患儿男,4个月。因腹泻6天,发热4天,皮疹1天入院。入院前6天开始腹泻黄绿色水样便,4～6次/日。4天前开始发热,达38°～40℃之间,同时眼、唇发红。入院前2天,右侧颈部出现1枣样大小肿块,拒按。入院前1天出现全身散在片状红疹。于当地应用“青霉素”等治疗无效转来我院。个人史及既往史无特殊,病前体健。入院时查体:T38.4℃,P148次/分,R40次/分,体重:6.5kg。发育正常一营养中等,烦躁,全身皮肤弥漫性充血性粟粒样皮疹,压之褪色,以双大腿,臀部显著。右侧颈部触及一0.5×2cm不规则肿大淋巴结,轻度活动,压痛。心肺无异常发 Children male, 4 months. 6 days due to diarrhea, fever 4 days, 1 day admission rash. 6 days before admission to start diarrhea, yellow-green watery stool, 4 to 6 times / day. 4 days ago began to fever, up to 38 ° ~ 40 ℃, while eyes, lips red. 2 days before admission, the right side of the neck appears a size of the tumor-like size, refused to press. One day before admission, there was a patchy rash in the body. In the local application of “penicillin” and other treatment invalid transfer to our hospital. Personal history and past no special, sick before health. Admission examination: T38.4 ℃, P148 times / min, R40 beats / min, body weight: 6.5kg. Normal development of a moderate nutrition, irritability, systemic diffuse congestive miliary rash, the pressure of fading to double thighs, buttocks significantly. The right neck touched a 0.5 × 2cm irregular enlarged lymph nodes, mild activity, tenderness. Cardiopulmonary no abnormal hair