Cell Shape

Characteristics

Genus

Family

Cocci

cells in irregular clusters

staphylococcus

Micrococcus

Sarcina

Micrococcaceae

Cells in chains

Streptococcus

Leuconostoc

Streptococcaceae

Bacilli

Aerobic Sporing

Bacillus

Bacillaeceae

Anaerobic Sporing

Clostridium

Lactic fermentation

Lactobacillus

Lactobacillacaeae

Propionic fermentation

Propionibacterium

Propioni-bacteriaceae

Oxidative, weakly fermentative

Corynebacterium

Listeria

Erysipelothrix

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