inapparent infection meaning in English

不显性感染, 无症状性感染
非显性感染
隐性感染

Newcastle disease is a highly contagious and economically most important disease of poultry . the disease also inflicts many other avian species . the disease varies in degree of severity ranging from mild , inapparent infecion to severe disease . based on the severity of the disease in chickens , the causative agent of the disease , newcastle disease virus ( ndv ) , is divided into three pathotypes : ( 1 ) the lentogenic strains , which cause mild inapparent infection ; ( 2 ) the mesogenic strains , which cause mild respiratory symptoms with low mortality ; ( 3 ) the velogenic strain , which are highly virulent and cause high mortality
新城疫( newcastledisease ， nd )是由新城疫病毒( newcastlediseasevirus ， ndv )引起的侵害禽类的急性高度接触性传染病，是家禽传染性疾病中危害最严害的疫病之一，由于对世界养禽业危害极大，故被国际兽疫局确定为类传染病。在传染性疾病的预防中，疫苗是减少易感人群而被最广泛采用和最有效的途径。