WordNet
- throw eggs at
- animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds
- oval reproductive body of a fowl (especially a hen) used as food (同)eggs
- coat with beaten egg; "egg a schnitzel"
- pathological sensitivity
- extreme sensitivity
- the base of the natural system of logarithms; approximately equal to 2.718282...
PrepTutorEJDIC
- 『卵』,卵細胞 / 鳥の卵;(特に)鶏卵 / 《英話》《形容詞を伴って》(…な)やつ / 《俗》爆弾,手投げ弾
- 〈人〉‘を'扇動(激励)する;〈人〉‘を'そそのかして…させる《+『名』+『on to』 do》
- 過敏,過敏症
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2018/02/17 12:28:29」(JST)
wiki en
| Egg allergy | |
|---|---|
| Fried chicken egg | |
| Classification and external resources | |
| ICD-10 | T78.0, T78.1, L23.6, L27.2, Z91.0 |
| ICD-9-CM | V15.03 |
| MeSH | D021181 |
|
[edit on Wikidata]
|
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Egg allergy is an immune hypersensitivity to proteins found in chicken eggs, and possibly goose, duck, or turkey eggs.[1] Symptoms can be either rapid or gradual in onset. The latter can take hours to days to appear. The former may include anaphylaxis, a potentially life-threatening condition which requires treatment with epinephrine. Other presentations may include atopic dermatitis or inflammation of the esophagus.[1][2]
In the United States, 90% of allergic responses to foods are caused by cow's milk, eggs, wheat, shellfish, peanuts, tree nuts, fish, and soy beans.[3] The Food Allergen Labeling and Consumer Protection Act (FALCPA) of 2004 requires that the label of a food that contains an ingredient that is or contains protein from these eight major food allergens declare the presence of the allergen in the manner described by the law.[4] Eggs are also on the mandatory labeling list in Japan[5] and the European Union.[6]
Prevention is by avoiding eating eggs and foods that may contain eggs, such as cake or cookies.[1] It is unclear if the early introduction of the eggs to the diet of babies aged 4–6 months decreases the risk of egg allergies.[7][8][9][10]
Egg allergy appears mainly in children but can persist into adulthood. In the United States, it is the second most common food allergy in children after cow's milk. Most children outgrow egg allergy by the age of five, but some people remain allergic for a lifetime.[5][11] In North America and Western Europe egg allergy occurs in 0.5% to 2.5% of children under the age of five years.[1][12] The majority grow out of it by school age, but for roughly one-third, the allergy persists into adulthood. Strong predictors for adult-persistence are anaphylaxis, high egg-specific serum immunoglobulin E (IgE), robust response to the skin prick test and absence of tolerance to egg-containing baked foods.[1][13]
Contents
- 1 Signs and symptoms
- 2 Causes
- 2.1 Eating egg
- 2.2 Vaccines
- 2.3 Exercise
- 3 Mechanisms
- 3.1 Non-allergic intolerance
- 4 Diagnosis
- 5 Prevention
- 6 Treatment
- 6.1 Immunotherapy
- 6.2 Avoiding eggs
- 7 Prognosis
- 8 Epidemiology
- 9 Society and culture
- 10 See also
- 11 References
Signs and symptoms
Food allergies usually have a fast onset (from seconds to one hour). Symptoms may include: rash, hives, itching of mouth, lips, tongue, throat, eyes, skin, or other areas, swelling of lips, tongue, eyelids, or the whole face, difficulty swallowing, runny or congested nose, hoarse voice, wheezing, shortness of breath, diarrhea, abdominal pain, lightheadedness, fainting, nausea, or vomiting.[14] Symptoms of allergies vary from person to person and may vary from incident to incident.[14] Serious danger regarding allergies can begin when the respiratory tract or blood circulation is affected. The former can be indicated by wheezing, a blocked airway and cyanosis, the latter by weak pulse, pale skin, and fainting. When these symptoms occur the allergic reaction is called anaphylaxis.[14] Anaphylaxis occurs when IgE antibodies are involved, and areas of the body that are not in direct contact with the food become affected and show severe symptoms.[14][15] Untreated, this can proceed to vasodilation, a low blood pressure situation called anaphylactic shock, and death (very rare).[5][15]
Young children may exhibit dermatitis/eczema on face, scalp and other parts of the body, in older children knees and elbows are more commonly afflicted. Children with dermatitis are at greater than expected risk of also exhibiting asthma and allergic rhinitis.[16]
Causes
Eating egg
The cause is typically the eating of eggs or foods that contain eggs. Briefly, the immune system over-reacts to proteins found in eggs. This allergic reaction may be triggered by small amounts of egg, even egg incorporated into cooked foods, such as cake. People with an allergy to chicken eggs may also be reactive to goose, duck, or turkey eggs.[1]
Vaccines
