患者男，12岁。反复咳嗽2个月余，伴间断发热，多为低热。有两次咳嗽后吐出少许鲜血，混有白色痰液，无胸痛、气短、吼喘。査体：体重28kg,T37.50C,R20次/分，P80次/分，无贫血貌，肺部体征不明显，心（-)。胸片示右肺上叶渗出性改变。血常规：WBC9.0x109/L,N0.70,L0.30,Hb100g/L,RBC4.50x1012/L。尚需补充下面哪一项重要病史

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