Hepatitis E in Pregnancy and Chronic HEV
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Direct answer
Hepatitis E is an enteric viral hepatitis caused by the hepatitis E virus (HEV), an RNA virus. In pregnancy, especially in the third trimester, HEV infection carries a high risk of fulminant hepatic failure, mainly with genotype 1 and 2 infection. Chronic infection, usually with genotype 3, mostly affects immunosuppressed patients such as solid organ transplant recipients, and it is treated by reducing immunosuppression and, if needed, adding ribavirin.
What you must remember
- Genotypes: genotypes 1 and 2 infect humans only and cause waterborne epidemics, whereas genotypes 3 and 4 are zoonotic and linked to pigs, deer and undercooked meat.
- Pregnancy risk: fulminant hepatic failure, most often in the third trimester, with high maternal and foetal mortality.
- Acute diagnosis: anti-HEV IgM in serum, with HEV RNA detected by PCR in blood or stool.
- Chronic hepatitis E: HEV RNA persisting beyond three months, most often genotype 3.
- Chronic risk group: solid organ transplant recipients and other patients on heavy immunosuppression.
- First step in chronic HEV: reduction of immunosuppression, which may clear the virus on its own.
- Ribavirin caution: it is teratogenic, so it is avoided in pregnancy and women of reproductive age need reliable contraception during treatment.
Genotypes and the clinical pattern
A nulliparous woman at 36 weeks presents with jaundice and vomiting, and the examiner asks what the infection could be and why it matters. The answer depends on the genotype and on whether the host is immunocompetent. Each genotype group has a different reservoir, route and setting, as summarised below.
| Feature | Genotypes 1 and 2 | Genotypes 3 and 4 |
|---|---|---|
| Reservoir | Humans only | Pigs, deer and other animals |
| Transmission | Faecal-oral, contaminated water | Undercooked meat or offal |
| Typical setting | Epidemics in tropical, resource-limited areas | Sporadic cases in developed countries |
| Pregnancy | Fulminant failure with high mortality | Limited pregnancy data |
| Chronicity | Rare | Important in immunosuppressed patients |
Genotype 1 is the commonest genotype in India, so acute hepatitis E in a pregnant woman here should be treated as a high-risk emergency. Chronic disease is a concern mainly where genotype 3 meets immunosuppression, and the plan then shifts to drug reduction and antiviral therapy.
Management in pregnancy is supportive, with obstetric and hepatology review together and monitoring of coagulation, glucose and foetal status.
Where the exam tests hepatitis E
Examiners test whether you connect genotype, host status and drug safety to the correct action.
- Trap: treating acute HEV in pregnancy as a routine self-limiting illness Correct: the third trimester carries a risk of fulminant failure, so close hepatic and coagulation monitoring is needed.
- Trap: giving ribavirin to a pregnant woman with chronic HEV Correct: ribavirin is teratogenic, so immunosuppression is reduced first and contraception is ensured.
- Trap: assuming every hepatitis E case is zoonotic genotype 3 Correct: genotypes 1 and 2 drive human epidemics, and pregnancy disease is most often reported with them.
Frequently asked questions
Why is hepatitis E especially dangerous in pregnancy?
Hepatitis E in pregnancy carries a high risk of fulminant hepatic failure, mostly in the third trimester. Maternal and foetal mortality are both high, so monitoring for coagulopathy and encephalopathy is essential.
Which hepatitis E genotypes cause chronic infection?
Chronic hepatitis E is mainly caused by genotype 3 and occasionally genotype 4. It occurs mostly in immunosuppressed patients, such as solid organ transplant recipients, whereas genotype 1 and 2 infections are usually acute and self-limiting in non-pregnant adults.
What is the first step in treating chronic hepatitis E?
The first step in treating chronic hepatitis E is reducing immunosuppression, since this alone can clear the virus in some patients. If viraemia persists, ribavirin is the usual next step, given for a defined course under specialist supervision.
Why is ribavirin avoided in pregnancy?
Ribavirin is avoided in pregnancy because it is teratogenic. Women of reproductive age who take ribavirin for hepatitis E need reliable contraception during treatment and for a defined period afterwards.