Influenza vaccines are created by injecting a live virus into fertilized chicken eggs.[17] The viruses are harvested, killed and purified, but a residual amount of egg white protein remains. Each year, vaccines are created to provide protection against the flu viruses expected to be prevalent in the upcoming cold weather months.[17] For the 2017-2018 flu season, the vaccines are described as IIV3 and IIV4 for resistance to the expected three or four viruses. For adults ages 18 and older there is also an option to receive recombinant flu vaccines (RIV3 or RIV4) which are grown on mammalian cell cultures instead of in eggs, and so are no risk for people with severe egg allergy.[18] Recommendations are that for people with a history of mild egg allergy should receive any IIV or RIV vaccine. People with a more severe allergic reaction may also receive any IIV or RIV, but in an inpatient or outpatient medical setting, administered by a healthcare provider. People with a known severe allergic reaction to influenza vaccine (which could be egg protein or the gelatin or the neomycin components of the vaccine) should not receive a flu vaccine.[18]
Each year the American Academy of Pediatrics (AAP) publishes recommendations for prevention and control of influenza in children.[19][20][21] In the most recent guidelines, for 2016-2017, a change was made, that children with a history of egg allergy may receive the IIV3 or IIV4 vaccine without special precautions. It does, however, state that "Standard vaccination practice should include the ability to respond to acute hypersensitivity reactions."[19] Prior to this, AAP recommended precautions based on egg allergy history: if no history, immunize; if a history of mild reaction, i.e., hives, immunize in a medical setting with healthcare professionals and resuscitative equipment available; if a history of severe reactions, refer to an allergist.[20][21]
The measles and mumps parts of the "MMR vaccine" (for measles, mumps, and rubella) are cultured on chick embryo cell culture and contain trace amounts of egg protein. The amount of egg protein is lower than in influenza vaccines and the risk of an allergic reaction is much lower.[22] One guideline stated that all infants and children should get the two MMR vaccinations, mentioning that "Studies on large numbers of egg-allergic children show there is no increased risk of severe allergic reactions to the vaccines."[23] Another guideline recommended that if a child has a known medical history of severe anaphylaxis reaction to eggs, then the vaccination should be done in a hospital center, and the child be kept for observation for 60 minutes before being allowed to leave.[22] The second guideline also stated that if there was a severe reaction to the first vaccination - which could have been to egg protein or the gelatin and neomycin components of the vaccine - the second is contraindicated.[22]
Exercise
There is a condition called food-dependent, exercise-induced anaphylaxis (FDEIAn). Exercise can trigger hives and more severe symptoms of an allergic reaction. For some people with this condition, exercise alone is not sufficient, nor consumption of a food to which they are mildly allergic sufficient, but when the food in question is consumed within a few hours before high intensity exercise, the result can be anaphylaxis. Egg are specifically mentioned as a causative food.[24][25][26] One theory is that exercise is stimulating the release of mediators such as histamine from IgE-activated mast cells.[26] Two of the reviews postulate that exercise is not essential for the development of symptoms, but rather that it is one of several augmentation factors, citing evidence that the culprit food in combination with alcohol or aspirin will result in a respiratory anaphylactic reaction.[24][26]
Mechanisms
Conditions caused by food allergies are classified into three groups according to the mechanism of the allergic response:[27]
- IgE-mediated (classic) – the most common type, manifesting acute changes that occur shortly after eating, and may progress to anaphylaxis
- Non-IgE mediated – characterized by an immune response not involving immunoglobulin E; may occur hours to days after eating, complicating diagnosis
- IgE and non-IgE-mediated – a hybrid of the above two types
Allergic reactions are hyperactive responses of the immune system to generally innocuous substances, such as proteins in the foods we eat. Why some proteins trigger allergic reactions while others do not is not entirely clear, although in part thought to be due to resistance to digestion. Because of this, intact or largely intact proteins reach the small intestine, which has a large presence of white blood cells involved in immune reactions.[28] The heat of cooking structurally degrades protein molecules, potentially making them less allergenic.[29] The pathophysiology of allergic responses can be divided into two phases. The first is an acute response that occurs immediately after exposure to an allergen. This phase can either subside or progress into a "late-phase reaction" which can substantially prolong the symptoms of a response, and result in more tissue damage.
