BIOL 2421 Microbiology         Pathogenic Bacterial Taxonomy Overview         Dr. Weis

Domain Bacteria

   I.  Phylum Class Proteobacteria

            A. Alpha Proteobacteria

                        1) Order Rickettsiales

                                    a) Genus Ehrlichia

                                    b) Genus Rickettsia

                        2) Order Rhizobiales

                                    a) Genus Brucella

                                    b) Genus Bartonella

            B. Beta Proteobacteria

                        1) Order Burkholderiales

                                    Family Alcaligenaceae

                                                a) Genus Bordetella

                        2) Order Neisseriales

                                    a) Genus Neisseria

            C. Gamma Proteobacteria

                        1) Order Thiotrichales

                                    a) Genus Francisella

                        2) Order Legionellales

                                    a) Genus Legionella

                                    b) Genus Coxiella

                        3) Order Pseudomonales

                                    a) Genus Moraxella

                                    b) Genus Pseudomonas

                        4) Order Vibrionales

                                    Family Vibrionaceae

                                                a) Genus Vibrio

                                                b) Genus Plesimonas

                                                c) Genus Aeromonas

                        5) Order Enterobacteriales

                                    Family Enterobacteriaceae

                                                a) Genus Citrobacter

                                                b) Genus Enterobacter

                                                c) Genus Escherichia

                                                d) Genus Klebsiella

                                                e) Genus Proteus; Genus Providencia; Genus Morganella

                                                f) Genus Salmonella

                                                g) Genus Serratia

                                                h) Genus Shigella

                                                i) Genus Yersinia

                        6. Order Pateurellales

                                    Family Pasteurellaceae

                                                a) Genus Pasteurella

                                                b) Genus Hemophilus

            D. Delta Proteobacteria [no human pathogens]

            E. Epsilon Proteobacteria

                        1) Order Campylobacterales

                                    a) Genus Campylobacter

                                    b) Genus Helicobacter

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II. Phylum Frimicutes [Low G + C Gram Positive Bacteria]

            A. Class Clostridia

                        1) Order Clostridiales

                                    a) Genus Clostridia

            B. Class Mollicutes

                        1) Order Mycoplasmatales

                                    a) Genus Mycoplasmas

                                    b) Genus Ureoplasma

            C. Class Bacilli

                        1) Order Bacillales

                                    a) Genus Bacillus

                                    b) Genus Listeria

                                    c) Genus Staphylococcus

                        2)  Order Lactobacillales

                                    a) Genus Enterococcus

                                    b) Genus Lactobacillus

                                    c) Genus Streptococcus

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III. Phylum Class Actinobacteria [High G + C Gram Positive Bacteria]

             Order Actinomycetales

                        Suborder Corynebacteriineae

                                    Family Norcardiaceae : Genus Nocardia

                                    Family Mycobacteriaceae: Genus Mycobacterium

                                    Family Corynebacteriaceae: Genus Corynebacterium

                        Suborder Actinomycineae

                                    Family Actinomyceteaceae: Genus Actinomyces

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IV. Phylum Class Chlamydia

            A. Order Chlamydiales

                        1) Genus Chlamydia

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V. Phylum Class Spirochetes

            A. Order Spirochetales

                        1) Genus Borrelia

                        2) Genus Leptospira

                        3) Genus Treponema

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VI. Phylum Class Bacteroidetes

            A. Order Bacteriodales

                        1) Genus Bacteroides