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Kerri Alldis. Hepatitis Essay. October 2003. Hepatitis is a virus. Viruses are small infectious agents that reproduce only in living cells. They are obligate intracellular parasites, depending on the host cell for small molecules, energy and synthesis of macromolecules (especially synthesis of proteins). Viruses cannot replicate apart from living cells. Viruses are among the smallest infectious agents and much smaller than the cells they infect. Viruses consist of a nucleic acid core surrounded by a protein shell. A membrane envelope may also be present. Viruses are a major cause of human disease (Madigan. et al., 2000). Hepatitis is a systemic disease primarily involving the liver (Brooks et al., 2001). There are six known hepatitis viruses. These are types A, B, C, D, E and G. Hepatitis A virus (HAV) is a picornavirus. It is a spherical particle that contains a linear single-stranded RNA genome. Infectious hepatitis A is a virus-mediated inflammation of the liver,...

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