尽管似乎不是高致病性的，但仍发生了人与人之间的传染。

While it does not seem to be highly pathogenic, human to human transmission has been observed.

youdao

据知，它们携带H5和H7亚型病毒，但通常是低致病性的。

They are known to carry viruses of the H5 and H7 subtypes, but usually in the low pathogenic form.

youdao

由于病原菌致病性的高度分化，使得对稻瘟病很难控制和防治。

The high variability in pathogenicity of M. grisea isolates makes the control and management of rice blast difficult.

youdao

So maybe you could figure out how to use what we know about molecular biology, to engineer a new virus that's still immunogenic, but not pathogenic any longer.

也许你能指出如何使用,分子生物学的有关知识,来设计一个既能产生免疫性,但又不再有致病性的新病毒

耶鲁公开课 - 生物医学工程探索课程节选