Hepatitis A – Causes, Symptoms and Treatment
Hepatitis A is a liver infection caused by the hepatitis A virus (HAV), typically spread through contaminated food or water, and in most cases resolves completely without becoming chronic.
Wissenswertes über "Hepatitis A"
Hepatitis A is a liver infection caused by the hepatitis A virus (HAV), typically spread through contaminated food or water, and in most cases resolves completely without becoming chronic.
What is Hepatitis A?
Hepatitis A is an acute inflammation of the liver caused by the hepatitis A virus (HAV). Unlike hepatitis B or C, hepatitis A almost always runs an acute course and heals completely in the vast majority of cases, without progressing to a chronic condition. Globally, it is one of the most common vaccine-preventable infectious diseases.
Causes and Transmission
The hepatitis A virus is primarily transmitted via the fecal-oral route, meaning the virus is shed in the stool of infected individuals and ingested by others through contaminated food, water, or direct contact.
- Contaminated food and water: Raw or undercooked shellfish, raw vegetables, and unsafe drinking water are common sources of infection.
- Direct person-to-person contact: Close contact with an infected person, especially in households or communal settings.
- Travel to high-risk regions: Areas with poor sanitation in parts of Africa, Asia, Central and South America pose a higher risk of infection.
Symptoms
The incubation period is typically between 15 and 50 days. Many infected individuals, especially young children, experience no or only mild symptoms. Adults tend to have more pronounced illness.
- Fatigue and general malaise
- Nausea, vomiting, and loss of appetite
- Abdominal pain, particularly in the upper right area
- Jaundice (icterus): Yellowing of the skin and eyes due to elevated bilirubin levels
- Dark urine and pale stools
- Fever and joint pain
The illness usually lasts several weeks to a few months. Severe or fulminant courses are rare but may occur in older patients or those with pre-existing liver conditions.
Diagnosis
Diagnosis is based on clinical symptoms and confirmed through blood tests that detect specific antibodies against the hepatitis A virus:
- Anti-HAV IgM: Indicates an acute or recent infection.
- Anti-HAV IgG: Indicates past infection or immunity from vaccination.
- Elevated liver enzymes (ALT, AST) and increased bilirubin levels are typical laboratory findings.
Treatment
There is no specific antiviral treatment for hepatitis A. Management is therefore supportive and symptomatic:
- Physical rest and adequate recovery time
- Sufficient fluid intake to prevent dehydration
- Avoidance of alcohol and liver-toxic substances or medications
- Hospitalization may be required in severe cases
Prevention and Vaccination
The most effective way to prevent hepatitis A is through vaccination. Highly effective vaccines are available and provide long-lasting, likely lifelong protection after two doses. Vaccination is particularly recommended for travelers to high-risk regions, individuals with chronic liver disease, and certain occupational groups.
General hygiene measures also help prevent infection:
- Thorough handwashing with soap after using the toilet and before preparing food
- Drinking safe, treated water when traveling
- Avoiding raw or undercooked seafood in high-risk areas
References
- World Health Organization (WHO): Hepatitis A – Fact Sheet. Available at: https://www.who.int/news-room/fact-sheets/detail/hepatitis-a (accessed 2024)
- Centers for Disease Control and Prevention (CDC): Hepatitis A – Information for the Public. Available at: https://www.cdc.gov/hepatitis/hav (accessed 2024)
- European Association for the Study of the Liver (EASL): EASL Clinical Practice Guidelines on hepatitis A virus infection. Journal of Hepatology, 2017.
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Related search terms: Hepatitis A + Hepatitis-A + HAV