› "Bacterium bifidum" (Tissier 1900) Lehmann and Neumann 1927
› "Bacteroides bifidus" (Tissier 1900) Castellani and Chalmers 1919
› "Bifidibacterium bifidum" (Tissier 1900) Prevot 1938
› "Cohnistreptothrix bifidus" (Tissier 1900) Negroni and Fischer 1944
› "Lactobacillus bifidus type II" Weiss and Rettger 1938
› "Lactobacillus parabifidus" Weiss and Rettger 1938
› "Nocardia bifida" (Tissier 1900) Vuillemin 1931
› "Tissieria bifida" (Tissier 1900) Pribram 1929
› Actinobacterium bifidum
› Actinomyces bifidus
› Actinomyces parabifidus
› Bacillus bifidus
› Bacillus bifidus communis
› Bacterium bifidum
› Bacteroides bifidus
› Bifidibacterium bifidum
› Bifidobacterium bifidum (Tissier 1900) Orla-Jensen 1924
› Cohnistreptothrix bifidus
› Lactobacillus bifidus type II
› Lactobacillus parabifidus
› Nocardia bifida
› Tissieria bifida