Proteus mirabilis

Proteus mirabilis is a **Gram-negative, facultatively anaerobic, rod-shaped bacterium** classified in the **Enterobacteriaceae** family, recognized for its **swarming motility** and **urease production**. This organism commonly inhabits the gastrointestinal tract, soil, and water, but is best known as a frequent cause of **urinary tract infections (UTIs)**, particularly in catheterized patients where it forms **biofilms** on medical devices, resulting in **catheter-associated urinary tract infections (CAUTIs)**. The bacterium's **urease activity** hydrolyzes urea to ammonia, increasing urine pH and promoting **struvite kidney stone formation**, which can enable recurrent infections. Its key virulence factors include **flagella for motility, fimbriae for adhesion, urease, toxins, and the ability to form crystalline biofilms**. Diseases associated with Proteus mirabilis include **UTIs, kidney stones, bacteremia, wound infections, pneumonia, osteomyelitis, neonatal meningitis, and others**. Because of **high rates of intrinsic and acquired antibiotic resistance, difficulty in eradicating biofilm-associated infection, and complications such as catheter blockage**, management of infections due to Proteus mirabilis presents substantial therapeutic challenges[1][3][6][7][8].

Other names

P. mirabilisNone (Proteus mirabilis is the standard name)

Inhibition of cell wall synthesis (e.g. β-lactams, cephalosporins, piperacillin, amoxicillin, ampicillin) Inhibition of DNA gyrase (e.g. ciprofloxacin) Inhibition of protein synthesis (e.g. aminoglycosides) Folic acid antagonism (e.g. trimethoprim-sulfamethoxazole)