Food protein-induced enterocolitis syndrome (FPIES) is a non-IgE-mediated food hypersensitivity that usually presents in infancy with profuse vomiting, sometimes accompanied by diarrhea. In the acute form, when food is ingested on an intermittent basis or following a period of avoidance, FPIES typically presents with profuse vomiting, diarrhea, and dehydration, starting 1–3 h following food ingestion . Increased neutrophil count, increased platelet count, and methemoglobulinemia may be observed. In the chronic form, when food is ingested frequently, FPIES presents with intermittent vomiting, diarrhea, weight loss, and failure to thrive [2▪]. FPIES is diagnosed based on history and typical symptoms that improve with food avoidance, and exclusion of other etiologies. Oral food challenge (OFC) remains the gold standard for FPIES diagnosis. The majority of patients with FPIES because of cow's milk and soy resolve within the first years of life; solid food FPIES or FPIES associated with positive food-specific IgE may have a more protracted course.
In 1940, Rubin  reported intestinal bleeding due to cow's milk allergy in newborns. Gryboski and Powell et al. [4–7] described infants presenting in the first 6 weeks of life with recurrent vomiting, bloody diarrhea, and abdominal distension while being fed with cow's milk-based formula. They appeared dehydrated and severely ill; sepsis evaluations were negative. Improvement was achieved with intravenous fluids or hydrolyzed casein-based formula, but not with soy-based formula. Feeding with the cow's milk-based formula caused recurrence of severe emesis within 1–3 h and elevation of the peripheral neutrophil count, peaking at about 6 h following food ingestion. Powell  characterized major features of the disorder, established criteria for the diagnosis of cow's milk-induced enterocolitis, and established a standard challenge protocol. Reports of series of infants with FPIES by Sicherer et al.  (16 patients) and Burks et al.  (43 patients) further characterized clinical features and refined food challenge protocols. Additional reports identified solid foods such as cereal grains, vegetables, meats, and fish as triggers for FPIES [11–19].
FPIES may present in either acute or chronic form, as discussed in detail in another article in this issue of Current Opinion in Allergy and Clinical Immunology [20–25,26▪▪]. There are no classic allergic symptoms from the skin or respiratory tract in either form of FPIES.
The most common triggers are cow's milk and soy formulas and rice in young infants. FPIES may also occur upon ingestion of solid foods, including grains (rice, oats, barley, corn), meat and poultry (beef, chicken, turkey), egg white, vegetables (white potato, sweet potato, squash, string bean), fruit (tomato), legumes (peanut, green pea, lentil), seafood (fish, crustaceans, molluscs, usually with onset in older children and adults), and the probiotic Saccharomyces boulardii [7,9,14,16,17,19,22,27–30].
It is generally accepted that ingestion of a food is necessary for sensitization and reaction to a food protein. Recently, a 5.5-month-old infant, exclusively breast-fed, who developed emesis and lethargy after chewing on the wrapper of a rice cake was reported . After reoccurrence of symptoms with introduction of rice into his diet, he was diagnosed with rice FPIES. The case suggests that sensitization in FPIES can occur through breast milk alone and that the food amount required to trigger FPIES reaction can be quite low.
PATHOPHYSIOLOGY OF FOOD PROTEIN-INDUCED ENTEROCOLITIS SYNDROME
The mechanisms through which FPIES develops are as yet unclear. FPIES is often considered to be a T-cell-mediated disorder; however, only a handful of studies [32–38] have investigated T cells in FPIES with inconclusive results (Table 1). Humoral responses in FPIES are not well understood.
Cell-mediated immune responses
While there is some evidence of T-cell proliferation upon stimulation with food antigens, the stimulation index is not consistently different from control, nonallergic subjects . It is hypothesized that T-cell activation by food allergens may mediate local intestinal inflammation through release of proinflammatory cytokines, causing increased intestinal permeability and fluid shifts [39,40]. This local inflammation may be mediated by activated peripheral mononuclear cells, increased TNF-α, and decreased expression of TGF-β receptors in the intestinal mucosa . However, baseline antigen absorption is normal and does not predispose to FPIES . Methomoglobinemia described in case of severe acute FPIES have been attributed to the local intestinal inflammation .
Neutrophils, platelets, and eosinophils
Powell reported leukocytosis with a left shift as a common finding for patients presenting with acute FPIES and included it as one of the diagnostic criteria. In the Powell study, peripheral blood neutrophil counts were elevated in all positive challenges, peaking at 6 h with a mean increase of 9900 cells/μl. These results were confirmed by subsequent studies . Neutrophils have also been found in stool mucous of FPIES patients. This increase in peripheral neutrophils is likely due to the secretion of different cytokines (TNF-α) and chemokines during the inflammatory reaction. Thrombocytosis was recorded in 63% of episodes in one recent Australian report . One possible explanation for this acute thrombocytosis is a response to epinephrine induced by stress, which can shift platelets from the spleen into the circulation. The potential contribution of neutrophils and platelets in FPIES pathophysiology requires further investigation.
