Cells, Cultured ; Hepacivirus ; isolation & purification ; Hepatitis C ; virology ; Humans

Enzyme-Linked Immunosorbent Assay ; Hepacivirus ; isolation & purification ; Hepatitis C ; virology ; Humans

OBJECTIVETo investigate the viral contamination of invasive medical instruments in dentistry and to provide health administrative institutions with surveillance data.

METHODSSterilized samples were randomly collected from the department of dentistry to detect HBV-DNA, HCV-RNA, HIV-RNA and HBsAg.

RESULTSOf the invasive medical instruments that were sterilized with 2% glutaraldehyde, one of the samples was positive for HBV-DNA, and another sample was positive for HBsAg.

CONCLUSIONThough massive virus contamination of invasive medical instruments in dentistry has been reduced to a low level, the occurrence of contamination still remains.

DNA, Viral ; analysis ; Dental Instruments ; virology ; Equipment Contamination ; HIV ; isolation & purification ; Hepacivirus ; isolation & purification ; Hepatitis B Surface Antigens ; analysis ; Hepatitis B virus ; isolation & purification ; Humans ; RNA, Viral ; analysis

Arrhythmogenic Right Ventricular Dysplasia ; virology ; Female ; Flavivirus ; isolation & purification ; Hepacivirus ; isolation & purification ; Humans ; Microscopy, Electron ; Middle Aged ; Myocytes, Cardiac ; virology ; Virion ; isolation & purification

OBJECTIVETo determine the distribution of HCV genotypes among volunteer blood donors in Guangzhou.

METHODSSix-nine HCV RNA-positive samples were collected from volunteer blood donors in Guangzhou. NS5B fragments of HCV were amplified followed by DNA sequencing and phylogenetic analysis.

RESULTSHCV genotypes were determined for 67 samples. Among them, the subtypes 1b, 2a, 3a, 3b, 6a and 6n were detected at the frequencies of 37.31%, 4.48%, 7.46%, 4.48%, 44.78% and 1.49%, respectively.

CONCLUSIONHCV 1b and 6a are the most predominant two subtypes among volunteer blood donors in Guangzhou.

Blood Donors ; China ; Genotype ; Hepacivirus ; classification ; genetics ; isolation & purification ; Humans ; Phylogeny ; RNA, Viral ; genetics ; Sequence Analysis, DNA

BACKGROUND/AIMS: As a preliminary study to test the possibility of oral transmission of hepatitis C virus (HCV), many investigations in order to detect the extrahepatic localization of HCV have been performed. In this study, we examined the presence of HCV viral proteins in gastric mucosa. METHODS: Immunohistochemical staining to NS3 protein were done to detect the HCV virus in gastric mucosa. The results were compared with NS5a protein staining to confirm the NS3 protein staining. RESULTS: Total of 164 patient were included. 58 patients with anti-HCV (+) were designated to case group and 70 with anti-HCV (-) to control group. 36 were excluded in this study due to concomittent illness. Anti-HCV (+) group showed 50.0% (29/58) of positivity to NS3 protein staining and anti-HCV (-) group showed 12.6% (9/70) of positivity (p<0.001). Immunohistochemical staining to NS5a protein were done to validate the result of NS3 (+) staining in the anti-HCV (+) group (n=58). NS5a (+) staining were observed in 58.6% (34/58). The results of NS5a staining were consistent with that of NS3 in 70.7%. The reliability coefficients by Chronbach's Alpha for NS3 and NS5a stain test was 0.59. CONCLUSIONS: HCV can exist in gastric mucosal cell as an extrahepatic presence. In the future, this study may provide some fundamental data for the research of possible oral transmission route of HCV.
Aged ; English Abstract ; Female ; Gastric Mucosa/*virology ; Hepacivirus/*isolation & purification ; Hepatitis C Antigens/*analysis ; Humans ; Male ; Middle Aged

OBJECTIVETo establish hepatitis C virus (HCV) infected cell model which is similar to the infection in vivo and can support HCV to replicate for a long time.

