Consensus Communication on Early Peanut Introduction and the Prevention of Peanut Allergy in High-Risk Infants
On behalf of:
- American Academy of Asthma, Allergy, and Immunology
- American Academy of Pediatrics
- American College of Allergy, Asthma, and Immunology
- Australasian Society of Clinical Immunology and Allergy
- Canadian Society of Allergy and Clinical Immunology
- European Academy of Allergy and Clinical Immunology
- Israel Association of Allergy and Clinical Immunology
- Japanese Society for Allergology
- Society for Pediatric Dermatology
- World Allergy Organization
(AAAAI) David M. Fleischer, MD; (AAP) Scott Sicherer, MD; (ACAAI) Matthew Greenhawt, MD; (ASCIA) Dianne Campbell, MB BS FRACP PhD; (CSACI) Edmond Chan, MD; (EAACI) Antonella Muraro, MD, PhD, Susanne Halken, MD; (ISACI) Yitzhak Katz, MD; (JSA) Motohiro Ebisawa, MD, PhD; (SPD) Lawrence Eichenfield, MD; (WAO) Hugh Sampson, MD.
LEAP Study Team:
Gideon Lack, MB, BCh (WAO); George duToit, MB, BCh and Graham Roberts, DM (EAACI); and Henry Bahnson, MPH (Rho, Inc).
(AAAAI) Jonathan Hourihane, MD, Jonathan Spergel, MD, PhD, Michael Young, MD; (ACAAI) Amal As'aad, MD; (ASCIA) Katrina Allen, BMedSc MB BS FRACP PhD, Susan Prescott, BMedSc MB BS FRACP PhD; (CSACI) Sandeep Kapur, MD; (JSA) Hirohisa Saito, MD, PhD; (EAACI) Ioana Agache, MD, Cezmi A. Akdis, MD, PhD, Hasan Arshad, MD, Kirsten Beyer, MD, Anthony Dubois, MD, Philippe Eigenmann, MD, Monserrat FernandezRivas, MD, Kate Grimshaw, Karin Hoffman –Sommergruber, PhD, Arne Host, MD, Susanne Lau MD, Liam O’Mahony, MD, Clare Mills, PhD, Nikolaus Papadopoulos, MD, Carina Venter, BSc, PhD; (ISACI) Nancy Agmon-Levin, MD, Aharon Kessel , MD; (SPD) Richard Antaya, MD, Beth Drolet, MD; (WAO) Lanny Rosenwasser, MD.
Sources of support:
- LEAP: Learning Early About Peanut
- NIAID: National Institute of Allergy and Infectious Diseases
- EAACI: European Academy of Allergy and Clinical Immunology
- SPT: skin prick test
- ITT: intention-to-treat
- NNT: number needed to treat
Introduction and Rationale
Peanut allergy is an increasingly troubling global health problem, which affects between 1-3% of children in many westernized countries. Although multiple methods of measurement have been used and specific estimates differ, there appears to be a sudden increase in the number of cases in the past 10 – 15 year period, suggesting that the prevalence may have tripled in some countries, such as the USA. Extrapolating the currently estimated prevalence, this translates to nearly 100,000 new cases annually (in the USA and UK), affecting some 1 in 50 primary school-aged children in the USA, Canada, UK, and Australia. A similar rise in incidence is now being noted in developing countries such as Ghana.1-6
The purpose of this brief communication is to highlight emerging evidence to existing allergy prevention guidelines regarding potential benefits of supporting early, rather than delayed, peanut introduction during the period of complementary food introduction in infants. The recent study, entitled “Randomized Trial of Peanut Consumption in Infants at Risk for Peanut Allergy (Learning Early About Peanut - LEAP Trial),” demonstrated a successful 11% - 25% absolute reduction in the risk of developing peanut allergy in high-risk infants (and a relative risk reduction of up to 80%) if peanut was introduced between 4 and 11 months of age.7 In light of the significance of these findings, this document serves to better inform the decision-making process for healthcare providers regarding such potential benefits of early peanut introduction. More formal guidelines regarding early-life, complementary feeding practices and the risk of allergy development will follow in the next year from the National Institute of Allergy and Infectious Diseases (NIAID)-sponsored Working Group and the European Academy of Allergy and Clinical Immunology (EAACI), and thus this document should be considered as interim guidance.
