<unk> es are caused by an oversensitive immune system, leading to a misdirected immune response. The immune system normally protects the body against harmful substances such as bacteria and viruses.<unk>  occurs when the immune system reacts to substances <unk> ns) that are generally harmless and in most people do not cause an immune response.<unk>  hair and dander *cockroach calyx *dust mite excretion
Animal allergy
Laboratory animal allergy
Poultry allergy
Metal allergy
Fish allergy
Food allergy
Garlic allergy
Wheat allergy