In the early stages of acute allergic reaction, lymphocytes previously sensitized to a specific protein or protein fraction react by quickly producing a particular type of antibody known as secreted IgE (sIgE), which circulates in the blood and binds to IgE-specific receptors on the surface of other kinds of immune cells called mast cells and basophils. Both of these are involved in the acute inflammatory response.[30] Activated mast cells and basophils undergo a process called degranulation, during which they release histamine and other inflammatory chemical mediators called (cytokines, interleukins, leukotrienes, and prostaglandins) into the surrounding tissue causing several systemic effects, such as vasodilation, mucous secretion, nerve stimulation, and smooth-muscle contraction. This results in runny nose, itchiness, shortness of breath, and potentially anaphylaxis. Depending on the individual, the allergen, and the mode of introduction, the symptoms can be system-wide (classical anaphylaxis), or localized to particular body systems; asthma is localized to the respiratory system while eczema is localized to the skin.[30]
After the chemical mediators of the acute response subside, late-phase responses can often occur due to the migration of other white blood cells such as neutrophils, lymphocytes, eosinophils, and macrophages to the initial reaction sites. The is usually seen 2–24 hours after the original reaction.[31] Cytokines from mast cells may also play a role in the persistence of long-term effects. Late-phase responses seen in asthma are slightly different from those seen in other allergic responses, although they are still caused by release of mediators from eosinophils.[32]
Five major allergenic proteins from the egg of the domestic chicken (Gallus domesticus) have been identified; these are designated Gal d 1-5. Four of these are in egg white: ovomucoid (Gal d 1), ovalbumin (Gal d 2), ovotransferrin (Gal d 3) and lysozyme (Gal d 4). Of these, ovomucoid is the dominant allergen, and one that is less likely to be outgrown as children get older.[1] Ingestion of under-cooked egg may trigger more severe clinical reactions than well-cooked egg. In egg yolk, alpha-livetin (Gal d 5) is the major allergen, but various vitellins may also trigger a reaction. People allergic to alpha-livetin may experience respiratory symptoms such as rhinitis and/or asthma when exposed to chickens, because the yolk protein is also found in live birds.[1] In addition to IgE-mediated responses, egg allergy can manifest as atopic dermatitis, especially in infants and young children. Some will display both, so that a child could react to an oral food challenge with allergic symptoms, followed a day or two later with a flare up of atopic dermatitis and/or gastroinstestinal symptoms, including allergic eosinophilic esophagitis.[1][12]
Non-allergic intolerance
Egg whites, which are potentially histamine liberators, also provoke a nonallergic response in some people. In this situation, proteins in egg white directly trigger the release of histamine from mast cells.[33][34] Because this mechanism is classified as a pharmacological reaction, or "pseudoallergy",[33] the condition is considered a food intolerance instead of a true immunoglobulin E (IgE) based allergic reaction.
