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甲型H1N1流感是一种新的甲型H1N1病毒引起的急性呼吸道传染病，具有较强的传染性，可通过近距离飞沫和接触传播．目前，甲型H1N1流感疫情已在全球较大范围内传播，世界卫生组织已将流感大流行预警级别提至5级． （1）甲型H1N1流感的病原体是______，它与禽流感和传染性非典型性肺炎的病原体的共同特点是______． （2）对于确诊病例，医务人员个人防护要求：每次接触病人后立即进行手清洗和消毒，这在预防该流感的措施上属于______． （3）目前科学家正在积极研制疫苗，一旦疫苗研发出来就会对预防该病起到积极作用，它将会使人体产生相应的______，这种免疫类型属于______．
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