Biomedical subjects

C Lecot

Publications and source records attributed to C Lecot.

4 recordsLinked to original sources

PubMed1993

Polymerase chain reaction-based detection of hepatitis D virus genome in patients infected with human immunodeficiency virus.

The polymerase chain reaction (PCR) was used to detect hepatitis D (HD) viremia in patients infected with the human immunodeficiency virus (HIV). Nineteen (9%) of 206 such patients, unselected for liver disease or HBV infection, were found prospectively to be infected by HDV. Thirty-one anti-HIV-positive patients were studied by means of PCR, and the results were analyzed according to HDV and hepatitis B virus (HBV) serological status. HDV-PCR was positive in 5 patients. Two had detectable serum HDV antigen. Four patients had anti-HD IgM and IgG antibodies. All these patients were HBs antigen-positive, and 3 were HBV-DNA-positive. All the other patients were HDV-PCR-negative. Statistical analysis suggested more extensive liver damage and immunological impairment in HDV-PCR-positive patients. In this unselected HIV-infected population, HDV-RNA detection by PCR was restricted to HDV infected patients in whom 5/19 were positive. This test permitted direct diagnosis of HDV viremia and will be useful for monitoring HDV infection.

AIDS-Related Opportunistic Infections↗

PubMed1993

Polymerase chain reaction-based detection of hepatitis D virus RNA in patients infected with human immunodeficiency virus.

We used the polymerase chain reaction (PCR) to detect hepatitis D (HD) viremia in patients infected with the human immunodeficiency virus (HIV). Nineteen (9%) of 206 such patients were prospectively found to be infected by HDV. Thirty-one anti-HIV-positive patients were studied by means of PCR and the results were analysed according to HDV and hepatitis B virus (HBV) serological status. HDV-PCR was positive in five patients. Two had detectable serum HDV antigen. Four patients had anti-HD IgM and IgG antibodies. All these patients were HBs antigen-positive, and three were HBV-DNA positive. All the other patients were HDV-PCR-negative. Statistical analysis suggested more extensive liver damage and immunological impairement in HDV-PCR positive patients. In this unselected HIV-infected population, HDV-RNA detection by PCR was only evidenced in HDV infected patients in whom 5/19 were positive. This test allowed direct diagnosis of HDV viremia and will be useful for the monitoring of HDV infection.

AIDS-Related Opportunistic Infections↗

PubMed1992

[Hepatitis B].

Explore the source record for details and available documents.

Hepatitis B↗

PubMedDate not supplied

Polymerase-chain-reaction-based semi-quantification of hepatitis D viraemia in patients treated with high doses of alpha 2b interferon.

To study the antiviral efficacy of high doses of alpha 2b interferon (alpha 2b-IFN) for chronic hepatitis D treatment, we used polymerase-chain-reaction(PCR)-based semi-quantitative detection of HDV RNA. The semi-quantification method used was based on the appearance of a positive amplification signal as a function of the number of PCR cycles. By amplifying dilutions (10(-1)-10(-8)) of an HDV-positive woodchuck liver RNA, we confirmed that exponential amplification efficacy occurred at between 20 and 30 cycles. Positive signals were observed from dilution 10(-2) (gel electrophoresis after 20 cycles of PCR) to dilution 10(-7) (hybridization after 30 cycles of PCR). To characterize the HDV RNA level in sera of 8 patients treated with alpha 2b-IFN (10 MU/3 times a week) for 1 year, we extracted RNA from serum samples taken every 6 months. All samples were amplified in parallel for 20 and 30 PCR cycles. Analysis of HDV cDNA after ethidium bromide/agarose gel electrophoresis and after molecular hybridization (100 times more sensitive than gel analysis), enabled us to grade the signals observed from negative to positive as 1+, 2+, 3+ and 4+, with all results being positive. Three types of evolution of HDV viraemia were evidenced among the 8 treated patients. HDV replication continued to occur at a high level at the 6th and 12th month in 2 patient sera. For 2 other patients, an HDV RNA decrease or disappearance was evidenced in the serum at the 6th month; however, viral replication recurred at a higher level at the 12th month.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