A preliminary serologic survey of TORCH infections in Chongqing was performed.Sera from 160 adults,most of them were women of child bearing age and from 100 newborn cord blood,were collected. They were tested for antibody to Toxoplasma gondii(total and IgM)by the IFA technique, cytomegalovirus (CMV) IgG and IgM by ELISA, rubella virus by latex agglutination test,and herpes simplex virus(HSV)by complement fixation (CF). The positive rates among adults for antibody to T. gondii, CMV, rubella virus and herpes simplex virus were 32.6%, 72.0%, 89.4% and 79.4% respectively; and the positive rates of cord sera were 21.4%, 78.3%,78.9% and 90.7% respectively. From these result, rubella vaccination appears indicated along with education concer-ning the dangers of and methods of avoiding T. gondii, CMV, and HSV infections.

Objective To study the relationship between the gene mutations of DNA gyrase subunit A(gyrA)and quinolone resistance in Salmonella typhi. Methods The genes of gyrA DNA of Salmonella typhi S275(a clinically isolated quinolone susceptible strain)and its spontaneous quinolone-re-sistant mutant RGl were examined in this study with polymerase chain reaction(PCR),restrictive frag-ments length polymorphism(RFLP),single strand conformational polymorphism(SSCP)and nucleotide sequencing. Results Nudeotide sequencing of gyrA in Salmonella typhi S275 revealed that the bases of 128～426 kept highly conservative as compared with those of Escherichia coli KL-16,with only 7.49%difference in the gyrA nucleotides 128～426 between the two strains.Most of the mutations were silent mutations,which contributed to 3 amino acid substitutions in gyrase(including Thr-45→His,Arg-49→Leu and Val-56→Gly),and all these substitutions were located outside the quinolone resistance determining re-gion(amino acids 67-106 of subunit A of gyrase).In comparison with Salmonella typhi S275,a single mutation was found at base 247 of gyrA of Salmonella typhi RG1,with change transferred from T to G and led to a substitution of Ser-83→Ala.The mutation might be responsible for the increase of MICs of nalidixic acid,ofloxacin and ciprofloxacin against Salmonella typhi from 2,0.06 and<0.03 to 512,2,and 1 mg/L respectively.Ser-83→A1a was also a newly discovered substitution in gyrA of Salmonella spp.The results of PCR-RFLP and SSCP were in concordance with results of nucleotide sequencing. Conclu.sions The mutation of gyrase at the 83rd amino acid maybe play a principal role in the resistance of Salmonella typhi to quinolone.

This paper reports the changes in susceptibility of Salmonella spp. to 32 antimicrobial agents from 1959 to 1988. The clinical observation on the treatment of typhoid fever caused by drug-sensitive and resistant strains of S. typhi arc also reported. Resistant Salmonella began to appear from the year of 1986. The in vitro studies indicated that drug-resistant S. typhi were resistant to commonly anti-typhoid agents such as chloramphenicol, SMZ/TMP, ampicillin and other drugs, but were very sensitive to new quinolones and the third generation cephalosporins. The .therapeutic effects correlate well with the in vitro sensitivity tests. Typhoids caused by drug-sensitive strains responded well when treated with chloramphenicol, SMZ/TMP or ampicillin, while those caused by resistant strains only responded well to norfloxacin or its combi-nation with other drugs

Objective To investigate the mechanism of cross resistant inducibility of ciprofloxacin and imipenem which led to cross resistance in Pseudomonas aeruginosa in vivo. Methods Cross resistant mutant strains were selected and induced with clinical isolates of P.aeruginosa PA5 susceptible to ciprofloxacin and imipenem by experiment of murine peritonitis. Mutation of DNA gyrase gene, drug uptake and membrance proteins of P.aeruginosa PA5 and its mutants resistant to ciprofloxacin and imipenem were examined. Results Both ciprofloxacin and imipenem could induce resistant strain of P.aeruginosa in experimental murine peritonitis, the cross resistance rates after ciprofloxacin and imipenem challenge were 3.8% and 0.98% respectively. The results of PCR SSCP showed that 3 of six cross resistant of P.aeruginosa strains had gyrA gene mutation. Electrophoresis of outer and inner membrane proteins did not exist any difference between cross resistant strains and their parent strain PA5. Fluorometric assay for ciprofloxacin uptake by bacterial cells indicated that the accumulation of ciprofloxacin in all cross resistant variants decreased to 1/2～1/3 compared with that of PA5. After chanllenge with CCCP, the drug uptake in cross resistance mutants increased to the same level as in PA5. Conclusions The results show that cross resistant strains of P. aeruginosa could be selected and induced in vivo. Active drug efflux is the major factor contributing to the cross resistance of P. aeruginosa to both quinolone and imipenem.