METHODSAfter infected with HCV-positive serum, Hep G2 cells were cultured for 60 days. Nested RT-PCR was used to detect plus and minus HCV RNA in cultured cells and supernatants.

RESULTSPlus HCV RNA was detected intermittently in Hep G2 cells during 2-30 days, minus HCV RNA was detected during 3-30 days after infection, the detection rate was similar to plus HCV RNA. Plus and minus HCV RNA can be still intermittently detected during 31-60 days after infection. However, the detection rate gradually declined. Plus HCV RNA was also found intermittently positive in the supernatant, and the detection rate was consistent to that in cells. Minus HCV RNA was not detected in the supernatant.

CONCLUSIONHep G2 cells were susceptible to HCV, and could support HCV to replicate for a relatively long time. Hep G2 is an ideal HCV infection cell model.

Cell Line, Tumor ; Hepacivirus ; genetics ; growth & development ; Humans ; RNA, Viral ; genetics ; isolation & purification ; Reverse Transcriptase Polymerase Chain Reaction ; Virus Replication

OBJECTIVESTo evaluate the correlation between signal/cutoff (S/CO) ratios of anti-HCV EIA and their true positivity for determining the predictive value of S/CO ratios.

METHODSOne hundred and fifty-nine samples of blood from donors positive for anti-HCV at the initial screening were collected from Beijing, Guangzhou, Hangzhou, Kunming and Urumchi. All the samples were retested by Ortho and 6 Chinese domestic anti-HCV EIA kits in duplicate, and detected for HCV RNA (NAT) using Chiron Procleix HIV/HCV system (transcription mediated amplification, TMA). The HCV RNA negative samples were further tested for anti-HCV by Chiron RIBA 3.0. Either NAT or RIBA positive samples were interpreted as the true positive.

RESULTSAll 7 anti-HCV EIA kits had a significant correlation between S/CO ratios and true positivity. The S/CO ratio of Ortho > or = 3.8 predicted the true positivity in 96.1% of the samples tested. The S/CO ratios of BGI-GBI, GWK, SABC, KHB, InTec, and Wantai were > or = 7.0, > or = 10.0, > or = 6.0, > or = 10.0, > or = 8.6, > or = 14.0 and predicted 96.1%, 96.1%, 97.3%, 96.0%, 96.1%, 96.0% of the true positivity, respectively.

CONCLUSIONSThe S/CO ratios of anti-HCV EIA kits are associated with the true positivity. S/CO ratios of Ortho, BGI-GBI, GWK, SABC, KHB, InTec and Wantai predicting > or = 95% true positivity are > or = 3.8, > or = 7.0, > or = 10.0, > or = 6.0, > or = 1 0.0, > or = 8.6 and > or = 14.0, respectively.

Blood Donors ; Hepacivirus ; isolation & purification ; Humans ; Immunoenzyme Techniques ; methods ; Predictive Value of Tests ; Reagent Kits, Diagnostic ; Sensitivity and Specificity

Hepacivirus ; isolation & purification ; Humans ; Leukocytes, Mononuclear ; virology ; RNA, Viral ; blood ; Reverse Transcriptase Polymerase Chain Reaction ; methods ; Viremia ; virology

In order to standardize and update the prevention, diagnosis and antiviral therapy of hepatitis C and to achieve the World Health Organization's goal of eliminating viral hepatitis as a public health threat by 2030, Chinese Medical Association, the Chinese Society of Hepatology, and the Society of Infectious Diseases organized relevant native experts in 2019 to revise the guideline for the prevention and treatment of hepatitis C (2019 version) based on the basic, clinical and prophylactic research progress of hepatitis C infection at home and abroad, combined with the present actual situation of our country, so as to provide an important basis for the prevention, diagnosis and treatment of hepatitis C.
Antiviral Agents/therapeutic use* ; Hepacivirus/isolation & purification* ; Hepatitis C/virology* ; Humans ; Practice Guidelines as Topic ; Public Health ; World Health Organization