Chronic Hepatitis Takes Hold
Persistent HBV or HCV infection quietly damages the liver for years.
- ~254M: People with chronic HBV (globally, WHO 2022)
- ~50M: People with chronic HCV (globally, WHO 2022)
- 90%: HBV → chronic infection risk (if infected at birth)
- 1.1M/yr: Liver deaths from viral hepatitis (cirrhosis + cancer)
What chronic infection means
Virus persists past six months without clearance.
Silent early course
Most patients feel no symptoms for years.
Cirrhosis risk starts accumulating long before symptoms appear.
Why stratify risk
Early risk estimates guide antiviral treatment urgency.
Measuring HBV DNA / HCV RNA
Higher circulating viral load predicts faster liver injury.
- 2,000 IU/mL: HBV DNA cirrhosis threshold (REVEAL-HBV study)
- >1M IU/mL: High-risk HBV DNA (strongest predictor)
- Lower: HCV RNA relevance (duration matters more)
- PCR assay: Test used (quantitative viral load)
Why viral load matters
More virus means more ongoing hepatocyte injury.
HBV vs HCV dynamics
HBV load tracks risk closely; HCV less directly.
REVEAL-HBV linked DNA >2,000 IU/mL to markedly higher cirrhosis risk.
Slider effect here
Raising viral load speeds the fibrosis fill rate.
Years of Ongoing Infection
Fibrosis accumulates gradually across decades of infection.
- 20–30 yrs: Median time to cirrhosis (untreated chronic HCV)
- ~10 yrs: Faster course with cofactors (alcohol + obesity present)
- F0–F4: Fibrosis stages (METAVIR scoring)
- Cirrhosis: F4 (end-stage fibrosis)
A slow-motion process
Scar tissue replaces healthy liver bit by bit.
Duration on the bar
The fibrosis bar climbs continuously with simulated years.
Longer untreated duration alone can push risk into the moderate band.
Why timing matters
Earlier antiviral therapy shortens exposure time.
Alcohol and Obesity Add Injury
Alcohol and obesity multiply liver damage beyond the virus alone.
- ~3×: Alcohol + HCV cirrhosis risk (vs virus alone)
- ~30%: Obesity prevalence, chronic HBV/HCV (adds steatosis)
- None known: Safe alcohol threshold (in chronic hepatitis)
- Common: NAFLD overlap (accelerates fibrosis)
Additive injury
Fat and alcohol droplets strike the liver alongside virions.
Why it compounds
Steatosis and oxidative stress worsen viral inflammation.
Cofactor burden raises the fibrosis fill rate on top of viral load.
Modifiable risk
Cutting alcohol and weight loss meaningfully lower risk.
Combined Cirrhosis Risk
Viral load, duration, and cofactors combine into one risk gauge.
- <33%: Low risk band (routine monitoring)
- 33–66%: Moderate risk band (closer surveillance)
- >66%: High risk band (treat and screen for HCC)
- ~2–4%/yr: Cirrhosis → HCC risk (once cirrhotic)
Reading the gauge
Needle position reflects the combined risk score.
Threshold bands
Color zones mark low, moderate, and high categories.
Once fibrosis nears full, risk climbs steeply into the high band.
Clinical use
Risk band guides biopsy, imaging, and treatment decisions.