Albendazole and mebendazole were comparatively evaluated in 22 adult patients for their in vivo effects on hookworm eggs. Both drugs were given 200mg twice daily for three consecutive days. Stool specimens wore collected before treatment and during the following five days. The Stool egg count was carried out by Stolls method and each specimen was also cultured by Hara-da-Mori technique for at least eight days. The mean pre-treatment percentage of incubated hookworm eggs that developed to larvae was 75.3% in albendazole group and 68.8% in mebendazole group respectively. One day following the initiation of treatment the mean percentage was remarkably reduced to 0.25% in albeadaole group and no eggs developed to larval stage beyond day 1. 0ne day and two days following the initiation of treatment the mean percentage was 16.23% and 23.13% respectively in mebendazole group. No eggs developed to larval stage on day 3 and thereafter. Albendazole seems to have better ovicidal effect than mebendazole.Albendazole and mebendazole were also comparatively evaluated in 123 adult patients with single or mixed infections of hookworm, ascarisis, and trichuris. A single dose of 400mg was used for both drugs. 2 and 4 weeks after treatment, their stools were examined by brine flotation technique. The hookworm eggs negative conversion ratss 2 weeks after treatment were 78.8% and 26.4% respectively in albeadazole and mebendazole group; while those 4 weeks after treatment were 74.1% and 25.5% respectivley. For ascariasis, the eggs negative conversion rates were 98.0% and 92.0% respectively. For trichuriasis, the negative conversion rates were only 20.6% and 27.7% respectively

Objective:To evaluate high-risk human papillomavirus (hrHPV) genotyping and viral load in predicting CIN (cervical intraepi-thelial neoplasia (CIN) grade 2 or worse in a Chinese rural area population with limited health resources. Methods:We performed a population-based prospective study and enrolled 2,257 women aged 35 to 64 years from three rural screening sites of Jiangxi prov-ince. We conducted a hybrid capture (HC-2) assay to predict viral load. A HC-2 relative light unit (RLU) threshold of 10 was set to differ-entiate samples between low (<10) and high (≥10) viral loads. We also carried out a HybriMax test to detect different hrHPV geno-types in the samples. Women exhibiting positive HC-2 or HybriMax results underwent colposcopy and colposcopically directed biopsy. Women with negative or positive hrHPV test results but with normal biopsy or CIN1 were followed-up for 24 months without interven-tion (n=2,211). We used histopathological findings as outcome. Results:Of the 2,211 women, 1,636 provided complete follow-up data. Of the 132 women with a high viral load, 4 (3.03%) developed CIN2+in the same period. The relative risk (RR) of CIN2+for HC-2 posi-tivity at baseline was 42.24 (95%CI=4.76-375.2). Of the 159 women who were positive for HPV16 or HPV18 upon screening, 4 (2.52%) progressed to CIN2+(RR=33.06, 95%CI=3.72-293.9). The 2-year cumulative incidence rates of CIN2+did not significantly differ be-tween the high viral load group and the HPV16/18 group. Conclusion:The risks of CIN2+progression were higher among women with a high viral load or HPV16/18 positivity than among women with negative hrHPV. Increasing the HC-2 cut-off value to 10 RLU or using HPV16/18 positivity may be similarly used to triage hrHPV-positive women for immediate colposcopy and comprehensive follow-up.Both approaches were equally predictive of the CIN2+risk in rural area. Increasing the HC-2 cut-off value to 10 RLU may also help allo-cate health resources effectively.

