Itching is often the first sign of a severe allergic reaction.

There was no sign of an allergic reaction on any day.

These are signs of an allergic reaction to the medicine.

Even a minor skin rash could be an early sign of a serious reaction.

You may have other serious side effects that may not be signs of an allergic reaction.

Abacavir can cause other serious side effects that may not be signs of an allergic reaction.

It could be a sign of an allergic reaction, or a harmless side effect.

It could be a sign of an allergic reaction to the medication or a serious side effect.

She watched her father's face for signs of a reaction, but saw only bafflement.

"Are there any signs of a reaction among our targets?"