Hepatitis B virus (HBV) infection is very common, with over 350 million chronically infected people worldwide. This review plans to answer some key questions regarding hepatitis B infection during pregnancy, in order to provide healthcare professionals with updated information on the current knowledge in this field. The focus is on the following topics: the main risk factors associated with vertical transmission of HBV in pregnant women who are chronically infected, the influence of pregnancy on HBV viral load, and the effect of pregnancy on the clinical course of chronic hepatitis B. Some recommendations have also been made that may be effective in decreasing the vertical transmission rates of chronic viral hepatitis.

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Hepatitis B virus is a microorganism formed in the excess of surface antigen which is devoid of nucleic acid. Surface antigen of HBV was from the beginning the natural candidate for the vaccine which was thus produced by isolation of plasma HBsAg and later substituted by recombinant protein(s). The Extended Program of Immunization was beneficial for the reduction of HBV incidence in the populations of many participating countries. It is further postulated that HCC incidence in the world was also reduced at least in the portion caused by hepatitis B virus. Persistence of anti-HBV immunity was first measured by quantitative anti-HBs assay determined at 1 month post vaccination cycle, and then at different time points, even up to 12-15 years. The frontier of 10 IU/L (mIU/ml) is a mark of sustained immunity. However, cellular immunity studies revealed that this kind of response is very important in the defense against the virus and may last longer than the detectable antibodies. It was shown that 'full' surface vaccines, i.e. preS+S, may give stronger immunity and are good even for neonates. The next generation vaccines are DNA-based and plant-based HBV vaccines. This last category raises many hopes and with sufficient immunogenicity could ensure the most comfortable route of administration.

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Background: Hepatitis B is a major health problem in India. To prevent transmission and progression of the disease in the community, proper community awareness about the disease, including prevention, is necessary. Our objective was to study the awareness amongst the general population about hepatitis B virus, including knowledge regarding vaccine. Materials and Methods: The study was conducted in Department of Gastroenterology of SCB Medical College. The patients attending the OPD and their attendants were subjected to a questionnaire about different aspects of hepatitis B. Binary logistic regression analysis (SPSS 16) was employed to assess the statistical importance of the observations. Results: In all, 682 individuals (65% patients, 35% non-patients) were studied; 78% were males while 22% were females. Majority were in the age group of 31-40 years. 65% hailed from rural area; 65% were poor. About half of the subjects attended state run medical centers for medical attention; only 17% preferred medical colleges. Awareness about the disease and the vaccine among the subjects was 38% and 32%, respectively. 50% of those who were aware had no knowledge about route of transmission, infectivity, or importance of vaccination. Educated individuals were more aware about hepatitis B vaccine (P < 0.05). Those who read newspaper and listened to radio were more aware about hepatitis B (P < 0.05), and its vaccine (P < 0.05). The percentage of vaccination was 20% among study subjects, but in 30%, their children were vaccinated. The common reason for non-vaccination was lack of awareness (50%); of them, 60% blamed government/doctors/media for their ignorance. Majority (56%) received the vaccine from government hospitals or health centers. Only (10%) obtained vaccination from private centers. Reasons cited for non-vaccination included ignorance (50%), carelessness (12%), high cost (10%), and nonavailability (6%). Source of information regarding hepatitis B included television (75%), newspapers (55%), and radio (26%). Conclusions: Only about one-third of the population in coastal Eastern India are aware about hepatitis B and its vaccine. Less than a third of the population are vaccinated for hepatitis B. The educated, especially those who read newspapers and listened to radio, were more aware about the disease/vaccine. The government health agencies and physicians should work together to educate the masses about hepatitis B and its vaccine.

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In the nineties, lamivudine (LMV) was the first nucleoside analog to be marketed for the treatment of patients with chronic hepatitis B virus (HBV). Following the advent of LMV, the management of patients with chronic hepatitis B, particularly those with advanced liver disease was markedly improved, with a substantial reduction in the rates of liver-related complications and mortality. In the face of excellent safety profile records of the drug, hepatologists had to face for the first time the issue of high rates of HBV resistance to therapy as the result of years of treatment of large cohorts of patients in the West and East. Initially considered no more than a virological problem, LMV resistance was later recognized to be a relevant clinical issue whose management requires specific therapeutic strategies. New, more active oral analogs have been marketed since, and new agents are to appear in the market scenario in the near future; however, LMV is still the number one prescribed anti-HBV agent worldwide for the treatment of chronic HBV patients, due to its limited cost, excellent safety and well predicted resistance profile.