Eosinophils are present throughout the gastrointestinal tract under physiologic conditions, except in the esophageal squamous mucosa. Eosinophil accumulation in the gastrointestinal tract is commonly found in many gastrointestinal disorders, including classic IgE-mediated food allergy, eosinophilic gastroenteropathies, food-induced proctocolitis, as well as inflammatory bowel diseases and gastroesophageal reflux . Clusters of eosinophils have been found in intestinal biopsies from infants with FPIES. In FPIES with chronic diarrhea, eosinophils and Charcot-Leyden crystals were detected with Hansel's stain. These findings are not specific for FPIES.
Humoral immune responses
Humoral responses are poorly characterized in FPIES. Jejunal biopsies reveal increased numbers of IgM- and IgA-containing plasma cells [36,44]. Elevated serum IgA and IgG antibodies to food proteins have been described in FPIES patients compared with a control group . A recent study  showed similar results with a trend for higher specific IgA antibody levels in children with milk FPIES. These studies demonstrated near absence of allergen-specific IgG4 in FPIES. IgG4 antibodies fix complement poorly and could have a protective role in competing with other antibody subclasses that activate complement. The relative lack of IgG4 in FPIES patients may be involved in the pathogenesis of the disease.
Systemic specific IgE antibody responses are generally absent in FPIES [9,23,37,40]. However, if skin tests are positive to the causal food, case series suggest that these patients have a decreased probability of developing tolerance . The relationship between IgE and non-IgE mechanisms in FPIES requires further study. The gastrointestinal inflammation caused by FPIES might enhance penetrability of food proteins and their presentation to the immune system with subsequent generation of food-specific IgE antibodies. Conversely, local intestinal mucosal IgE antibodies may facilitate antigen uptake and intestinal inflammation .
A recent case series of children with FPIES successfully treated with ondansetron during the supervised OFC raised questions about the role of serotonin signaling in FPIES . Ondansetron is a serotonin 5-HT3 receptor antagonist used mainly to treat nausea and vomiting, often following chemotherapy but also in viral gastroenteritis. It affects both peripheral and central nerves. Ondansetron reduces the activity of the vagus nerve, which deactivates the vomiting center in the medulla oblongata, and blocks serotonin receptors in the chemoreceptor trigger zone. The effectiveness of ondansetron suggests the potential for neural component in FPIES reactions and warrants further study.
The NIAID Food Allergy Guidelines recommend using the medical history and OFC to establish a diagnosis of FPIES . However, when history indicates that infants or children have experienced hypotensive episodes or multiple reactions to the same food, a diagnosis may be based on a convincing history and absence of symptoms when the causative food is eliminated from the diet. The original diagnostic criteria as proposed by Powell were as follows: exposure to the incriminating food elicits repetitive vomiting and/or diarrhea within 4 h, without any other cause for the symptoms; symptoms are limited to the gastrointestinal tract; avoidance of the offending protein from the diet results in resolution of symptoms; and a standardized OFC or isolated reexposure elicits the typical symptoms . In a review published in 2013, Miceli Sopo et al. [47▪] proposed criteria to aid the clinician in diagnosis, which include the following: less than 2 years of age at first presentation (not mandatory); exposure to trigger food elicits repetitive vomiting, pallor, and lethargy within 2–4 h, and usually last less than 6 h; absence of symptoms that suggest an IgE-mediated reaction; avoidance of offending protein from the diet results in resolution of symptoms; and recurrence of typical symptoms within 2–4 h of reexposure.
An International Working Group on Consensus Guidelines for FPIES has been formed under the auspices of the AAAAI Adverse Reactions to Food Committee and the International Association of Food Protein-induced Enterocolitis in 2013. The Expert panel is working on evidence-based guidelines for diagnosis and management of FPIES to improve the care provided for the patients with FPIES.
Though there are no pathognomomic laboratory or radiographic findings specific to FPIES, findings of an elevated white blood cell count with left shift and methemoglobinemia following food ingestion are consistent with FPIES.
Food-specific IgE and skin prick testing may be performed to provide complete evaluation for food sensitization, particularly when considering a food challenge. Though the majority of patients with FPIES have undetectable serum IgE at the time of diagnosis, 18–30% of FPIES patients may develop IgE-mediated food sensitivity to the same food at some point during their course [9,48], with some developing immediate-type symptoms of classic IgE-mediated food allergy.
In research studies, gastric juice analysis showing more than 10 leukocytes/hpf 3 h after a food challenge  and atopy patch testing (APT) have been evaluated in FPIES patients [50,51]. Diagnostic utility of these tests remains unclear. Jarvinen et al.  evaluated APT in 38 children with FPIES and undergoing OFC. They estimated sensitivity of 11.8% and specificity of 85.7%; at this time APT is not recommended for routine diagnosis of FPIES.
