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In the crystal structure of the title compound, [CuI(C5H5BrN2)]n, the Cu and I atoms form Cu–I polymeric double chains in which each Cu atom is coordinated by three I atoms and one N atom of a 2-amino-5-bromo­pyridine ligand in a distorted tetra­hedral geometry. The chains are linked by N—H⋯N hydrogen bonds, forming layers parallel to the (001) plane.