parainfluenza virus副流感病毒 number of pregnancies,abortions or miscarriages,and living children妊娠次数,流产或早产次数和活产儿数 paraplegina截瘫 paracetamol扑热息痛,醋氨酚 particle aiding replication of adenovirus腺病毒颗粒帮助复制