男孩，8个月，因高热6天伴皮疹来院。查体:发育正常，皮肤可见红色斑疹，右颈部淋巴结1.5cmx2cm,咽红，扁桃体I度肿大，口唇干红，双肺呼吸音清，心尖区可闻及2/6级收缩期杂音，腹软，肝、脾不大，四肢末端红肿。实验室检査：HblOOg/L,WBC13xlO9/L,N0.78,L0.22,PLT352x109/L,ESR70mm/h,CRP(+),ASO100U。下列哪项检查最有助于该患儿的确诊

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