The figures were described as "remarkable" by an expert in allergic disease from London's Royal Free Hospital.

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All the study participants had a family history of allergic disease such as eczema or asthma - making their children more likely to develop such illnesses.

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All the study participants had a family history of allergic disease such as eczema or asthma - making their children at higher risk of developing such illnesses themselves.

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GPs need to be given the tools to recognise allergic disease early and know how to diagnose and manage it or at least know when to refer on.

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"What (this study shows) is that there's something about what we're experiencing in the U.S. compared to many other countries that seems to really lead people to, or unmask, allergic disease, " he said.

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And foreign-born children whose parents were also born outside of the United States seemed to benefit from additional protection from these conditions: 18% of these children developed allergic disease compared with 33% of foreign-born children whose parents were born in the United States.

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When they compared place of birth with allergic-disease prevalence, the scientists found that children born outside of the United States were less likely to develop asthma or allergies compared with those born in the United States: 20% of foreign-born kids developed allergic diseases compared with 34% of the American-born children.

CNN: American kids have higher allergy risk

But some patients are too allergic to tolerate the stuff, and others too squeamish, in the wake of mad-cow disease, to want it under their skin.

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For example, the doctor could create an asthmatic patient with chronic heart disease who is taking a handful of certain drugs and is currently experiencing anaphylactic shock, a severe allergic reaction.

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