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Alergio, anke konocata kom alergiala morbo esas nenormala, ne-adaptita, exajerita o mem ecesanta reakto di imunologiala sistemo dil organismo, pos kontakto kun kelka substanci dil ambiento. On nominas alergeno irga substanco qua povas efektigar ca reakti en kelka individui, exemple poleno, polvo e kelka nutrivo.
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