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Query: UMLS:C0019158 (hepatitis)
 30,205 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

There are two well-characterized antigen-antibody systems which relate specificially to viral hepatitis B. Tests for HBsAg and anti-HBs are readily available and of great benefit to the diagnosis, prevention and understanding of hepatitis B. Tests for HBcAg and anti-HBc are still research techniques which requires further development before they can be used at the level of everyday medical practice. HBsAg in an individual indicates that he harbors the virus of hepatitis B; it may be present in the absence of liver disease or be found in association with both acute and chronic type B hepatitis. The presence of HBsAg also suggests that HBV may be causally related to some cases of periarteritis nodosa, chronic glomerulonephritis, and hepatoma. Although HBV is readily transmitted in blood, the major portion of post-transfusion hepatitis now appears to be serologically unrelated to either the hepatitis B virus ("serum") or the hepatitis A virus ("infectious"); the etiology of these cases is currently undetermined. There is increasing evidence that HBV may be transmitted by modes other than blood, but the exact mechanisms of such transmission is not established. The combined transmission of HBV by blood and other routes has resulted in a large number of persistent carriers of HBsAg in the world. There is no current method to alter this carrier state. The hepatitis risk of such persistent carriers to their personal and professional contacts is under investigation.
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PMID:The clinical significance of hepatitis B virus antigens and antibodies. 4 64

Within the framework of a prospective study on the course and prognosis of ulcerative colitis and Crohn's disease begun in 1968, serial blind needle biopsies of the liver were carried out for the early establishment of liver involvement. In 201 needle biopsies taken in 114 patients with ulcerative colitis, normal findings were observed in 51, fatty infiltration in 24, and accompanying inflammation in 23, fatty infiltration together with a mesenchymal reaction in 8, fatty liver in 6 and sclerosing cholangitis and granulomatous hepatitis in 1 patient each. Of 69 needle biopsies taken in 45 patients with Crohn's disease we established normal findings in 13, an insignificant accompanying inflammation in 19, fatty infiltration in 5, granulomatous hepatitis in 3, fatty liver in 2, fatty liver together with a mesenchymal reaction in 2 and serum hepatitis in 1. Laboratory tests (alkaline phosphatase, SGOT, SGPT, BSP excretion) are not particularly suitable as screening tests. The diagnostic yield of serial blind needle biopsies of the liver is low and, despite the low-risk nature of the method, often dispensable. Laparoscopy, or at least blind needle biopsy of the liver, should be retained for the further clarification of serious deviations of laboratory values from the normal range, or of suspicious palpation findings.
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PMID:[Hepatic reaction in ulcerative colitis and Crohn's disease (author's transl)]. 4 40

Tissue sections from 42 specimens of liver were examined by indirect immunofluorescence microscopy for the presence of hepatitis B antigen (HB Ag). In all cases the serologic status of HB Ag was known. Fourteen of the specimens were also examined by electron microscopy. In four biopsies from three patients positive cytoplasmic fluorescence was detected using antisera prepared in animals and 20-nm. nuclear particles were found by electron microscopy. These patients were all seropositive for HB Ag, all had chronic aggressive hepatitis or active cirrhosis, and all were receiving immunosuppressive therapy at the time of examination. Nuclear fluorescent staining was demonstrated when one of these biopsies was re-examined using a human antiserum.
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PMID:The detection of hepatitis B antigen in hepatic parenchyma by the fluorescent antibody technic. 5 Jul 31

One hundred and ninety hepatitis B surface antigen positive (HBsAG+) sera were subtyped, belonging to : blood donors, hepatitis patients, patients and staff in a hemodialysis unit, all from Kuala Lumpur; Malaysian aborigines from three jungle locations in Peninsular Malaysia; and East Malaysians from Sarawak, East Malaysia; Three subtypes adr, adw and ayw were present in Malaysia in the following frequencies: 44%, 29%, and 27%, respectively; In Kuala Lumpur 87% had subdeterminant d and 13 per cent y, whereas in the deep jungle aborigines of Perak and Pahang, the y subdeterminant was present in 87% and the d in 13%. A similar pattern of preponderance of y prevailed in Sarawak, East Malaysia. In Kuala Lumpur the two main ethnic groups, Malays and Chinese, differed in subtype distribution, in that adr predominated in the Malays (61%), while the adw predominated in the Chinese (51%); Subtype distribution was not related to age or sex of carriers of the antigen, or to whether they had hepatitis, or asymptomatic antigenemia.
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PMID:Hepatitis B surface antigen subtypes in Malaysia. 5 Jul 35

