Occult Hepatitis B
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Multiple cytokine expression profiles reveal immune-based differences in occult hepatitis B genotype H-infected Mexican Nahua patients
A high prevalence of occult hepatitis B (OHB) genotype H infections has been observed in the native Mexican Nahua population. In addition, a low incidence of hepatitis B virus (HBV)-associated hepatocellular carcinoma has been described in Mexico. The immune response to infection among OHB-infected patients has been poorly evaluated in vivo. Therefore, we as
Memórias do Instituto Oswaldo Cruz. Publicado em: 2011-12
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14. Absence of occult hepatitis B among blood donors in southern Brazil
BACKGROUND: Occult hepatitis B virus (HBV) infection is characterized by the detection of HBV DNA in serum and/or in liver in the absence of detectable hepatitis B surface antigen (HBsAg). The reported prevalence of occult hepatitis B varies markedly among populations and according to the sensitivity of the HBV DNA assay. The aim of the present study was to
Brazilian Journal of Infectious Diseases. Publicado em: 2011-04
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15. Influence of previous HBV infection in patients with chronic hepatitis C: histological assessment / Influência da infecção pregressa pelo vírus da hepatite B em portadores de hepatite C crônica: análise histológica
INTRODUÇÃO: Os vírus das hepatites B (VHB) e C (VHC) são os principais causadores de hepatopatia crônica em todo mundo. Ambos compartilham vias semelhantes de transmissão. Em pacientes portadores crônicos de VHC com sorologia compatível com infecção pregressa pelo VHB (anti-HBcAg[+] e HBsAg [-]), o VHB DNA residual tem sido detectado por técnicas
Publicado em: 2009
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16. Occult hepatitis B virus infection in immunocompromised patients
Occult hepatitis B infection is characterized by hepatitis B virus (HBV) DNA in the serum in the absence of hepatitis B surface antigen (HBsAg). We assessed occult HBV infection prevalence in two groups of immunocompromised patients (maintenance hemodialysis patients and HIV-positive patients) presenting HBsAg-negative and anti-HBc positive serological patte
Brazilian Journal of Infectious Diseases. Publicado em: 2008-08
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17. Occult B infection in the Brazilian northeastern region: a preliminary report
A sentinel study on viral hepatitis is currently being carried out in the village of Cavunge in a semiarid rural region of the state of Bahia, northeastern Brazil. This study has identified individuals in whom anti-HBc IgG was the only serological marker for hepatitis B virus (HBV). This serological pattern may constitute evidence of occult HBV infection. Th
Brazilian Journal of Infectious Diseases. Publicado em: 2008-08
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18. Estudos de expressão do HBsAg: hepatite B oculta, genótipos do HBV e quimeras de HBV e HCV. / Studies of expression of the HBsAg: occult hepatitis B, genotypes of the HBV and chimeras of HBV and HCV.
Introduction: Hepatitis B virus (HBV) is classified into eight genotypes (A-H) that have a distinct distribution in different geographical regions. In Brazil, genotypes A, D and F are the most prevalent. HBV infection is commonly diagnosed by the presence of the surface antigen (HBsAg) in serum. Amino acid mutations may affect HBsAg secretion levels, as well
Publicado em: 2008
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19. Low occurrence of occult hepatitis B virus infection and high frequency of hepatitis C virus genotype 3 in hepatocellular carcinoma in Brazil
Occult hepatitis B virus (HBV) infection has been reported among patients with hepatitis C virus (HCV) infection and hepatocellular carcinoma (HCC). Our aim was to evaluate the presence of occult HBV infection in patients with HCV-related liver cirrhosis (LC) with or without HCC in São Paulo, Brazil. Serum and liver tissue samples from 50 hepatitis B surfac
Brazilian Journal of Medical and Biological Research. Publicado em: 29/11/2007
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20. Hepatite B oculta em pacientes transplantados renais / Occult Hepatitis B in renal transplant patients
Introdução. Hepatite B oculta é caracterizada pela presença do HBV-DNA em pacientes que não expressam o antígeno B de superfície (HBsAg) e é relatada com maior freqüência em pacientes infectados pelo vírus da hepatite C (HCV). Nesse estudo avaliamos a prevalência de hepatite B oculta em transplantados renais infectados ou não pelo HCV e avaliamo
Publicado em: 2007
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21. Patterns of hepatitis B virus infection in Brazilian human immunodeficiency virus infected patients: high prevalence of occult infection and low frequency of lamivudine resistant mutations
Hepatitis B virus (HBV) molecular profiles were determined for 44 patients who were infected with human immunodeficiency virus (HIV) type 1 and had antibodies to the hepatitis B core antigen (anti-HBc), with and without other HBV serological markers. In this population, 70% of the patients were under lamivudine treatment as a component of antiretroviral ther
Memórias do Instituto Oswaldo Cruz. Publicado em: 2006-09
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22. HBV vaccination of HCV-infected patients with occult HBV infection and anti-HBc-positive blood donors
Anti-HBc positivity is a frequent cause of donation rejection at blood banks. Hepatitis B virus (HBV) infection may also occur in HBsAg-negative patients, a situation denoted occult infection. Similarly, very low levels of HBV-DNA have also been found in the sera of patients with chronic hepatitis C virus (HCV) infection, even in the absence of serum HBsAg.
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-04
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23. Occult hepatitis B infection in dialysis patients and in HIV infected patients / Infecção oculta pelo virus da hepatite B em pacientes hemodialisados e em pacientes infectados pelo virus da imunodeficiencia humana
A infecção oculta pelo VHB é caracterizada pela presença do DNA-VHB em indivíduos com o antígeno de superfície (HBsAg) indetectável. A prevalência e significado clínico desta infecção ainda não são totalmente conhecidos. Este trabalho teve por objetivo determinar a prevalência de infecção oculta pelo VHB em dois grupos de pacientes imunossup
Publicado em: 2006
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24. The influence of occult infection with hepatitis B virus on liver histology and response to interferon treatment in chronic hepatitis C patients
Occult hepatitis B virus (HBV) infections have been identified in patients with chronic hepatitis C virus (HCV) infection, although the clinical relevance of occult HBV infection remains controversial. We searched for serum HBV DNA in 106 HBsAg negative/anti-HBc positive patients with chronic HCV infection and in 150 blood donors HBsAg negative/anti-HBc posi
Brazilian Journal of Infectious Diseases. Publicado em: 2004-12