title: Extensively hydrolyzed formula (MA-mi) induced exacerbation of food protein-induced enterocolitis syndrome (FPIES) in a male infant.
abstract: BACKGROUND
  Food protein-induced enterocolitis syndrome (FPIES) is a severe, cell-mediated food allergy in which digestive symptoms such as severe vomiting and diarrhea are induced by cow's milk and/or soy protein in infants. Generally, a food-specific IgE is not detected, and FPIES may be caused by inadvertent exposure to allergenic foods.
  
  
  METHODS
  The patient in our case was a male infant in whom vomiting had been induced by ingestion of a cow's milk-based formula and bloody diarrhea had been caused by ingestion of breast milk during the neonatal period. Accidental ingestion of a new and extensively hydrolyzed casein/whey formula, MA-mi, caused watery diarrhea at 8 months of age, and FPIES was diagnosed based on these symptoms. In antigen-specific lymphocyte stimulation tests, New MA-1 was negative, but MA-mi and cow's milk antigens were positive. The only causative antigens were derived from cow's milk, and the symptoms were not induced by another extensively hydrolyzed casein formula, New MA-1. The patient grew and developed normally thereafter, and no symptoms were induced by solid food during the course of the condition.
  
  
  CONCLUSIONS
  MA-mi is likely to be used increasingly for allergic infants, but it is not necessarily a substitute for other hydrolyzed milk formulae in all cases, and care should be taken regarding its use and possible misuse.
authors.affiliation: Division of Infectious Diseases, Immunology and Allergy, Saitama Children's Medical Center, Saitama, Japan. t-kabuki@yb3.so-net.ne.jp
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Kabuki
authors.forename: Kosuke
authors.initials: K
authors.lastname: Joh
mesh_terms: D000818:Animals; D002364:Caseins / Q000009:adverse effects / Q000276:immunology; D004760:Enterocolitis / Q000276:immunology* / Q000473:pathology; D006801:Humans; D007223:Infant; D041943:Infant Formula / Q000737:chemistry; D008297:Male; D008892:Milk / Q000009:adverse effects / Q000276:immunology*; D016269:Milk Hypersensitivity / Q000276:immunology* / Q000473:pathology; D013577:Syndrome
chemical_list: D002364:Caseins; C475729:casein hydrolysate