Wiktionary
n. The response of the immune system to an allergen
Wikipedia
An allergic response is a hypersensitive immune reaction to a substance that normally is harmless or would not cause an immune response in everyone. An allergic response may cause harmful symptoms such as itching or inflammation or tissue injury.
Usage examples of "allergic response".
Even while they paused, and while I prayed that my unfelicitous scent might not betray us, and while I squeezed the darkened walnut grip, I had my left hand to my mouth that I might smother my helpless giggling.
ImpSec's defense against the truth drug was to induce a fatal allergic response in its key operatives.
Unfortunately, the young man reacted poorly to the third Rossak drug, an allergic response that caused his throat to swell.
Rossak drug, an allergic response that caused his throat to swell.
It seemed to John that Ann ought to be enjoying the storm and the horrendous knock it had put on the terraforming process, like some kind of planetary allergic response, the temperatures plummeting below the baseline, the reckless experimenters struggling with their puny clogged machines.