Infection of SARS might be concerned with the intensity and persistence of contact with the infectious sources.
感染SARS与接触传染源的程度以及持续接触时间有关。
So the main feature is that a patient with a chronic evolution of infection has adaptive responses which are functionally impaired and certainly this is very important to allow virus persistence.
所以，主要特征是感染慢性进展的患者其获得性免疫应答在功能上受到损害，这对允许病毒持续存在非常重要。
There is no increase in the rate of recurrence or persistence of infection related to the implantation of titanium mesh cages.
没有因为钛（网）笼的植入而增加再发或持续感染的比率。
So the main feature is that a patient with a chronic evolution of infection have adaptive responses which are functionally impaired and certainly this is very important to allow virus persistence.
所以，主要特征是感染慢性进展的患者其获得性免疫应答在功能上受到损害，这对允许病毒持续存在非常重要。
Occult HBV infection is characterized by the persistence of HBV DNA in the liver of individuals negative for HBV surface antigen (HBsAg).
隐性乙肝病毒（HBV）感染的特点是人体肝内乙肝病毒（HBV）DNA持续存在而HBV表面抗原（HBsAg）阴性。
Occult HBV infection is characterized by the persistence of HBV DNA in the liver of individuals negative for HBV surface antigen (HBsAg).
隐性乙肝病毒（HBV）感染的特点是人体肝内乙肝病毒（HBV）DNA持续存在而HBV表面抗原（HBsAg）阴性。
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