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R Stute

Publications and source records attributed to R Stute.

11 recordsLinked to original sources
PubMed1989

[HIV infection in stage IV C-2 (CDC). Increase in the p24 antigen value before critical decrease in CD4+ lymphocytes].

The Center for Disease Control proposed a classification system of HIV-infection including a symptomatic stage IV C-2 with secondary infections like thrush, oral hairy leukoplakia and herpes zoster. Because the prognostic value of these symptoms for the development of AIDS has been proven and the CDC-classification does not include any immunological parameters we analyzed the numbers of CD4+-lymphocytes and the frequency of HIV-antigen in 65 HIV-infected individuals. When entering stage IV C-2, the incidence of HIV-antigenemia was as high as in full blown AIDS (53% and 60%, respectively). However, we observed no decrease of CD4+-lymphocytes as compared to earlier CDC-stages.--We conclude that in stage IV C-2 the increase of viral protein production proceeds independently from CD4+-status.

CD4 Antigens↗
PubMed1988

[Diagnostic value of the determination of HIV antigen in enzyme immunoassay].

Enzyme-immunoassays (EIA) for HIV antigen and antibodies were performed on 33,076 serum samples during an 11-month period. Prospective analysis involved samples from 21,496 blood donors, 11,086 samples sent in as coming from "high-risk" persons and 101 samples from AIDS patients, while retrospectively samples from 393 high-risk persons, including a group of homosexuals from New York, were tested. No HIV antigen was found among blood donors, although during the test period seroconversion of one blood donor had been noted. Among 297 persons infected with HIV, 82 sera were positive for HIV antigen, always in combination with HIV antibodies: there was no case positive for HIV antigen but negative for HIV antibodies. The results suggests that at present it is not necessary routinely to test blood donors for HIV antigen by EIA.

Acquired Immunodeficiency Syndrome↗
PubMed1988

Comparison in sensitivity of 10 HIV antibody detection tests by serial dilutions of Western blot-confirmed samples.

Nine ELISA tests and one particle agglutination test for the detection of HIV antibodies were analysed using serial dilutions of Western blot-confirmed positive serum samples. These samples were diluted in HIV antibody negative human serum in a range of 1:10 to 1:10,000 or 1:100,000. Remarkable differences in sensitivity were observed. Some tests were 10- to 100-fold more sensitive than others, and even differences of 1000-fold were detected.

Agglutination Tests↗
PubMed1985

Absence of detectable hepatitis B virus DNA in sera and liver of chimpanzees with non-A, non-B hepatitis.

The risk of hepatitis B infections has been reduced by screening of blood donors for hepatitis B surface antigen (HBsAg). However, recipients remain at significant risk of developing post-transfusion hepatitis. Studies have shown that non-A, non-B hepatitis virus(es) are responsible for the majority of post-transfusion hepatitis infections. In spite of many efforts, these non-A, non-B hepatitis viruses have not yet been identified. Epidemiological studies, however, suggest that non-A, non-B hepatitis shares many features with hepatitis B. Recently, Wands et al [1982] showed, in chimpanzees infected with non-A, non-B hepatitis agents, the presence of antigenemia or viremia by radioimmunoassay with monoclonal antibodies directed toward distinct determinants of HBsAg and by molecular hybridization analysis. They suggested that non-A, non-B hepatitis agents may be related, but distinct variant(s) of hepatitis B virus (HBV). In this study, five chimpanzees were inoculated with three different agents that have been shown to transmit non-A, non-B hepatitis. The following inocula were used (I) a factor VIII preparation kindly provided by D.W. Bradley, (II) acute phase serum from a chimpanzee infected with the F strain kindly provided by A.J. Zuckerman, and (III) a DS-antigen serum previously shown by us to transmit non-A, non-B hepatitis [Duermeyer et al, 1983]. All chimpanzees developed a rise in transaminase levels between 8 and 10 weeks after inoculation. None of the chimpanzees was positive for any markers of HBV infection. No evidence was obtained of infection with hepatitis A, cytomegalovirus, or Epstein-Barr virus. One chimpanzee developed chronic liver disease.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1985

Preliminary results of transmission experiments of non-A, non-B hepatitis by mononuclear leucocytes from a chronic patient.

Mononuclear leucocytes (mainly lymphocytes), isolated by Ficoll-Paque gradient centrifugation of blood freshly drawn from a haemophilia A patient with chronic non-A, non-B hepatitis (NANB), caused NANB when infused in a susceptible chimpanzee. Plasma from the same patient also transmitted the disease, as witnessed by elevated levels of liver enzymes in serum, histopathological signs of viral hepatitis and submicroscopic cytoplasmic alterations in the hepatocytes, considered to be specific for NANB in chimpanzees. In contrast, neither lymphocytes nor plasma from a chimpanzee apparently fully recovered from two episodes of NANB had the same effect.

Adult↗
PubMed1979

Frequency of hepatitis B after open heart surgery: a retrospective study over a three-year period (1974--1976).

In spite of intensive efforts to reduce the risk of hepatitis B after heart operations, this complication is observed in 40 % or more of the cases. Over a period of three years (1974--1976) we examined 588 patients who had undergone open heart surgery. The following results were found: In 1974 the hepatitis frequency was 2.0 %, while in 1975 and 1976 it was 0.6 % hepatitis B and 0.6 % non-B hepatitis. We believe the reason for this improvement is a more careful selection of blood donors and their continuous control according to the following parameters: regular clinical observation; regular chest x-ray; determination of BSR, hemoglobin and aminotransferase; TPHA test; and search for antibodies. In 1974 hepatitis-B-surface-antigen (HBsAg) was detected by means of reverse hemagglutination tests. Since 1975 a modified radioimmunoassay has been used for this purpose. No donor blood with abnormal results was transfused, except for a very small number of extreme emergencies. The good results demonstrated can only be obtained by following the described program and by strictly avoiding pool preparations.

Alanine Transaminase↗
PubMed1979

[Complement-fixing antibodies to chlamydia in the population (author's transl)].

2,213 sera of normal persons and of men with nongonococcal urethritis were tested by CF. 4.5% of the males, 9.2% of the females, and 10.8% of the urethritis-patients had titers of 1 : greater than or equal to 16 when tested against a group-specific chlamydial antigen. The usefullness of the CFT for seroepidemiological studies was confirmed.

Adolescent↗