Window Period:
Occurs when the acute HBV virus is transitioning from acute to resolved
1. HBV infection begins
- HBsAG becomes detectable
- IgM anti–HBc becomes detectable
- HBV DNA is usually detectable
2. Acute infection progresses
- HBsAG eventually starts to disappear
3. Window period
- HBsAG has disappeared
- Anti–HBs hasn't appeared yet
- IgM anti–HBc remains positive
4. Recovery
- Anti–HBs appears
- IgM anti–HBc eventually disappears
- Total anti–HBc/ hep B core remains positive (often lifelong)