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当前学科：感染性疾病
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患儿男，7岁，发热1天，伴面颈部淡红色斑丘疹，并迅速延及躯干和四肢。查体发现耳后、枕后部淋巴结肿大。最可能的诊断是（）
A . A.麻疹
B . B.幼儿急疹
C . C.药物疹
D . D.风疹
E . E.猩红热
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