Active clinical trials for "Hepatitis A"

The aim of this study is to describe the safety profile of Avaxim 80U Pediatric, in order to confirm the good safety profile of the vaccine. Primary objective: To describe the safety of Avaxim 80U Pediatric after each dose of vaccine administered 6 months apart, in subjects aged 12 months to 15 years.

Vaccines are one of our most effective public health tools but many who need them don't respond well and are not protected. Adjuvants boost immune responses and are commonly included in vaccine preparations. Bisphosphonates are the most commonly prescribed treatment for osteoporosis and may represent a new class of adjuvant. Bisphosphonates are well tolerated with chronic administration and have very few adverse effects. Research suggests that these medications can stimulate the immune system. Bisphosphonates are of special interest in populations with impaired immunity and an inability to amount protective antibody responses following immunizations. We propose a pilot study to evaluate the clinical relevance of this finding in humans. We will study the effect of bisphosphonates on quantitative humoral immune response to hepatitis B vaccine in healthy older volunteers who have not previously received this vaccine.

The purpose of this study is to determine the safety and immunogenicity of the recombinant hepatitis E vaccine in people older than 65 years, and evaluate the efficacy of hepatitis E vaccine in this population.

The purpose of this study is to determine the change from baseline in HCV Ribonucleic acid (RNA) on Day 4 following three days of dosing with BMS-929075 in chronically genotype subtype 1a and 1b HCV infected subjects

This is a randomized, double-blind clinical trial of two inactivated hepatitis A vaccines in healthy children, immunogenicity and interchangeability of the two inactivated hepatitis A vaccines were evaluated.

Chronic hepatitis B (CHB) infection is complicated by cirrhosis and liver cancer. In Thailand, 7% of adults are chronically infected by Hepatitis B virus (HBV). The risk of perinatal transmission of HBV is about 12% when a mother has a high HBV load in her plasma, even if her infant receive specific immunoglobulin and vaccine. The hypothesis of this study is that a potent antiviral, tenofovir, can decrease HBV load in HBV infected pregnant women and therefore reduce the risk of perinatal transmission/ Pregnant women participating in this study will receive tenofovir or placebo during the last trimester of pregnancy and two months postpartum. The risk of perinatal transmission will be compared between the two groups. The results of the study will help define policy to manage HBV infected pregnant women to prevent perinatal transmission.

The purpose of this study is to design an intervention to increase hepatitis B (HBV) screening among Korean Americans. The investigators will design a culturally specific intervention (educational sessions) and test the effect of the intervention on 1200 Korean Americans. All subjects will be interviewed before the intervention/control sessions and 6 months after the sessions to assess HBV screening levels in the two groups. Self-reported HBV screening will be verified by a review of subjects' medical records. The primary study hypothesis is that the intervention group will have a higher rate of HBV serologic testing at follow-up compared to the control group.

This study will evaluate the persistence of the immune response to HAV (Hepatitis A Virus) antigens and HBs (Hepatitis B surface) antigens in healthy adults previously vaccinated with GlaxoSmithKline (GSK) Biologicals' Twinrix Adult. The subjects will be invited for blood sampling 16, 17, 18, 19 and 20 years after vaccination to evaluate the antibody persistence. For subjects in whom low circulating antibodies are detected, the presence of immune memory against hepatitis A & B antigens will be investigated by the administration of a challenge dose of the appropriate vaccine (Havrix and/or Engerix-B) at the next planned visit. No new subjects will be recruited during this study.

The aim of this Observer-blind study is to compare different Adjuvant Systems with the same, well-known antigen (HBsAg) already used in the GSK marketed vaccines against Hepatitis B (Engerix-BTM and FendrixTM), in order to better understand the immune response induced by each of the Adjuvant System. This Protocol Posting has been updated following Protocol amendment 6, October 2009. The section impacted is Eligibility Criteria

This study will evaluate the immune response against Hepatitis-A (HAV) and Hepatitis B surface (HBs) antigen in healthy subjects aged 12 to 15 years (at the time of primary vaccination), who received vaccination course with GSK Biologicals' Twinrix Adult and Twinrix Junior vaccine, approximately 10 years ago in the primary study. The subjects will be invited for blood sampling at 11, 12, 13, 14 and 15 years after primary vaccination to evaluate the persistence of immune response. For subjects detected with decreased immunity, the presence of immune memory against hepatitis A & B antigens will be investigated by the administration of a challenge dose of the appropriate vaccine 6 to 12 months after the Year 15 follow-up time-point. No new subjects will be recruited during this booster phase of the study.