Summary of New Evidence
In the LEAP trial, 640 high-risk UK infants (See Textbox 1) between the ages of 4 to 11 months were randomized to consume peanut products at least three times a week (6 g of peanut protein; equivalent to 24 peanuts or 6 teaspoons of peanut butter per week) or to completely avoid peanut products for the first five years of life. This included 542 infants found to have negative skin prick tests (SPT) to peanut at study entry, and 98 infants with SPT wheal diameters to peanut between 1 to 4 mm (minimally SPT positive) at study entry. An additional 76 children were excluded from study entry prior to randomization based on SPT > 5mm, which was assumed to have a very high likelihood of reacting to a peanut challenge. In an Intention-To-Treat (ITT) analysis, 17.2% in the peanut avoidance group compared to 3.2% in the peanut consumption group developed food challenge-proven peanut allergy by age 5 years, corresponding to a 14% absolute risk reduction, a number needed to treat (NNT, e.g. number of persons needed to be treated for one to receive benefit) of 7.1, and a relative risk reduction of 80%.7
When examined in further detail, the isolated beneficial effects for both the primary and secondary prevention of peanut allergy translated to a NNT = 8.5 within the SPT negative and NNT = 4 within the minimally SPT positive infants. Secondary analyses also showed similar levels of prevention in White, Black and Asian (Indian and Pakistani) children. Overall, the risk of early introduction in this group was low – 7 of the 319 children randomized to the consumption group reacted to peanut at the baseline food challenge suggesting that peanut food challenges and introduction, even in minimally SPT positive infants, is safe and feasible. Six children in the consumption group developed peanut allergy during the study indicating that peanut allergy can still develop despite attempts at primary and secondary prevention. Finally, the LEAP trial only included high-risk infants with a minimal or negative SPT to peanut, and therefore does not address a strategy for those without these risk factors for developing peanut allergy.7
How Does The LEAP Trial Affect Present Guidance for Early Complementary Feeding Practices?
Existing guidelines pertaining to the early introduction of complementary foods have indicated that the introduction of highly allergenic foods, such as peanut, need not be delayed past 4 or 6 months of life. However, they do not actively recommend introduction of peanut between 4 – 6 months of age in high-risk infants, and some of these guidelines specify that certain infants considered at high risk for the development of allergic disease are recommended to first consult an expert.8-14
The LEAP data provide Level 1 evidence that the practice of early peanut introduction is safe and effective in selected high-risk infants. This study is the first prospective, randomized trial of early peanut intervention, and informs provider decision-making regarding high-risk infants, including those already with a positive peanut SPT but not yet clinically reactive, to receive the benefits noted in the LEAP study, which may reduce the risk of developing peanut allergy up to 80%.
Of note, since children with lesser risk factors for peanut allergy were excluded from enrollment in LEAP, there are no prospective, randomized data investigating the benefit or risk of early peanut introduction in the general to low-risk populations. Consequently, this communication’s guidance is limited to integrating the findings learned in the LEAP trial to other similar high-risk children in more diverse settings around the world. However, multiple guidelines have not recommended delaying allergen introduction in the general to low-risk populations.
Interim Guidance Regarding Early Peanut Introduction
Based on data generated in the LEAP trial and existing guidelines, the following interim guidance is suggested to assist the clinical decision-making of healthcare providers:
- There is now scientific evidence (Level 1 evidence from a randomized controlled trial) that healthcare providers should recommend introducing peanut-containing products into the diet of “high-risk” infants early on in life (between 4 – 11 months of age) in countries where peanut allergy is prevalent, since delaying the introduction of peanut may be associated with an increased risk of developing peanut allergy.
- Infants with early-onset atopic disease, such as severe eczema, or egg allergy in the first 4-6 months of life (see Text Box 1 for example LEAP criteria), may benefit from evaluation by an allergist or physician trained in management of allergic diseases in this age group to diagnose any food allergy and assist in implementing these suggestions regarding the appropriateness of early peanut introduction. Evaluation of such patients may consist of performing peanut skin testing and/or in-office observed peanut ingestion, as deemed appropriate following discussion with the family. The clinician may perform an observed peanut challenge for those with evidence of a positive peanut skin test to determine if they are clinically reactive, before initiating at-home peanut introduction. Both such strategies were used in the LEAP study protocol.
- Adherence in the LEAP trial was excellent (92%) with infants randomized to consume peanut ingesting a median of 7.7 g peanut protein (interquartile range: 6.7 – 8.8 g)/week during the first 2 years of the trial compared to a median of 0 g in the avoidance group (see Text Box 2 for examples of peanut-containing foods utilized in the LEAP trial). While the outcome of the LEAP regimen was excellent, the study does not address use of alternative doses of peanut protein, minimal length of treatment necessary to induce the tolerogenic effect, or potential risks of premature discontinuation or sporadic feeding of peanut.
