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[Viral hepatitis: from A to G viruses].

Great advances has been achieved in the last 10 years in the study of acute and chronic viral hepatitis. The enigma of non-A non-B viral hepatitis was disclosed when C virus was identified and later when E virus was isolated. New viruses has been searched to explain non-A to non-E viral hepatitis, being reported recently G virus. Epidemiology and clinical aspects has been reviewed identifying unusual clinical forms: choletasic and relapsing hepatitis in HAV infection; escape mutants B virus hepatitis in HVB infection; and the silent evolution to chronicity in more than 70% of cases in HVC infection. Diagnostic techniques has been developed to asses serum antibodies and the virus itself. It is important to quantitate the viral particles in the serum before treatment. PCR technique has been used with good results. A and E virus do not remain in the host and permanent inmunity is obtained after infection is resolved. 10% of B and 80% of C viral hepatitis goes to chronicity. So far, the only drug used to treat chronic viral B, D and C hepatitis is interferon alfa, obtaining good response en 40%. Combinations with Rivabirin and increasing the dose, frequency and duration of interferon treatment are in study. lt is a recomendation to treat acute HCV infection with Interferon alfa to prevent chronicity. Vaccines against A and B virus are used, being included in childhood vaccination programs. No HVC vaccine has developed probably to constant virus mutancy. New chalenges are present in this field and in the identification of new hepatitis viruses.

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