Clinical Findings (2) characteristic a acute: severe, self-limited(4-6w) seldom relapse b chronic: less severe, ofter relapse longterm 3. else: anemia(severe bleeding) mild splenomegalyClinical Findings （2）characteristic： a. acute：severe、self-limited (4-6w） seldom relapse b. chronic：less severe、ofter relapse longterm 3. else：anemia (severe bleeding) mild splenomegaly