某些因素导致机体抵抗力下降，寄生于动物体内的某些条件性病原体或隐性感染状态下的病原体大量生殖，一起感染。
内源性哮喘：哮喘发作与呼吸道感染有关，暴露于严寒，锻练，压力，吸入刺激物，药(如阿斯皮林)。
Intrinsic asthma: asthmatic attacks are precipitated by respiratory infections, exposure to cold, exercise, stress, inhaled irritants, and drugs such as aspirin.
目的研究早期干预对宫内感染致脑损伤新生大鼠内源性神经干细胞原位增殖能力的影响。
Objective To study the impact of early intervention on proliferation of neural stem cells in brain damage rats after intrauterine infection.
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