ABSTRACT
WU polyomavirus, which was firstly discovered in 2007, is a new human polyomavirus belonging to Polyomaviridae and containing circular double-stranded genomic DNA. In this study, the 278 clinical sputum specimens from children under 5 years old were collected from Wenzhou Medical College affiliated Wenling First Hospital, Zhejiang Province. Based on identification assay of WU polyomavirus previously reported, a WU polyomavirus was identified from clinical samples successfully, the positive rate was 0.4%. The sequences of PCR products were identical to that of VP2 gene and large T antigen gene derived from WU polyomavirus reported. The above results strongly suggested that the WU polyomavirus isolated was firstly found in Chinese children with acute lower respiratory tract infections. This study provides a firm basis for further research of WU polyomavirus.
Subject(s)
Child, Preschool , Humans , Infant , Infant, Newborn , Base Sequence , Molecular Sequence Data , Polymerase Chain Reaction , Polyomavirus , Genetics , Sputum , VirologyABSTRACT
KI polyomavirus, which was firstly discovered in 2007, is a new human polyomavirus belonging to Polyomaviridae and containing circular double-strand genomic DNA. This study was based on identification assay of KI polyomavirus reported. Total 2293 clinical sputum specimens from children under 3-years-old were collected and screened from Wenzhou Medical College affiliated Wenling Hospital, Zhejiang Province. A KI polyomavirus was detected and identified, the positive rate was 0.04%. The sequences of PCR products was identical to that of the viral capsid protein (VP1) gene derived from KI polyomavirus. The results strongly suggested that the KI polyomavirus was found firstly in Chinese children with acute lower respiratory tract infections from Zhejiang region. This study provided new information for further investigation of etiopathogenisis and diagnosis in children with lower respiratory tract infections.
Subject(s)
Child, Preschool , Humans , Infant , China , Polymerase Chain Reaction , Polyomavirus , Respiratory Tract Infections , VirologyABSTRACT
<p><b>OBJECTIVE</b>In this study, human bronchial epithelial cells were inoculated with positive sputum specimens of HBoV. After four days' infection, cytopathic effects (CPE) were observed by inverted microscopy. These viruses all cause typical cell damages such as rounded and shrivelled, fusion and fallout. These damages got quick following increased future degenerations. The other assay result of CPE within the infected cells were observed by inverted microscopy, have typical "owl's eye" plaque and above 90 percent hemadsorption within the infected cells by erythrocytes for hemadsorption technique. The typical fluorescence lump of nucleus within the infected cells was found by indirect immunofluorescence technique.</p><p><b>CONCLUSION</b>Isolation and identification of HBoV could be done in the human bronchial epithelial cell, and we found some characterizing CPE in the human bronchial epithelial cell after HBoV infection. The above studies pave a way for studying pathogenicity of human bocavirus.</p>
Subject(s)
Humans , Bocavirus , Physiology , Bronchi , Cell Biology , Cell Death , Physiology , Cell Survival , Physiology , Cells, Cultured , Epithelial Cells , Cell Biology , Virology , Fluorescent Antibody Technique, Indirect , Host-Pathogen Interactions , Microscopy, FluorescenceABSTRACT
<p><b>OBJECTIVE</b>To explore the relation between hepatitis B virus DNA load and genotype with the level of large envelope protein.</p><p><b>METHODS</b>Serum HBV DNA was quantitively detected by using real time polymerase chain reaction (RT-PCR). The LHBs were detected by using enzyme linked immuno sorbent assay (ELISA) and HBV markers were detected by time differentiate immunofluorescence assay in 140 serum samples collected from chronic hepatitis B patients.The genotypes of HBV were identified by DNA sequencing; and analyze their relationship.</p><p><b>RESULTS</b>There was no significant difference between positive rate of LHBs and that of HBV DNA in HBeAg negative and positive group (P > 0.05); The HBV LHBs absorbency was markedly correlated with the HBV DNA load ( R2 = 0.9267). The difference of HBV LHBs absorbency between HBV genotype B and C was not significant.</p><p><b>CONCLUSIONS</b>The close correlation between HBV LHBs absorbence and HBV DNA load illustrated that he level of serum LHBs can be used to estimate the state of HBV replication; and there is no relationship between HBV LHBs absorbency and genotypes. So HBV LHBs may be used as a new serological marker to detect HBV replication.</p>