Comamonas acidovorans is a gram negative, rod-shaped bacterium. Davis and Park changed the name from Pseudomonas acidovorans to C. acidovorans in 1962. The reason for the change could not be found during research. This bacterium is a strict aerobe and a non-fermenter. It has a polar tuft of flagella (usually one or more) and is typically non-pigmented. It is a seemingly unusual bacterium in that it does not grow well on the typical simple sugars, instead preferring to feast on amino acids, peptone, and various organic acids for optimum growth. C. acidovorans does not have the ability to produce the enzyme glucose dehydrogenase so it cannot break down compound like glucose and 2-ketogluconate easily. Geographically C. acidovorans has been found in Japan, the Netherlands, Great Britain, the USA, Spain and Sweden. Due to its unusual “diet” it requires a selective enrichment medium and grows optimally at 30o C. The colonies are round and convex with a smooth to granular surface. The colonies are usually colorless but rarely exhibit a dark brown color in its colonies.