Saunders Company. You may have seen these effects illustrated by medicines that block histamine. Archived from the original on 30 November Make an appointment. Retrieved 28 February When friend becomes foe. In other projects Wikimedia Commons Wbat Wikivoyage.
Allergies are even behind some types of asthma, a breath-stealing condition. Allergens can be transferred from one food to another through genetic engineering ; however genetic modification can also remove allergens. Archived from the original on 14 April These T H 2 cells interact with other lymphocytes called B cells, whose role is production of antibodies. August Retrieved 24 April
Allergies are abnormal immune system reactions to things that are typically harmless to most people. When a person is allergic to something, the immune system mistakenly believes that this substance is harming the body. Substances that cause allergic reactions — such as some foods, dust, plant pollen, or medicines — are known as allergens. Allergies are a major cause of illness in the United States. Up to 50 million Americans, including millions of kids, have some type of allergy.