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一、病毒性肝炎概述病毒性肝炎病原学上分甲型、乙型和非甲非乙型。部分乙型和非甲非乙型肝炎病人，可演变为慢性。临床分型：①急性肝炎（急性黄疸型，急性无黄疸型），②慢性肝炎（慢性迁延性，慢性活动性，慢性重型），③重症肝炎（急性重型，亚急性重型）。急性肝炎转变为慢性肝炎的确切发生率尚班确的数字，因为不同的调查者选择观察的对象、随访时间、随访的方法、诊断标准以测预后的估计等悬殊很大。中山医学院从临床及流行病学的观察初步认为肝炎由急性转变为慢性者为10～15％。其转变机理，推测主要与免疫反应异常及持续性病毒感染有密切关系。
First, an overview of viral hepatitis Viral pathogenic hepatitis A, B and non-B non-B type. Part B and non-A non-B hepatitis patients can evolve into chronic. Clinical classification: ① acute hepatitis (acute jaundice, acute jaundice), ② chronic hepatitis (chronic persistent, chronic active, chronic heavy), ③ severe hepatitis (acute severe, subacute heavy). The exact incidence of acute hepatitis to chronic hepatitis is still high, as different investigators choose subjects to be observed, the duration of follow-up, the methods of follow-up, and the diagnostic criteria to estimate the prognosis. Zhongshan Medical College from the clinical and epidemiological observations initially that hepatitis from acute to chronic were 10 to 15%. Its mechanism of change, speculated mainly with abnormal immune response and persistent virus infection are closely related.