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Delta hepatitis or hepatitis D leads to acute and chronic liver disease in humans. The causative agent, the hepatitis delta virus (HDV), is a defective virus which leads to hepatitis in humans in the presence of the hepatitis B virus. This helper function of HBV is required for transmission and propagation of HDV infection but not for replication. HDV RNA replication occurs through the double-rolling circle model and does not possess a reverse transcription step. Hepatitis D-induced liver disease is immune-mediated and occurs either as co-infection of both viruses or as superinfection of a hepatitis B carrier with hepatitis D. Based on a sequence variation of 19-38%, to date seven genotypes of HDV have been described. HDV infection has declined significantly in many endemic areas in the last decades, however, due to migration to industrialized countries, this decline appears to have reached a plateau in western countries. The clinical course of delta hepatitis in general is associated with rapid progression. Delta hepatitis may be an additional risk factor for the development of hepatocellular carcinoma. The only established management for delta hepatitis consists of treatment with interferon for a period of at least one year. For those unresponsive to interferon treatment and patients with advanced disease new therapies are an urgent need. Such therapies may be on the horizon but translation of bench work to clinical practice is required.

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Hepatitis B vaccine can induce transient hepatitis B surface antigen positivity not only in adult hemodialysis patients but also in normal adults and children. Hence hepatitis B vaccinees may be mistaken for confirmed hepatitis B surface antigen-positive carrier. Hence blood donors should not donate blood in this early post-vaccination period and renal dialysis patients should not be screened for hepatitis B surface antigen for at least 21 to 28 days after hepatitis B vaccination. These guidelines could prevent individuals in the early post-inoculation period from being erroneously labeled as having hepatitis B viral infection.

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Malnutrition is prevalent in all forms of liver diseases. A number of factors contribute to malnutrition in patients with hepatic failure. Early diagnosis of malnutrition is essential to allow appropriate treatment, since malnutrition is an important predictor of complications of liver disease and mortality. Disease-specific nutritional therapy should be considered for acute liver failure, sepsis, transplantation, and encephalopathy. This article provides an overview of the nutritional management of acute and chronic liver disease and discusses the need for further intervention studies before appropriate rational treatment guidelines can be formulated.

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Approximately 400 million people worldwide are chronically infected with the hepatitis B virus (HBV). Chronic infection with HBV can lead to progressive liver diseases including cirrhosis, liver failure, and hepatocellular carcinoma. During treatment of chronic hepatitis B (CHB) patients, flares of inflammatory activity are a well known phenomenon. Flares can be life threatening but have also been associated with virological response. While, interferon induced flares have been attributed to the stimulatory effect of IFN, and may precede HBeAg seroconversion, Lamivudine related flares are seen during treatment and after withdrawal of lamivudine, which are probably caused by reoccurrence of HBV replication, and have been associated with decompensation of liver disease. These flares play an important role in the treatment with Peg-IFN α-2b alone or in combination with lamivudine, and patients with pre-existing cirrhosis are at greater risk for experiencing a flare. Furthermore, host induced flares but not virus induced flares may herald a response to therapy. For optimisation of treatment, it is necessary to understand the virological and immunological mechanisms which induce the specific flare patterns. This article reviews the pathogenesis, significance and management of flares encountered during and after cessation of treatment of patients with chronic HBV infection.

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The literature on hepatitis B virus (HBV) in immunocompromised patients is heterogeneous and refers mainly to the pre-antivirals era. Today a rational approach to the problem of hepatitis B in these patients provides for: a) the evaluation of HBV markers and of liver condition in all subjects starting immunosuppressive therapies (baseline), b) the treatment with antivirals (therapy) of active carriers, c) the pre-emptive use of antivirals (prophylaxis) in inactive carriers, especially if they are undergoing immunosuppressive therapies judged to be at high risk, d) the biochemical and HBsAg monitoring (or universal prophylaxis, in case of high risk immunosuppression) in subjects with markers of previous contact with HBV (HBsAg-negative and antiHBc-positive), in order to prevent reverse seroconversion. Moreover it is suggested a strict adherence to the criteria of allocation based on the virological characteristics of both recipients and donors in the general setting of transplants, and in liver transplantation the universal prophylaxis with nucleos(t)ides analogues (frequently combined with specific anti-HBV immunoglobulins) in HBsAg-positive candidates and in HBsAg-negative recipients of antiHBc-positive grafts should be adopted.

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