Thirteen patients with polymyalgia rheumatica (P.M.R.) were examined for evidence of viral infection. Hepatitis-B surface antibody (HBsAb) was detected in nine out of twelve patients tested prior to therapy. The antibody persisted up to six months in four patients but reverted to negative in the other five. HBsAb was found in only one of twelve age-matched controls. Hepatitis-B surface antigen was not detected in any patient or control. No significant elevation of antibody titre was detected to a panel of twelve other organisms. Immunoglobulin levels were elevated prior to treatment in several patients. With steroid therapy the IgG and IgA levels fell serially but the IgM levels increased in six patients. These results suggest that hepatitis B is an important trigger for P.M.R. In view of the association with giant-cell arteritis, P.M.R. may represent an abnormal immunological response to infection in elderly patients.
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PMID:Hepatitis-B antibody in polymyalgia Rheumatica. 5 Dec 86

An outbreak of jaundice associated with three out of four batches of a commercial brand of freeze-dried factor-VIII concentrate occurred at the Bournemouth haemophilia centre between April and June, 1974. Seven cases of non-B hepatitis and four of hepatitis B occurred within 6 months of the first use of this product. Two patients contracted both types of hepatitis; thus nine patients became ill out of a total of twenty regularly seen at the centre, eighteen of whom received commercial factor-VIII concentrate.
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PMID:An outbreak of hepatitis associated with intravenous injection of factor-VIII concentrate. 5 75

The close association between hepatitis B antigen (HBAg) and the infectious agent of hepatitis B is clear. Many investigations have shown HBAg to be a useful tool for epidemiological studies of hepatitis B. The relation between HBAg and the postulated hepatitis B virus (HBV) is as yet not clear. In light of recent results a possible candidate could be the so-called Dane particle, which has HBAg reactivity on the surface, but possesses an antigenically distinct core. The core has been shown to have associated DNA polymerase activity. The particles which carry HBAg reactivity have surfaces which are antigenically complex. One common specificity a and 2 pairs of mutually exclusive determinants have been recognized namely d and y and w and r but further possible specificities are under investigation. Four different phenotypes have been described, adw, adr, ayw and ayr. Present evidence indicates that adw, adr and ayw are the phenotypic expression of 3 different transmissible strains of HBV. Studies on the epidemiology of these subtypes have shown 3 different geographic patterns. In the USA and Northern Europe both Dw (adw) and YW (ayw) are common, but in the Eastern Mediterranean and Middle East Yw is practically the only type found. In the Far East DR (adr) is the dominating subtype. Investigations have been done to determine whether there are any clinical differences in hepatitis caused by the different tubtypes. No certain differences have been shown.
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PMID:Some epidemiological and clinical aspects of hepatitis B antigen and its subtypes. 5 89

Immunofluorescent and electron microscopic methods allow the localization of hepatitis virus B-components at the cytologic and histologic level. The acute and chronic forms of viral hepatitis are re-evaluated in the light of these new findings. In HB-Ag-positive hepatitis four types of correlation between the expression pattern of HG-Ag components and different forms of hepatitis are recognized which are of diagnostic and prognostic relevance (elimination type, immunosuppression type, aggression type, and carrier type). The correlation between antigen expression, persistence of infection and type of inflammation seems to reflect the specific immune state towards the hepatitis B virus.
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PMID:[Morphological characteristics and pattern of hepatitis B antigen expression in liver tissue in acute and chronic forms of hepatitis (author's transl)]. 5 91

Between January 1970 and December 1974, 122 cases of acute type B hepatitis were subtyped; 66 (54%) were of the ad type and 56 (46%) were of the ay type. "Cluster" cases (from a dialysis unit) were not considered. During the first period, subtype ad predominated, whereas in the second year there was a clear predominance of the ay subtype; the difference was statistically significant (P less than 0.02). In yearly periods the differences were significant between the years 1970 and 1974 (P less than 0.05), 1972 and 1974 (P less than 0.05), and 1972 and 1973 (P less than 0.05). If only patients without parenteral exposure are considered, there was clearly a shift between 1970-1972 and 1973-1974 in favor of the ay subtype (P less than 0.01). Since epidemiological factors such as injections and transfusions seem not to be responsible, it is suggested that a change of virus strain may be responsible for the different distribution of subtypes of hepatitis B surface antigen in the last year.
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PMID:Change of hepatitis B surface antigen in patients with hepatitis during a five-year period. 5 83

Hepatitis B surface antigens specified by the genome of the hepatitis B virus are shared by various particulate forms which circulate in the sera of chronic HBs Ag carriers. As purified from sera, HBs Ag consists of at least seven polypeptides, two of which appear to be glycoproteins. Most or all of these polypeptides contain both group-specific (a) and subtype-specific (d or y) determinants aspart of their structure. One particulate form, the Dane particle, is present as a minor component in most sera and may actually represent the virus of type B hepatitis.
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PMID:Biophysical and biochemical characterization of hepatitis B antigen. 5 4


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