extracted. The purified target protein was used as antigen to immunize New Zealand rabbits to prepare the polyclonal antibody against 3D polymerase of FMDV, which was then characterized by indirect ELISA and Western blotting. As demonstrated by SDS-PAGE, the target protein with a molecular weight at 46 ku was expressed. The polyclonal antibody showed high affinity and obvious specificity and its titer was above 1:8 000. This polyclonal antibody may lay a foundation for the further studies on the biological functions and epitopes of the 3D polymerase of FMDV.

Objective To analyze the distribution of various genotypes of human cytomegalovirus glycoprotein N ( HCMV gN) in patients with HIV infection; to investigate the effects of HCMV-HIV co-in-fection on disease progression and the relationships between HCMV gN genotypes and disease progression. Methods Patients with active HCMV infection were screened out from 359 patients with HIV infection by using the pp65 antigenemia assay.The genes encoding HCMV gN ( UL73 ) were amplified by nested PCR ( nPCR) .The amplicons were digested by restriction enzymes including MboⅠ, ScaⅠ and SalⅠ.Then, the restricted fragment length polymorphisms were further analyzed on 4%agarose gel.The relationships be-tween HCMV genotypes and the morbidity and mortality of acquired immune deficiency syndrome ( AIDS ) were investigated via a prospective study.Results Among the 359 patients with HIV infection, 28 subjects were positive for the HCMV pp65 antigenemia assay.The HCMV gN genotypes in 20 patients with active HCMV infection were distributed as: gN-3a (4/20, 20%), gN-1 (4/20, 20%), gN-4d (1/20, 5%), gN-4b (1/20, 5%) and mixed infection (10/20, 50%).Patients with HCMV-HIV co-infection were more likely to develop AIDS during the follow-up period (RR=9.78).Patients harboring HCMV gN-1 and gN-4 genotypes would seem likely to have 4.6 times of chance leading to AIDS-associated death than those harbo-ring other HCMV gN genotypes.Conclusion HCMV infection ( especially gN-1 and gN-4 genotypes) might accelerate the progression of HIV infection.

Objective To analyze the different metabolites of the classical activated (M1) ,alternatively activated (M2) and resting BV2 cells by metabolomics method .Methods The mRNAs of several potential biomarkers were determined by real-time PCR analyses to confirm the state of BV2 cells .Static GC-MS combined with metabolomics technology was used to analyze the metabolic changes .Results There were 15 biomarkers identified between the M1 group and the resting group ,and 15 biomarkers were found in the M2 group and the resting group .Conclusion The present study provides an effective way to reveal the mechanism of the polarization of BV 2 cell ,and it might provide a theoretical basis to prevent or treat the neurodegen-erative diseases .

ObjectiveTo describe a COVID-19 outbreak due to SARS-CoV-2 Omicron variant in a school and provide suggestions for COVID-19 prevention and control. MethodsData on the COVID-19 outbreak in a school in Putuo District of Shanghai were collected from November 14 to December 20， 2022. Epidemiological characteristics， incidence rate of secondary cases and response measures were described and analyzed. ResultsA total of 27 COVID-19 cases were identified infected with SARS-CoV-2 Omicron BA.5.2 variant， including 14 students （51.9%） and 13 family members / teachers living with those students （48.1%）. The first case occurred on November 14， with peak incidence during November 16-18. The median generation interval of the second generation cases was 2 （2，3） days. The index case （case 1， a student） had a clear contact history outside the school， which was found through routine examination in key populations in the school. Immediate management was conducted after the notification. All the second generation cases were exposed students in the same class with case 1， which were identified during the quarantine， whereas the third generation cases were their family members/teachers living with the second generation cases. The incidence rate within the class and school were 36.8% and 3.0%， respectively. No further social transmission was found outside the school. ConclusionEarly detection， multi-sectoral collaboration， prompt control and quarantine measures are effective in containing SARS-CoV-2 transmission. Health promotion， surveillance， ventilation and prophylactic disinfection should be reinforced in schools， office buildings and other gathering places.