The response is usually localized, typically in the gastrointestinal tract.[33] Symptoms may include abdominal pain, diarrhea, or any other symptoms typical to histamine release. If sufficiently strong, it can result in an anaphylactoid reaction, which is clinically indistinguishable from true anaphylaxis.[34] Some people with this condition tolerate small quantities of egg whites.[35] They are more often able to tolerate well-cooked eggs, such as found in cake or dried egg-based pasta, than incompletely cooked eggs, such as fried eggs or meringues, or uncooked eggs.[35]
Diagnosis
Diagnosis of egg allergy is based on the person's history of allergic reactions, skin prick test (SPT), patch test and measurement of egg-specific serum immunoglobulin E (IgE or sIgE). Confirmation is by double-blind, placebo-controlled food challenges.[12][13] SPT and sIgE have sensitivity greater than 90% but specificity in the 50-60% range, meaning these tests will detect an egg sensitivity, but will also be positive for other allergens.[36] For young children, attempts have been made to identify SPT and sIgE responses strong enough to avoid the need for a confirming oral food challenge.[37]
Prevention
When eggs are introduced to a baby's diet is thought to affect risk of developing allergy, but there are contradictory recommendations. A 2016 review acknowledged that introducing peanuts early appears to have a benefit, but stated "The effect of early introduction of egg on egg allergy are controversial."[8] A meta-analysis published the same year supported the theory that early introduction of eggs into an infant's diet lowers risk,[7] and a review of allergens in general stated that introducing solid foods at 4–6 months may result in the lowest subsequent allergy risk.[9] However, an older consensus document from the American College of Allergy, Asthma and Immunology recommended that introduction of chicken eggs be delayed to 24 months of age.[10]
Treatment
Treatment for accidental ingestion of milk products by allergic individuals varies depending on the sensitivity of the person. An antihistamine such as diphenhydramine (Benadryl) may be prescribed. Sometimes prednisone will be prescribed to prevent a possible late phase Type I hypersensitivity reaction.[38] Severe allergic reactions (anaphalaxis) may require treatment with an epinephrine pen, i.e., an injection device designed to be used by a non-healthcare professional when emergency treatment is warranted. A second dose is needed in 16-35% of episodes.[39]
Immunotherapy
There is active research on trying oral immunotherapy (OIT) to desensitize people to egg allergens. A Cochrane Review concluded that OIT can desensitize people, but it remains unclear whether long-term tolerance develops after treatment ceases, and 69% of the people enrolled in the trials had adverse effects. They concluded there was a need for standardized protocols and guidelines prior to incorporating OIT into clinical practice.[40] A second review noted that allergic reactions, up to anaphylaxis, can occur during OIT, and recommends this treatment not be routine medical practice.[41] A third review limited its scope to trials of baked egg-containing goods such as bread or cake as a means of resolving egg allergy. Again, there were some successes, but also some severe allergic reactions, and the authors came down on the side of not recommending this as treatment.[42]
Avoiding eggs
Prevention of egg-allergic reactions means avoiding eggs and egg-containing foods. People with an allergy to chicken eggs may also be allergic to other types of eggs, such as goose, duck, or turkey eggs.[1] In cooking, eggs are multifunctional: they may act as an emulsifier to reduce oil/water separation (mayonnaise), a binder (water binding and particle adhesion, as in meatloaf), or an aerator (cakes, especially angel food). Some commercial egg substitutes can substitute for particular functions (potato starch and tapioca for water binding, whey protein for aeration or particle binding, or soy lecithin or avocado for emulsification). Food companies produce egg-free mayonnaise and other replacement foods. Alfred Bird invented egg-free Bird's Custard, the original version of what is known generically as custard powder today.[43]
Most people find it necessary to strictly avoid any item containing eggs, including:[11]
- Albumin (egg white protein)
- Apovitellin (egg yolk protein)
- Egg Beaters (cholesterol-free, uses egg whites)
- Dried egg solids, powdered egg
- Egg, egg white, egg yolk
- Egg wash
- Eggnog
- Fat substitutes (some)
- Livetin (egg yolk protein)
- Lysozyme (egg white protein)
- Mayonnaise
- Meringue or meringue powder
- Ovalbumin (egg white protein)
- Ovoglobulin (egg white protein)
- Ovomucin (egg white protein)
- Ovomucoid (egg white protein)
- Ovotransferrin (egg white protein)
- Ovovitelia (egg yolk protein)
- Ovovitellin (egg yolk protein)
- Silici albuminate
- Simplesse
- Vitellin (egg yolk protein)
Ingredients that sometimes include egg protein include: artificial flavoring, natural flavoring, lecithin and nougat candy.
