1、入院后患儿不规则发热持续10余天,体温波动在38~39.5℃,食减、乏力体查:面色苍白,睑结膜可见瘀斑,心脏杂音同前,肝肋下3cm,脾肋下1cm血常规:Hb70g/L,WBC42×109/L,N0.78,PCT87×109/L,尿常规:蛋白+,RBC2~5个/HP,wBC2~3个/HP 61.诊断考虑:( )