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麻疹疑似病例出疹后3内采集的血标本检测阴性，可以订正为麻疹排除病例。()

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无免疫史者、免疫史不详或只有1剂次麻疹疫苗免疫史的接触者应在接触麻疹病人3天内及时接种麻疹疫苗。()

You should spend about 20 minutes on this task. The charts below show the percentage of time younger and older people spend on various Internet activities in their free time(excluding email). Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.

口腔粘膜斑是确诊麻疹病例的诊断依据。()

出现单一流行高峰之后，接着又出现一批病例，在流行曲线上形成拖尾现象，这种曲线符合同源共同传播后出现接触传播的特点。()