患儿，男，24天。入院前2天发热、轻咳，后出疹，耳后，颈面部最先出现，发病前2周内，其父母先后患麻疹。父母儿童时期接种过麻疹疫苗，发病前父亲无明确麻疹接触史。体检：体温38．2℃，耳后，颈面部，躯干可见暗红色充血性斑丘疹，口腔颊粘膜处，可见麻疹粘膜斑。双肺呼吸音 Children, male, 24 days. 2 days before admission fever, light cough, after the rash, ears, neck first appeared, within 2 weeks before the onset, the parents had measles. Parents and children vaccinated during the measles vaccine, before the onset of my father had no clear history of exposure to measles. Physical examination: body temperature 38.2 ℃, behind the ear, neck, body visible dark red congestive rash, oral buccal mucosa, visible measles mucosa. Breathing sounds of the lungs