Probiotic products have been tested, and some found to contain milk and egg proteins which were not always indicated on the labels.[44]
Prognosis
The majority of children outgrow egg allergy. One review reported that 70% of children will outgrow this allergy by 16 years.[13] In subsequently published longitudinal studies, one reported that for 140 infants who had challenge-confirmed egg allergy, 44% had resolved by two years.[45] A second reported that for 203 infants with confirmed IgE-mediated egg allergy, 45% resolved by two years of age, 66% by four years, and 71% by six years.[46] Children will be able to tolerate eggs as an ingredient in baked goods and well-cooked eggs sooner than under-cooked eggs.[13] Resolution was more likely if baseline serum IgE was lower, and if the baseline symptoms did not include anaphylaxis.[13][46]
Epidemiology
In countries in North America and western Europe, where use of cow's milk based infant formula is common, chicken egg allergy is the second most common food allergy in infants and young children after cow's milk.[12][13][47] However, in Japan, egg allergy is first and cow's milk second, followed by wheat and then the other common allergenic foods.[5] A review from South Africa reported egg and peanut as the two most common allergenic foods.[48]
Incidence and prevalence are terms commonly used in describing disease epidemiology. Incidence is newly diagnosed cases, which can be expressed as new cases per year per million people. Prevalence is the number of cases alive, expressible as existing cases per million people during a period of time.[49] Egg allergies are usually observed in infants and young children, and often disappear with age (see Prognosis), so prevalence of egg allergy may be expressed as a percentage of children under a set age. One review estimates that in North American and western European populations the prevalence of egg allergy in children under the age of five years is 1.8-2.0%.[12] A second described the range in young children as 0.5-2.5%.[1] Although the majority of children develop tolerance as they age into school age years, for roughly one-third the allergy persists into adulthood. Strong predictors for adult-persistent allergy are anaphylactic symptoms as a child, high egg-specific serum IgE, robust response to the skin prick test and absence of tolerance to egg-containing baked foods.[13][1] Self-reported allergy prevalence is always higher than food-challenge confirmed allergy.
For all age groups, a review of fifty studies conducted in Europe estimated 2.5% for self-reported egg allergy and 0.2% for confirmed.[47] National survey data in the United States collected in 2005 and 2006 showed that from age six and older, the prevalence of serum IgE confirmed egg allergy was under 0.2%.[50]
Adult-onset of egg allergy is rare, but there is confirmation of cases. Some were described as having started in late teenage years; another group were workers in the baking industry who were exposed to powdered egg dust.[51]
Society and culture
Whether food allergy prevalence is increasing or not, food allergy awareness has definitely increased, with impacts on the quality of life for children, their parents and their immediate caregivers.[52][53][54][55] In the United States, the Food Allergen Labeling and Consumer Protection Act of 2004 causes people to be reminded of allergy problems every time they handle a food package, and restaurants have added allergen warnings to menus. The Culinary Institute of America, a premier school for chef training, has courses in allergen-free cooking and a separate teaching kitchen.[56] School systems have protocols about what foods can be brought into the school. Despite all these precautions, people with serious allergies are aware that accidental exposure can easily occur at other peoples' houses, at school or in restaurants.[57] Food fear has a significant impact on quality of life.[54][55] Finally, for children with allergies, their quality of life is also affected by actions of their peers. There is an increased occurrence of bullying, which can include threats or acts of deliberately being touched with foods they need to avoid, also having their allergen-free food deliberately contaminated.[58]
See also
- List of allergens (food and non-food)
References
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Allergic conditions
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| Blood and immune system |
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Hypersensitivity and autoimmune diseases (279.5–6)
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Type II/ADCC
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| Type III (Immune complex) |
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UpToDate Contents
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- 1. 卵アレルギー：管理 egg allergy management
- 2. 食物アレルゲン：臨床的特徴および交叉反応の概要 food allergens overview of clinical features and cross reactivity
- 3. 卵アレルギー：臨床的特徴および診断 egg allergy clinical features and diagnosis
- 4. 卵アレルギーのある人におけるインフルエンザワクチン influenza vaccination in individuals with egg allergy
- 5. 小児における季節性インフルエンザワクチン seasonal influenza vaccination in children
English Journal
- No evidence for contraindications to the use of propofol in adults allergic to egg, soy or peanut†.
- Asserhøj LL1, Mosbech H2, Krøigaard M2, Garvey LH2.
- British journal of anaesthesia.Br J Anaesth.2016 Jan;116(1):77-82. doi: 10.1093/bja/aev360.
