What happens is your immune response goes haywire and then your body starts to attack itself, so theres a failure to shutdown.

VOA: special.2010.03.16

He moved most of his men into position to attack what he now knew was the weak, right side of the Union line.

VOA: special.2009.09.17

He stopped moving forward and prepared to defend against what seemed to be a strong Confederate attack.

VOA: special.2009.08.27

Voters know this, however, and are highly sceptical of what attack ads tell them.

ECONOMIST: The mid-term mud starts to fly

Antigen-presenting cells collect fragments of proteins from foreign bodies (normally pathogens, such as viruses and bacteria, but also transplanted organs) and show these to T cells, in order to tell them what to attack.

ECONOMIST: Breaching the body's defences

And what I worry about is that we're focusing way too much on what happened after the attack and not nearly enough on what happened in the weeks leading up to the attack.

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