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Congenital chloride diarrhea (CCD) is a rare autosomal recessive disease. It is caused by mutations in the SLC26A3 gene which encodes the transmembrane Cl-/HCO3- exchanger, mainly expressed in the apical epithelium of the ileum and colon. The result is defective intestinal absorption of Cl- and secretion of HCO3-, leading to watery Cl- -rich diarrhea. The first symptoms of CCD include polyhydramnios...