Bacterial taxonomy

No cell wall - Mycoplasma, gram +

Spiral: gram -  Leptospira, Borrelia, Treponema

Pleomorphic: gram - Rickettsia, Chlamydia

Branching filamentous: gram + Actinomyces, Nocardia (weakly acid fast)


Rods gram +  Clostridium, Corynebacterium, Bacillus, Listeria, Mycobacterium

Rods gram -    E. coli,  Shigella, Salmonella, Yersinia, Klebsiella, Proteus,  Enterobacter, Serratia, Vibrio, Campylobacter, Helicobacter, Pseudomonas, Bacteroides.
                         Haemophilus, Legionella, Bordetella, Fransiella, Brucella, Pasterurella,
                          Bartonella, Gardnerella.

Cocci  gram +   Staphilococcus, Streptococcus

Cocci gram -     Neisseria