Infants with FPIES often present with multiple reactions and extensive evaluations before the diagnosis of FPIES is considered [24,27]. Delays in diagnosis of infants with FPIES may be due to nonspecific nature of symptoms and lack of classic allergic skin and respiratory symptoms, broad differential diagnosis (discussed in another article of this Current Opinion in Allergy and Clinical Immunology issue by Fiocchi ), relative lack of knowledge among physicians [54,55], and in the case of FPIES to solid foods, the perception that grains and vegetables are hypoallergenic.
ORAL FOOD CHALLENGE IN FOOD PROTEIN-INDUCED ENTEROCOLITIS SYNDROME
The OFC remains the gold standard for an initial diagnosis of FPIES as well as for monitoring the resolution of FPIES. The OFC is usually done in an open manner under physician supervision in a facility equipped for managing dehydration and allergic reactions (Table 2). In our practice, a peripheral intravenous line is placed before the challenge to secure immediate access for rapid intravenous fluid rehydration. Baseline complete blood count with differential is obtained immediately before the challenge. The challenge food amount is based on the food protein content and administered in three equal portions over 30 min, followed by minimum 4 h of observation prior to discharge. Patients who tolerated the challenge without any symptoms are usually discharged after 4 h from completing the ingestion of the food; a postchallenge blood sample is obtained for complete blood count with differential. Patients who reacted to the challenge are usually discharged when 6 h have passed since ingestion of the food and their symptoms have resolved. A postchallenge blood sample is obtained for complete blood count with differential at 6 h postchallenge to calculate the increase in peripheral blood neutrophils, which is one of the major criteria for challenge positivity, as proposed by Powell (Table 3). In recent experience, diarrhea during the acute reaction is seen in 20–40% of the patients and may be less common during the food challenge [42,48,56]. In addition, the magnitude of neutrophil count increase during the challenge seems to be less than 3500/mm3. These observations suggest that criteria for challenge positivity should be updated and revised based on these observations from a large number of the food challenges. The initial criteria were established based on the outcomes of 14 challenges in 9 infants with median age 36 days who had just recently removed the offending food from their diet and who were clearly at the peak of their disease . In our clinical practice, we do not perform challenges in infants. The challenge is usually delayed by 12–18 months from the most recent FPIES reaction; therefore, the magnitude of the inflammatory response could be lower. Cooperative efforts among the centers providing the challenges for patients with FPIES are needed to standardize the challenge criteria.
WHEN IS ADDITIONAL DIAGNOSTIC WORK UP NECESSARY?
In any doubtful situation, a confirmatory OFC should be performed to document the diagnosis of FPIES. Children who experience ongoing symptoms or failure to thrive despite progressive food restrictions and/or being exclusively fed with an elemental amino acid-based formula should be evaluated by a pediatric gastroenterologist to rule out other disorders in the gastrointestinal tract. If symptoms appear to be triggered by febrile illness and or there are any developmental delays, a metabolic work up may be advisable.
There appears to be confusion among the providers and the parents of children with chronic gastrointestinal symptoms regarding diagnosis of chronic FPIES. Based on our experience from a referral population, the diagnosis of chronic FPIES is considered when all other diagnostic labels do not fit; it is sometimes given to children with ongoing gastrointestinal symptoms that persist despite extensive dietary eliminations or while the child is exclusively fed with an amino acid-based formula. In such cases, supervised OFCs are necessary to confirm the diagnosis of FPIES and to avoid misdiagnosing other conditions (e.g. metabolic disorders, eosinophilic gastroenteropathies or gastrointestinal inflammatory diseases) as chronic FPIES. The FPIES phenotype had been originally defined in young infants reacting to milk or soy proteins. They had chronic symptoms of vomiting, diarrhea, sometimes with failure to thrive, and/or bloody stools while being fed with milk- or soy-based formulas in the first months of life. Following removal of the formula due to severe symptoms requiring hospitalization, symptoms resolved within a few days. However, subsequent reintroduction of the formula resulted in the typical pattern of acute FPIES, with the onset of emesis in 2–4 h following a feeding. While a recent study [26▪▪] reported a large subset presenting predominantly with chronic diarrhea without vomiting, the diagnosis of FPIES had not been confirmed by an oral challenge in these subjects. Chronic diarrheal phenotype of FPIES requires further validation by rigorous studies.
FPIES appears to be a more common condition than previously appreciated. Any food can cause FPIES, with the most common triggers being cow's milk, soy, and rice. Registries are needed to understand the phenotype, triggers, and prevalence of FPIES. OFC remains the gold standard for FPIES diagnosis. Multicenter studies are needed to validate the challenge procedure and positivity criteria. Research on the pathophysiology of FPIES reactions is necessary to develop an evidence-based approach to diagnosis and management of FPIES.
ANW reports receiving grant support from NIAID, FARE, Nestle, and Nutricia, royalties from UpToDate, honoraria from speaking engagements from Nestle and Thermofisher Scientific, and for advisory board activities from Merck and Stallergens.
Conflicts of interest
There are no conflicts of interest.
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Keywords:Copyright © 2014 Wolters Kluwer Health, Inc. All rights reserved.
allergic enterocolitis; food allergy; food protein-induced enterocolitis syndrome