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Traveler Summary

Key Points

  • Hepatitis E is a viral infection occurring worldwide that is acquired through the consumption of fecally-contaminated water or raw or undercooked pork, pig livers, or wild game infected with the hepatitis E virus (HEV).
  • Risk is increased for travelers going to countries with poor sanitation and those who consume fecally contaminated water, food that has not been hygienically prepared, or inadequately cooked pork, wild game, or shellfish.
  • Symptoms include jaundice (yellow eyes and skin and dark urine), fever, influenza-like symptoms, and abdominal pain.
  • Consequences of infection rarely occur but can include pain and muscle weakness or acute liver failure.
  • Prevention includes observing standard food and beverage precautions and frequent, thorough handwashing.
  • No vaccine is available except in China.

Introduction

Hepatitis E, caused by HEV, is an infection of the liver occurring worldwide that is acquired through consumption of fecally-contaminated water or raw (or undercooked) pork or wild game. HEV infection causes acute hepatitis in healthy persons and can progress to chronic hepatitis in solid organ transplant recipients or persons with weakened immune systems. HEV is the leading cause of acute viral hepatitis in developing countries.

Risk Areas

HEV infections occur worldwide (particularly in areas with poor sanitation), with the highest incidence in Asia, Africa, the Middle East, and Central America. Large outbreaks, often associated with flooding or monsoon, have been reported in India, Nepal, China, Chad, Uganda, Sudan, and South Sudan. Outbreaks have also occurred in areas of conflict and humanitarian emergencies, such as war zones and refugee camps.

Transmission

HEV is predominantly transmitted through the consumption of fecally contaminated water, food (e.g., raw, undercooked, or inadequately cooked pork, pork liver, game [wild boar and possibly deer], or shellfish), or from mother to child during pregnancy. In rare cases, HEV transmission has been attributed to transfused blood or blood products.

Risk Factors

Risk is increased for travelers going to countries with poor sanitation who consume contaminated food.

Travelers going to or within Europe, the U.S., Japan, China, and possibly elsewhere are also at risk of HEV infection from eating raw or undercooked domestic pig or wild boar meat, especially liver, which is traditional in many cultures.

Pregnant women, persons with preexisting liver disease, persons with weakened immune systems, displaced persons (refugees), pig farmers, and hunters are also at increased risk.

Symptoms

Symptoms (if they do appear) develop about 15 to 60 days following exposure and include jaundice (yellow eyes and skin and dark urine), fever, influenza-like symptoms, abdominal pain, vomiting, weight loss, and aching muscles. However, most persons infected with HEV have mild symptoms or are symptom free.

Consequences of Infection

Serious illness rarely occurs, but complications can include neurological involvement (e.g., pain and muscle weakness or paralysis) and fulminant hepatitis (acute liver failure), especially during pregnancy, resulting in fetal loss and death. Death occurs in about 20% to 25% of pregnant women if they are infected during the third trimester.

Need for Medical Assistance

Travelers who develop symptoms of HEV infection during or a few weeks after travel should seek urgent medical attention (especially if the traveler is pregnant, has a weakened immune system, or a preexisting liver disease).

Most cases of HEV infection resolve spontaneously within a few weeks. Treatment is mainly supportive; ribavirin (antiviral) therapy is effective in cases of severe infections.

Prevention

Nonvaccine

Observe food and beverage precautions, frequent and thorough handwashing practices (especially after using the bathroom and before preparing or eating food) and avoid eating raw or inadequately cooked pork. See Food and Beverage Precautions.

Vaccine

A vaccine has been licensed in China but not elsewhere.