Coordinates | 3°8′51″N101°41′36″N |
---|---|
Name | Allergy |
Caption | Hives are a common allergic symptom. |
Diseasesdb | 33481 |
Icd10 | |
Icd9 | |
Medlineplus | 000812 |
Emedicinesubj | med |
Emedicinetopic | 1101 |
Meshid | D006967 |
Icpc2 | A92 |
Other foods containing allergenic proteins include soy, wheat, fish, shellfish, fruits, vegetables, spices, synthetic and natural colors, chicken, and chemical additives.
Estimates vary on the percentage of the population that will have an immune system response. Approximately 25 percent of the population will have a strong allergic response to urushiol. Generally, approximately 80 percent to 90 percent of adults will develop a rash if they are exposed to of purified urushiol but some people are so sensitive that it only takes a molecular trace on the skin to initiate an allergic reaction.
The hygiene hypothesis was developed to explain the observation that hay fever and eczema, both allergic diseases, were less common in children from larger families, which were presumably exposed to more infectious agents through their siblings, than in children from families with only one child. The hygiene hypothesis has been extensively investigated by immunologists and epidemiologists and has become an important theoretical framework for the study of allergic disorders. It is used to explain the increase in allergic diseases that has been seen since industrialization, and the higher incidence of allergic diseases in more developed countries. The hygiene hypothesis has now expanded to include exposure to symbiotic bacteria and parasites as important modulators of immune system development, along with infectious agents.
Epidemiological data support the hygiene hypothesis. Studies have shown that various immunological and autoimmune diseases are much less common in the developing world than the industrialized world and that immigrants to the industrialized world from the developing world increasingly develop immunological disorders in relation to the length of time since arrival in the industrialized world.
Exposure to allergens, especially in early life, is an important risk factor for allergy. Alterations in exposure to microorganisms is another plausible explanation, at present, for the increase in atopic allergy. In particular, research suggests that allergies may coincide with the delayed establishment of gut flora in infants. It may be that the term 'parasite' could turn out to be inappropriate, and in fact a hitherto unsuspected symbiosis is at work. Vasomotor rhinitis, for example, is one of many maladies that shares symptoms with allergic rhinitis, underscoring the need for professional differential diagnosis.)||3.3 million (about 5.5% of the population) |- | Asthma ||10 million suffer from allergic asthma (about 3% of the population). The prevalence of asthma increased 75% from 1980-1994. Asthma prevalence is 39% higher in African Americans than in Europeans. Pirquet called this phenomenon "allergy" from the Ancient Greek words allos meaning "other" and ergon meaning "work". In 2006, the House of Lords convened a subcommittee that reported in 2007. It concluded likewise that allergy services were insufficient to deal with what the Lords referred to as an "allergy epidemic" and its social cost; it made several other recommendations.
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Category:Effects of external causes Category:Allergology Category:Immunology Category:Pulmonology Category:Immune system
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