## Hepatitis A Transmission **Key Point:** Hepatitis A virus (HAV) is transmitted exclusively through the fecal-oral route, making it the most common mode of transmission worldwide, particularly in areas with poor sanitation. ### Epidemiological Features **High-Yield:** HAV transmission occurs via: - Contaminated water supplies (most common in endemic areas) - Contaminated food (shellfish, uncooked vegetables) - Close personal contact with infected individuals - Fecal contamination of hands in healthcare settings ### Clinical Context in India **Clinical Pearl:** India is an endemic region for HAV. Acute hepatitis A typically presents with: - Prodromal symptoms (fever, malaise, anorexia) - Jaundice appearing 5–7 days after symptom onset - Anti-HAV IgM positivity indicating acute infection - Self-limited course with complete recovery in immunocompetent hosts ### Why Not Other Routes? | Route | Virus | Reason | |-------|-------|--------| | Fecal-oral | HAV, HEV | Primary transmission | | Percutaneous | HBV, HCV, HDV | Not HAV | | Sexual/Vertical | HBV, HCV | Not HAV | | Respiratory | None | Hepatitis viruses not airborne | **Warning:** HAV does NOT require percutaneous exposure; it is not transmitted by blood transfusion or sexual contact, distinguishing it from HBV and HCV. [cite:Harrison 21e Ch 297]
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