Os pólens são grãos microscópicos destinados à fecundação das plantas. Determinadas espécies são levadas pelo ar numa época especifica chamada de período de polinização. Os grãos de pólens das plantas produzem alergia respiratória por inalação. A doença polínica é mais frequente nas regiões da Europa, Argentina e Estados Unidos. No Brasil e em todo o Brasil na época da Primavera.

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