Hepatitis A Virus (HAV)

The hepatitis A virus (HAV) is a small virus that primarily targets the liver, causing an inflammation called hepatitis. Highly resistant in the environment, it can survive for a long time on surfaces or in water, which facilitates its transmission. After infection, some people show no symptoms, but others develop fatigue, fever, loss of appetite, nausea, abdominal pain, and jaundice (yellowing of the skin and eyes). Fortunately, the disease is generally acute and temporary, with no chronic progression.

HAV is mainly transmitted by the fecal-oral route, through the ingestion of contaminated water or food or through close contact with an infected person. Once in the body, it multiplies in the liver, and the body eventually eliminates it naturally. There is no specific treatment, but rest and good hydration allow for complete recovery in a few weeks.

Structurally, HAV clearly differs from hepatitis B and C viruses. It is an unenveloped virus, with a highly resistant protein shell, which explains its long survival in the environment. In contrast, hepatitis B virus (HBV) and hepatitis C virus (HCV) have a lipid envelope, which is more fragile outside the body but essential for infecting cells. Furthermore, HAV contains an RNA genome, while HBV is a DNA virus (which is quite rare among hepatic viruses), and HCV is also an RNA virus but with a different structure and high genetic variability. These differences partly explain their modes of transmission, their resistance, and their ability (or lack thereof) to cause chronic infections.

Prevention relies on simple actions: washing hands, consuming safe drinking water, proper food handling, and especially vaccination, which offers excellent protection against HAV.

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PUN : I'm so he-petite !