Rationale for Evaluating and Applying this Policy to a High-Risk Population
The LEAP study demonstrates that early peanut introduction can be successfully carried-out in a high-risk population (such as the population defined in the LEAP trial). However, without intervention by healthcare providers, there is the potential that such high-risk infants will remain at risk for delayed introduction of solids and allergenic foods into their diet, because of the widespread belief that such foods may exacerbate eczema.
There will be more extensive guidelines in the near future from the NIAID Working Group and EAACI Guidelines Group with their multidisciplinary stakeholders. These groups will consider all the available data and determine whether there is sufficient evidence to apply prevention strategies to the general population. However, engagement of the primary care, allergy and dermatology communities to rapidly implement these findings and change the culture of early feeding practices is essential, and the forthcoming NIAID Working Group’s and EAACI Guidelines Group’s documents will better clarify a best-practices approach.
- Nwaru BI, Hickstein L, Panesar SS, et al. The epidemiology of food allergy in Europe: a systematic review and meta-analysis. Allergy 2014;69:62-75.
- Osborne NJ, Koplin JJ, Martin PE, Gurrin LC, Lowe AJ, Matheson MC, et al. Prevalence of challenge-proven IgE-mediated food allergy using population-based sampling and predetermined challenge criteria in infants. J Allergy Clin Immunol. 2011;127:668-76.
- Venter C, Hasan Arshad S, Grundy J, et al. Time trends in the prevalence of peanut allergy: three cohorts of children from the same geographical location in the UK. Allergy 2010;65:103- 8.
- Sicherer SH, Muñoz-Furlong A, Godbold JH, Sampson HA. US prevalence of self-reported peanut, tree nut, and sesame allergy: 11-year follow-up. J Allergy Clin Immunol 2010;125:1322-6.
- Soller L, Ben-Shoshan M, Harrington DW, Fragapane J, Joseph L, St Pierre Y, et al. Overall prevalence of self-reported food allergy in Canada. J Allergy Clin Immunol. 2012;130:986-8.
- Amoah AS, Obeng BB, Larbi IA, Versteeg SA, Aryeetey Y, Akkerdaas JH, et al. Peanutspecific IgE antibodies in asymptomatic Ghanaian children possibly caused by carbohydrate determinant cross-reactivity. J Allergy Clin Immunol 2013;132: 639-47.
- DuToit G, Roberts G, Sayre PH, Bahnson HT, Radulovic S, Santos AF et al. Randomized trial of peanut consumption in infants at risk for peanut allergy. N Engl J Med 2015; 372:803-813.
- Greer FR, Sicherer SH, Burks AW; Effects of early nutritional interventions on the development of atopic disease in infants and children: the role of maternal dietary restriction, breastfeeding, timing of introduction of complementary foods, and hydrolyzed formulas. Pediatrics 2008: 121: 183-91.
- Muraro A, Halken S, Arshad SH, Beyer K, Dubois AE, Du Toit G, et al. EAACI food allergy and anaphylaxis guidelines. Primary prevention of food allergy. Allergy 2014; 69: 590-601.
- de Silva D, Geromi M, Halken S, Host A, Panesar SS, Muraro A, et al. Primary prevention of food allergy in children and adults: systematic review. Allergy 2014; 69: 581-9.
- Fleischer DM, Spergel JM, Assa'ad AH, Pongracic JA. Primary prevention of allergic diseases through nutritional interventions; J Allergy Clin immunol Pract 2013; 1: 29-36.
- Chan ES, Cummings C; Canadian Paediatric Society, Community Paediatrics Committee and Allergy Section. Dietary exposures and allergy prevention in high-risk infants: A joint statement with the Canadian Society of Allergy and Clinical Immunology. Paediatr Child Health. 2013;18:545-54.
- Agostoni C, Decsi T, Fewtrell M, Goulet O, Kolacek S, Koletzko B, Et al. Complementary feeding: a commentary by the ESPGHAN committee on nutrition. J Pediatr Gastroenterol Nutr 2008; 46: 99-110.
- Australasian Society of Clinical Immunology and Allergy (ASCIA). [Internet] ASCIA Infant Feeding Advice: Available from URL: http://www.allergy.org.au/images/stories/aer/infobulletins/2010pdf/ASCIA_Infant_Feeding_Ad vice_2010.pdf. (Accessed April 2, 2015)