Primary isolation of Salmonella spp. from stool on desoxycholate (deoxycholate) citrate agar.
Colorleless colonies with the black centers of Salmonella enterica subsp. enterica (lactose-negative, H2S-positive) on desoxycholate citrate agar. Desoxycholate-citrate agar is a moderately selective solid medium used to screen Salmonella spp. and Shigella spp. from clinical specimens. DX agar inhibits gram-positive microorganisms primarily to its content of sodium deoxycholate.