G.C. Selective Supplement with VCAT Antibiotic supplements G.C. Selective Supplement with VCAT Vancomycin. Colistin, Amphotericin, Trimehtoprim (V.C.A.T)E&O Laboratories Ltd VCAT Selective Supplement (LS0002) is an antibiotic supplement used to enhance the selective isolation of Neisseria gonorrhoeae and Neisseria meningitidis.