Related Experiment Videos
Search for hepatitis B virus DNA in sera from patients with acute type B or non-A, non-B hepatitis
Insights
Hepatitis B virus DNA (HBV DNA) was not detected in most non-A, non-B hepatitis cases. In type B hepatitis, HBV DNA presence varied by disease severity and serologic markers, with clearance often linked to HBsAg disappearance and anti-HBs appearance.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- Acute hepatitis B and non-A, non-B hepatitis are significant public health concerns.
- Distinguishing between hepatitis types and understanding viral replication dynamics are crucial for patient management.
Purpose of the Study:
- To investigate the presence and significance of hepatitis B virus DNA (HBV DNA) in acute hepatitis B and non-A, non-B hepatitis.
- To correlate HBV DNA detection with clinical presentation (benign vs. fulminant) and serologic markers.
Main Methods:
- Serum samples from 103 adults with acute hepatitis were tested for HBV DNA using a [32P]HBV DNA probe.
- Patients were categorized based on hepatitis type (B or non-A, non-B), clinical course (benign or fulminant), and serologic markers (HBsAg, IgM anti-HBc, anti-HBs, HBeAg).
Main Results:
- HBV DNA was detected in 38.5% of benign and 34.6% of fulminant HBsAg-positive hepatitis B cases.
- HBV DNA was not detected in acute HBsAg-negative hepatitis B cases or in any non-A, non-B hepatitis cases.
- Absence of detectable HBV DNA in some HBsAg and HBeAg positive patients may indicate low-level replication or delayed HBeAg clearance.
- Anti-HBs emergence with HBsAg presence did not consistently indicate HBV clearance in fulminant cases.
Conclusions:
- HBV DNA detection is specific to hepatitis B infection and its presence correlates with viral replication.
- In acute hepatitis B, the clearance of HBV DNA is typically associated with the disappearance of HBsAg and the appearance of anti-HBs, irrespective of disease severity.
- Further investigation is needed to understand HBV DNA detectability in certain HBsAg/HBeAg positive cases.
Abstract:
One hundred and three single sera from adults hospitalized with acute type B (78) or non-A, non-B (25) hepatitis were tested for the presence of hepatitis B virus DNA (HBV DNA). All sera from patients with type B hepatitis were IgM anti-HBc-positive. These patients were classified as benign (47) or fulminant (31) hepatitis. The 25 acute non-A, non-B patients were also classified as benign (21) or fulminant (4) hepatitis and were negative for serologic markers of past HBV infection. Serum HBV DNA was detected with similar frequency in benign (38.5%) and fulminant (FH, 34.6%) HBsAg-positive cases. HBV DNA was not detected in either the 26 acute HBsAg-negative hepatitis B cases who were positive for anti-HBc and anti-HBs or the 25 acute non-A, non-B hepatitis cases. The absence of HBV DNA in 43.8% of benign hepatitis B patients who were positive for HBsAg and HBeAg could possibly be attributed to either low level replication of HBV that was not detectable by the [32P]HBV DNA probe or to a period of delayed clearance of free HBeAg following cessation of HBV replication. Emergence of anti-HBs in the presence of HBsAg did not always correspond to clearance of HBV in fulminant type B cases. However, in acute type B hepatitis, irrespectively of severity, disappearance of HBsAg and appearance of anti-HBs was accompanied by reduction of HBV replication to undetectable levels.