Name the following: - $[1\times 6=6]$

1. Substances that cause allergy.
2. Harmful microorganisms that cause diseases.
3. The protection that someone's body gives them against a particular disease.
4. Red itchy patches on the skin.
5. A life-threatening condition in which the tissues swell up and make it difficult for the person to breathe.
6. Symptoms of allergy caused by the food allergens in the mouth and throat region.