Hepatitis E Virus
Hepatitis A gets the headlines; hepatitis E is the quieter cousin that’s been spreading through pork supply chains largely unnoticed. Genotypes 3 and 4 are zoonotic — pigs carry them, and undercooked pork and game bring them to the table.
Taxonomy & characteristics
- Hepatitis E virus (family Hepeviridae); non-enveloped RNA virus. Genotypes 1–2 are human-only (waterborne, developing regions); genotypes 3–4 are zoonotic (pigs, wild boar, deer) and foodborne in developed countries.
- Survives in the environment; moderately heat-resistant — thorough cooking inactivates it, light cooking may not.
- Illness: usually self-limiting hepatitis; but dangerous in pregnancy (genotype 1, high mortality) and can become chronic in immunocompromised patients (genotype 3).
Sources & high-risk foods
- Reservoir: pigs and wild boar (genotype 3), contaminated water (genotypes 1–2).
- High-risk: undercooked pork, pork liver and liver sausages (figatellu-type products have been outbreak vehicles), wild boar and deer meat, shellfish from contaminated waters.
Control measures
- Cook pork and game thoroughly — pink pork liver is the specific risk to eliminate.
- Slaughter hygiene to reduce carcass contamination; safe water in endemic regions.
- Blood-donor screening exists in some countries — a reminder this virus moves through more routes than food.
The pork connection
The hepatitis E story in developed countries was cracked by epidemiology: locally acquired cases with no travel history clustered around pork products, and viral sequences from patients matched those in pigs. Pork liver sausages — particularly raw or undercooked traditional products like figatellu in France — emerged as the highest-risk vehicle. This shifted hepatitis E from a ‘travel disease’ to a domestic food safety issue and prompted blood-donor screening in several countries (transfusion is another route). For pork processors, the control is the same unglamorous one as always: thorough cooking, validated for the thickest product. For consumers who enjoy traditional raw pork products, the risk is real and worth knowing about.