Journal List > Allergy Asthma Respir Dis > v.3(1) > 1059087

Shin: Update on egg allergy in children

Abstract

Egg allergy is one of the most common food allergies in children and has a wide spectrum of clinical presentation including anaphylaxis. Many studies suggested egg-specific IgE cutoff values (diagnostic decision point) and skin prick test size that predict a clinical allergic reaction without oral food challenges. Some patients may react to all forms of egg including raw egg, but many egg-allergic patients tolerate baked egg products. A few studies reported that a high concentration of ovomucoid-specific IgE antibody indicates a high risk of reacting to heated egg white. Recently it has been suggested that regular ingestion of baked egg products may hasten tolerance development. Egg allergy may be more persistent than previously thought. The treatment of egg allergy still relies on dietary avoidance of egg-containing foods until tolerance has developed. In recent years there has been increasing success in clinical trials of egg oral immunotherapy, and oral immunotherapy can be a promising treatment modality for providing protection from reactions caused by accidental egg exposure. However, concerns regarding the safety and long-term efficacy still preclude the general use of oral immunotherapy in clinical practice. In this article, the recent literature regarding egg allergens, clinical presentation, diagnosis, management and natural history of egg allergy will be reviewed.

Figures and Tables

Table 1

Major egg white allergens

aard-3-15-i001
Allergen Name Constitute (%) Mw (kDa) IgE binding activity
Heat-treated Digestive enzyme-treated Allergenic activity
Gal d 1 Ovomucoid 11 28 Stable Stable +++
Gal d 2 Ovalbumin 54 45 Unstable Unstable ++
Gal d 3 Ovotransferrrin/conalbumin 12 76.6 Unstable Unstable +
Gal d 4 Lysozyme 3.4 14.3 Unstable Unstable ++
Table 2

Diagnostic decision points for serum egg-specific levels (Pharmacia ImmunoCAP)

aard-3-15-i002
Source Age group Challenges PPV (%) Sensitivity (%) NPV (%) Egg-specific IgE (kUA/L)
Sampson and Ho55) (1997) Children and adolescents 126 96 64 39 6.0
Boyano Martinez et al.33) (2001) < 2 yr 81 94 91 68 0.35
Celik-Bilgili et al.56) (2005) All children 227 95 - - 12.6
< 1 yr 41 10.9
≥ 1 yr 186 13.2
Peters et al.34) (2013) 1 yr 557 95 48 47 1.7

PPV, positive predictive value; NPV, negative predictive value.

Table 3

Diagnostic decision points for skin prick test wheal diameter to egg white

aard-3-15-i003
Source Age group No. PPV (%) Sensitivity (%) NPV (%) SPT wheal diameter (mm)
Sporik et al.36) (2000) <2 yr 39 100 - - 5
≥ 2 yr 98 - - 7
Boyano Martinez et al.33) (2001) < 2 yr 81 93 71 86 3
Verstege et al.57) (2005) All children 82 95 - - 13
<1 yr 11.2
≥ 1 yr 13.3
Peters et al.34) (2015) 1 yr 650 95 46 44 4

PPV, positive predictive value; NPV, negative predictive value; SPT, skin prick test.

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