Species found in north america are nonpathogenic .

在北美的泰勒虫品种无致病性。

Streptococcus gordonii is a nonpathogenic gram-positive commensal bacterium and component of the normal microbial flora of the human oral cavity .

戈登氏链球菌是一种非致病性革兰氏阳性黏膜共生菌,参与组成人类口腔正常菌群。

One outcome is the modification of virions so that they remain structurally grossly intact yet sufficiently dysfunctional as to be nonpathogenic .

结果之一是病毒粒子改性，使它们保持完整结构严重失调，以尚未充分被致病性。