致病的

Wild waterfowl are the natural reservoir of all influenza A viruses, and these viruses are usually nonpathogenic in these birds.

野生水鸟是所有甲型流感病毒的自然储存宿主，通常这些病毒对它们不具有致病性。

Wild waterfowl are the natural reseroir of all influenza A iruses, and these iruses are usually nonpathogenic in these birds.

野生水鸟是所有甲型流感病毒的自然储存宿主，通常这些病毒对它们不具有致病性。

Any of various flagellated,usually nonpathogenic protozoa of the genus Giardia that may be parasitic in the intestines of vertebrates including human beings and most domestic animals.

贾第鞭毛虫属一种鞭毛形通常是无致病原因的原生动物属贾第虫属，可能寄生在脊椎动物体内包括人和大部分家禽

The virus isolates' pathogenicities varied from completely nonpathogenic to highly lethal and were positively correlated with tracheal virus titers.

不仅如此，其中8个病毒株通过接触能够有效感染新的野鸭并能够在其体内大量复制而不表现致病性。

Any of various flagellated,usually nonpathogenic protozoa of the genus Giardia that may be parasitic in the intestines of vertebrate s including human beings and most domestic animals.

贾第鞭毛虫属一种鞭毛形通常是无致病原因的原生动物属贾第虫属，可能寄生在脊椎动物体内包括人和大部分家禽

PCV-1 is nonpathogenic for pigs,whereas Porcine circovirus type 2(PCV-2) is considered as the major causative agent of Postweaning multisystemic wasting syndrome in domestic pigs.

PCV-1对猪无致病性，而PCV-2被认为是引起断奶仔猪多系统衰竭综合征的主要病原。

To demonstrate experimentally the generation of velogenic NDV from a nonpathogenic waterfowl isolate, we passaged an avirulent goose isolate in chickens.

为了通过实验证明从水禽中分离的非致病型NDV可以转变为速发型病毒，我们通过在鸡体内传播鹅源性无毒力株，经气囊接种连续传代 9次，随后再在鸡脑内传代 5次。

Assessment of disease mechanisms and to profile the optimum therapeutic strategy.

支援病因探讨的致病机转及治疗。

Methods: This research based on the viewpoints of three theories, namely, the combination of exopathogens and inpathogens, coldness of body and drinking cold tends to impair lung, and overstrain leading to consumption of qi, combining with asthmatic nosogenesis of modern medicine.

依据"外内合邪"、"形寒饮冷则伤肺"、"劳则气耗"等观点，结合现代医学支气管哮喘致病原理，在冬季寒冷环境中，以冰水及寒性饮食饲养大鼠，配以冰水游泳，卵蛋白致敏的方法，建立支气管哮喘病寒饮蕴肺证大鼠模型。

AIM:To explore the pathogenic factors and clinical diagnosis of cerebral palsy.

目的：探讨脑性瘫痪的致病因素及临床诊断。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。