- BACKGROUND: Propofol is thought to be a potential cause of allergic reactions in patients allergic to egg, soy or peanut, since current formulations contain an emulsion that includes egg lecithin and soybean oil. However, other than six case reports lacking in confirmatory evidence of an allergic re
- PMID 26675952
- Frequency of food group consumption and risk of allergic disease and sensitization in schoolchildren in urban and rural China.
- Yang Z1, Zheng W1, Yung E2, Zhong N1, Wong GW2, Li J1.
- Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology.Clin Exp Allergy.2015 Dec;45(12):1823-32. doi: 10.1111/cea.12532.
- BACKGROUND: Diet is a potential determinant of allergic diseases.OBJECTIVE: To examine in schoolchildren the association between food intake and allergic diseases and determine whether there is effect of environment - rural vs. urban.METHODS: A questionnaire survey was performed in 11 473 children
- PMID 25787117
- Health-related quality of life in children with objectively diagnosed staple food allergy assessed with a disease-specific questionnaire.
- Protudjer JL1,2, Jansson SA1,3, Östblom E1,4,5, Arnlind MH6,7, Bengtsson U8, Dahlén SE1,2, Kallström-Bengtsson I9, Marklund B10, Middelveld RJ1,2, Rentzos G8, Sundqvist AC4, Åkerström J8, Ahlstedt S1.
- Acta paediatrica (Oslo, Norway : 1992).Acta Paediatr.2015 Oct;104(10):1047-54. doi: 10.1111/apa.13044. Epub 2015 Jul 6.
- AIM: Among Swedish children of 0-12 years old, we investigated various food allergy-related exposures associated with health-related quality of life using a food allergy-specific questionnaire among children allergic to the staple foods cow's milk, hen's egg and/or wheat, and contextualised worse f
- PMID 25983039
Japanese Journal
- 卵殻未焼成カルシウムのアレルゲン性について
- 海老澤 元宏,田知本 寛,池松 かおり [他],杉崎 千鶴子,増田 泰伸,木村 守
- アレルギー 54(5), 471-477, 2005-05-30
- 【背景, 目的】卵殻カルシウムの卵としてのアレルゲン性についての検討はほとんどされていない. 卵殻カルシウムの中でも未焼成カルシウムのアレルゲン性については明確になっておらず, エビデンスがないということによりアレルギー表示の対象となっている. 【方法】市販の卵殻未焼成カルシウムのアレルゲン性について, 電気泳動法(SDS-PAGE), ウエスタンブロット法, inhibition ELISA法お …
- NAID 110002435812
- 小児アトピー性皮膚炎に合併する即時型食物アレルギーに関する検討
- 伊藤 浩明,森下 雅史,伊藤 朱美,坂本 龍雄,鳥居 新平
- アレルギー 53(1), 24-33, 2004-01-30
- アトピー性皮膚炎(AD)の小児の多<は,即時型食物アレルギーを合併し,それが皮膚炎の悪化因子となるか否かに拘わらず適切な対応が必要とされる.今回,ADにおける食物アレルギーの合併状況を明らかにする目的で,当科外来を1年間に受診し,6ヵ月以上の経過観察を経て診断を確定したAD全症例(182名,平均年齢4.9±5.1歳)を対象として,経口負荷試験や摂取時の即時型誘発症状によって診断された食物アレ …
- NAID 110002404778
- Effects of Conjugated Linoleic Acid on Anaphylaxis and Allergic Pruritus
- Ishiguro Kyoko,Oku Hisae,Suitani Akiko [他],YAMAMOTO Yoshikuni
- Biological & pharmaceutical bulletin 25(12), 1655-1657, 2002-12-01
- … Inhibitory effects of CLA were observed on the immediate (type 1) hypersensitivity reaction, with CLA significantly suppressing the decrease in blood pressure (BP) and blood flow (BF) induced by the hen egg-white lysozyme (HEL)-anaphylactic reaction in ddY mice. …
- NAID 130000111746
Related Links
- Egg Hypersensitivity; Allergy, Egg; Hypersensitivity, Egg. On-line free medical diagnosis assistant. Ranked list of possible diseases from either several symptoms or a full patient history. A similarity measure between symptoms and ...
- El término Egg hypersensitivity figura en la edición en idioma inglés de Wikipedia. Allí se dice al respecto lo siguiente: Egg allergy is a type of food allergy. It is a hypersensitivity to dietary substances from the yolk or whites of eggs ...
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