Some viruses can enter cells by first attaching to the cell membrane. The flu virus targets and attaches to the cells of the nose and mouth. The hepatitis virus targets only specific cells of the liver. state one way the immune system reacts when one of these viruses enters the body ?
HAV is transmitted primarily through the ingestion of water and food, and food contaminated by human feces, and reaches the liver - its targeted organ - through the bloodstream.
