Share Tweet Share Email Follow. The Tony Awards are finally here and weâve got all the details on what time theyâre on, which channel you need to watch and where the show is taking place. This year, there are two hosts â Alan Cumming and Kristin Chenoweth, who are Broadway royalty.
An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. Such reactions are called allergies.
What are Allergies and Its Symptoms. An allergy is a heightened sensitivity to a foreign substance (called an allergen) that causes the body's defense system (the immune system) to overreact when defending itself. Normally, the immune system would only react if a harmful substance, such as bacteria, attacks the body.