Which organism is characterized by the biochemical reactions: Urease Positive, Phenylalanine deaminase Positive, Citrate Positive, Motility Positive?

The organism characterized by being Urease Positive, Phenylalanine deaminase Positive, Citrate Positive, and Motility Positive is indeed Proteus mirabilis. This species of bacteria is well-known for its unique biochemical properties that help differentiate it from other enteric organisms.

Urease positivity indicates that the organism can hydrolyze urea to ammonia, leading to an increase in pH, which is significant in the diagnosis of urinary tract infections caused by this pathogen. Proteus mirabilis is often found in such cases, as its urease activity contributes to struvite stone formation in the urinary tract.

The presence of phenylalanine deaminase means that the organism can deaminate phenylalanine to phenylpyruvic acid, which is an important characteristic of Proteus species. This property is often tested in the laboratory to confirm the identity of the organism.

Citrate utilization suggests that the organism can use citrate as its sole carbon source, which is a typical feature of several Enterobacteriaceae, including Proteus mirabilis. This is often observed in the citrate agar test used for differentiating species within the group.

Finally, motility positivity indicates that Proteus mirabilis is motile due to its flag