Cell Shape

Characteristics

Genus

Family

Acid-fast rods

Ray-forming rods

Mycobacterium

Actinomyces, Nocardia

Streptomyces

Actinomycetales

Spiral organisms

motile

Treponema, Borrellia, Leptospira, Spirocheta

Spirochetales

Small pleomorphic;

lack rigid wall

Mycoplasma

Mollicutes

Small intracellular parasites

Rickettsiae, Coxiella,

Chlamydia

Rickettsiaceae

Chlamydiaceae

Intracellular parasites

bordeline with protozoa

Bartonella

Bartonellae