Objective To explore the clinical efficacy of nibble debridement combined with silver ions dressing in treatment of diabetic foot ulcer.Methods The data of 238 patients with diabetic foot ulcer in people's hospital of Meishan from January 2012 to December 2016 were retrospectively analyzed.Of which 125 patients were treated by nibble debridement combined with silver ions dressing(nibble debridement group),113 patients were treated with surgical debridement combined with silver ions dressing(surgical debridement group).The clinical efficacy,wound healing time and complication between two groups were compared.Results The wound healing time of nibble debridement group was (37.5 ± 10.8) days,which was shorter than (45.3 ± 11.7) days of surgical debridement group,the difference was significant (P ＜0.05).The total effective rate of nibble debridement group was 92.80％,which was higher than 73.45％ of surgical debridement group,the difference was significant(P ＜ 0.05).No complication occurred in two groups.Conclusion The method of nibble debridement combined with silver ions dressing treatment has a better satisfactory clinical result,shorter wound healing time and lower medical costs for patients with diabetic foot ulcer.

Artemisinin is the antidote to malaria, and has made hundreds of millions patients get rid of the disease since application in clinic. At present, the main accesses to artemisinin are directly extracted from Artemisia annua,chemical synthesis and biosynthesis. By comparing the differences of artemisinin production process between China and abroad, this research analyzes the reasons of the problem, and put forward their views and suggestions, so as to provide references for Artemisia annua further research.

Ulta performance liqiuid chromatography-triple quadrupole tandem mass spectrometry ( UPLC-MS/MS) was used to monitor the relative levels of bufadienolides in toad venom in normal and bensulfuron-polluted groups. Methanol extract of toad venom was separated by UPLC ( ODS-C18 ) using a gradient elution of water contains 0. 1% formic acid and acetonitrile. Mass spectrometry was used in an ESI source operated in positive ion and MRM mode. The parameters in the source were set as follows: capillary voltage 3. 0 kV; sampling cone voltage 30 V; and desolvation temperature 500℃. In this method, external calibrations of 6 standards were typically constructed (R2=0. 9953-0. 9992). The LOD was 0. 42-4. 86 ng/mL. Intra- and inter-day precision was 3. 8%-6. 8% and 4. 0%-8. 8%, respectively. The recovery of standard was evaluated by spiking the standard compound into toad venom. Their average recoveries were 96. 9%-109. 6%, and RSDs were 2. 0%-8. 1%. This method was further employed into monitoring the levels of 36 bufadienolides. The levels of more than 20 bufadienolides were greatly different after bensulfuron pollution, suggesting that the bensulfuron pollution could change the chemical expression pattern of bufadienolides in toad venom.

Objective:To study the relationship between hepatitis B surface antigen(HBsAg)and the primary liver cancer (PLC).Methods:A 20-year prospective follow-up study was performed continuously in Qidong on a cohort of 515 HBsAg positive male patients aged 20-60 years old.The markers of hepatitis B virus,HBsAg,HBsAb,HBeAg,HBeAb and HBcAb (HBVM 1,2,3,4,5)were detected at the first time of the follow-up.Results:The PLC incidence of the whole cohort was 1340.90/100 000 person years(PY).The middle age of the PLC diagnosis was 43 with an average survival of 15 months.The PLC incidence was significantly higher in 41-50 age group than that of other age groups(P＜0.05).The three major HBVM patterns were 15,135 and 145 in the cohort with percentages of 38.83%(200/515),15.92%(82/515)and 44.08%(227/515)respective1y.The PLC incidences of these three patterns were 1 433.69/100 000 PY,2 284.71/100 000 PY,984.10/100 000 PY respectively,showing a significant difference between 135 and 145(P＜0.01).The percentages of 15,135 and 145 were 39.64%(44/111),23.42%(26/111)and 35.14%(39/111)in PLC patients respectively,showing a significant difference between 15 and 135(P＜0.01).The liver cirrhosis mortality of those three patterns were 195.50/100 000 PY,966.61/100 000 PY and 277.57/100 000 PY respectively,showing the significant differences between 135 and other two patterns(P＜0.01).Conclusion:HBsAg carriers were high risk population of PLC.The regular following-up is helpful on early diagnosis and treatment of PLC in those people,and can prolong the survival time.It was found that 135 had higher PLC risk than other HBVM patterns,suggesting a relationship between HBV duplication and PLC.The anti-virus treatment may delay or remove the occurring of PLC.