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Objective To investigate the molecular characteristics of dengue virus serotype 2 (DENV2) in Guangzhou during 2001-2015,and analyze the E gene of the strains isolated,the phylogenetic tree and molecular clock were constructed to know about the evolution of the strains.Methods The serum samples of the patients were detected by real time PCR,and positive samples were used to isolate dengue virus by using C6/36 cells.The E gene of the isolated strains were sequenced.The phylogenetic tree was constructed by using software Mega 4.0,and the molecular clock was drawn by using software BEASTv1.8.2.Results Twenty-six dengue virus strains were isolated between 2001 and 2015.They were all clustered into 2 genotypes,i.e.cosmopolitan genotype and Asian genotype Ⅰ.The strains isolated in Guangzhou shared high homology with Southeast Asian strains.The cosmopolitan genotype was divided into 2 sub-genotype at about 46 and 35 years ago.The substitution rate of dengue virus serotype 2 in Guangzhou was 7.1 × 10-4 per year per site.Conclusions There were close relationship between the Guangzhou strains and Southeast Asian strains.Guangzhou was at high risk of imported dengue fever,outbreak of dengue hemorrhagic fever and dengue shock syndrome.There might be two ways of introduction of cosmopolitan genotype.The substitution rate of the strains in Guangzhou was similar to that in the neighbor countries.
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Objective To describe the clinical characteristics and outcomes of dengue virus infection during pregnancy . Methods A retrospective study was performed based on the clinical data of manifestations ,pregnancy outcomes and neonates in patients with dengue virus infection during pregnancy from January 1st ,2014 to December 31th ,2014 at maternity ward in Guangzhou .Results The most common manifestations in patients with dengue virus infection during pregnancy were fever (100 .0％ ) , body soreness (42 .9％ ) ,headache (41 .3％ ) ,cutaneous rash (41 .3％ ) ,fatigue (34 .9％ ) and muscle pain or arthralgia (17 .5％ ) , nausea and vomiting (12 .7％ ) . The decline proportions of leukocyte , platelet and neutrophil count were 17 .5％ ,20 .6％ and 6 .3％ ,respectively ,and the lowest point was observed on 5 — 6 days after the onset of illness .Miscarriage was observed in 3 pregnant patients (4 .8％ , all in the first trimester ) ,intra-uterine death in one patient (1 .6％ ,at 22 weeks of gestation) and artificial abortion in 2 cases .A total of 48 patients delivered ,among whom caesarean section rate was 37 .5％ , prematurity rate was 12 .5％ and low birth weight rate was 8 .2％ .Maternal – foetal vertical transmission happened in 2 cases .Sequence alignment demonstrated that the homologies of the nucleic acids and amino acids within each dengue virus vertical transmission mother-infant pairs were > 99 .9％ .Conclusions The manifestations of dengue virus infected women with pregnancy are not specific .Early detection and early diagnosis should be made according to the history of epidemiology for women with reproductive age in endemic areas .Maternal dengue virus infection during pregnancy might cause vertical transmission and is correlated with bad outcomes of pregnancy , including miscarriage , intra-uterine death and premature birth .Perinatal infection might cause maternal-foetal vertical transmission .
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Objective To investigate the molecular characteristics of dengue virus serotype 2 (DENV2) in Guangzhou during 2001-2015,and analyze the E gene of the strains isolated,the phylogenetic tree and molecular clock were constructed to know about the evolution of the strains.Methods The serum samples of the patients were detected by real time PCR,and positive samples were used to isolate dengue virus by using C6/36 cells.The E gene of the isolated strains were sequenced.The phylogenetic tree was constructed by using software Mega 4.0,and the molecular clock was drawn by using software BEASTv1.8.2.Results Twenty-six dengue virus strains were isolated between 2001 and 2015.They were all clustered into 2 genotypes,i.e.cosmopolitan genotype and Asian genotype Ⅰ.The strains isolated in Guangzhou shared high homology with Southeast Asian strains.The cosmopolitan genotype was divided into 2 sub-genotype at about 46 and 35 years ago.The substitution rate of dengue virus serotype 2 in Guangzhou was 7.1 × 10-4 per year per site.Conclusions There were close relationship between the Guangzhou strains and Southeast Asian strains.Guangzhou was at high risk of imported dengue fever,outbreak of dengue hemorrhagic fever and dengue shock syndrome.There might be two ways of introduction of cosmopolitan genotype.The substitution rate of the strains in Guangzhou was similar to that in the neighbor countries.
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Objective To explore the sleep characteristics in first-episode schizophrenics and the effects of olanzapine on body weight and sleep-breathing disorder.Methods 36 first-episode schizophrenics (patient group) and 33 normal controls (control group) were tested with polysomnography(PSG),and compared the difference of PSG,sleep-breathing index and body mass index(BMI) before and after treatment in patient group.Results Before treatment,compared with control group,the patient group had significantly prolonged sleep latency((83.64± 10.62) min vs (29.41 ± 10.05) min),shortened total sleep time ((286.43 ± 17.04) min vs (343.66 ± 16.38)min),decreased sleep efficiency((65.73 ±11.47) vs (86.13 ± 8.15)),increased awake time and arousal number((65.70 ± 10.33) min vs (25.93 ± 9.60) min ; (38.26 ± 6.88) vs (14.40 ± 2.72)) in sleep continuity ; and increased N1 stage ((87.43 ± 11.35) min vs (36.55 ± 6.40) min),decreased N2,N3 stage ((100.53 ± 10.42)minvs (143.35±13.52)min;(49.83±7.51)minvs (87.52±9.74)min) in sleep structure (P ＜ 0.05).After treatment,sleep continuity and sleep structure in patient group were improved,compared with control group,only BMI,arousal index and hypopnea index had statistic difference (P ＜ 0.05).Conclusion The first-episode schizophrenics have both sleep continuity and sleep structure deficits.Although olanzapine treatment can improve sleep quality,long-term use of it may cause overweight and sleep-breathing disorder.
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Objective To sequence and analyze the envelope (E) gene of type Ⅰ dengue virus isolated from Guangzhou in 2009 for tracing the infection source. Methods The serum samples were collected from patients diagnosed with dengue fever in Guangzhou area during 2009. Dengue virus was isolated and cultured in C6/36 cells.The whole length of E gene was amplified by reverse transcriptase-polymerase chain reaction (RT-PCR) and then sequenced. The phylogenetic tree was drawn by neighbor-joining method. The bioinformatics analysis was performed by combining the phylogenetic information and the epidemiology data. Results Four strains of type Ⅰ dengue virus were isolated from 19 samples. E gene of these strains was amplified and sequenced. The phylogenetic analysis showed that 09/GZ/9104 strain and 09/GZ/9236 strain had identical nucleotide sequence and fell within the American/African group, 09/GZ/11534 stain and 09/GZ/11562 strain had similar sequence homology and fell within the Asian group. Conclusion The typeⅠdengue viruses in Guangzhou area in 2009 are imported, which belong to two genotypes and may come from two independent origins respectively.