Kết quả: VKKK thường gặp là: Bacteroides fragilis: 5 (36%); Peptostreptococcus spp: 3 (20%); Peptostreptococcus asaccharolyticus: 2 (13%); Bacteroides thetaitaomicron: 2 (13%); Bacteroides distasonic: 1 (6%); Eubacterium limosum: 1 (6%); Staphylococcus saccaroloficus: 1 (6%).