In countries in North America and western Europe, where use of cow's milk based infant formula is common, chicken<unk>  is the second most common food allergy in infants and young children after cow's milk. However, in Japan,<unk>  is first and cow's milk second, followed by wheat and then the other common allergenic foods. A review from South Africa reported<unk>  and peanut as the two most common allergenic foods. 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.<unk> es are usually observed in infants and young children, and often disappear with age (see Prognosis), so prevalence of<unk>  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<unk>  in children under the age of five years is 1.8-2.0%. A second described the range in young children as 0.5-2.5%. 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<unk> -specific serum IgE, robust response to the skin prick test and absence of tolerance to<unk> -containing baked foods. 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<unk>  and 0.2% for confirmed. 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<unk>  was under 0.2%. Adult-onset of<unk>  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<unk>  dust.
Egg allergy
Corn allergy
Milk allergy
Latex allergy
Poultry allergy
Peanut allergy
Shellfish allergy
Fruit allergy