我敲了前门，没有应答。

I knocked at the front door and there was no answer.

《柯林斯英汉双解大词典》

当迈可试图联络赛尔夫，他没有应答。

Yet when Michael tries to call Self, he does not answer.

youdao

如果在我敲门的时候你没有应答，我就试着撬开它。

If you don't answer when I knock, I try the door.

youdao

So, there's no absolutes about this, this is a general response where all the features can be different with different pathogens.

这其中并没有明确的规律,免疫应答是普遍存在的,但针对不同的病原体的应答规律各不相同

耶鲁公开课 - 生物医学工程探索课程节选