Struvite calculi in the urinary system are commonly associated with which microorganism?

Struvite calculi in the urinary system are commonly associated with which microorganism?

• A. Escherichia coli
• B. Proteus mirabilis
• C. Streptococcus pneumoniae
• D. Clostridium difficile

Answer: (B)

Struvite calculi, also known as magnesium ammonium phosphate stones, are commonly associated with urinary tract infections caused by certain bacteria that produce urease. Proteus mirabilis is a well-known urease-producing organism, which means it can hydrolyze urea into ammonia and carbon dioxide. The increased ammonia raises the urine pH, leading to an alkaline environment that promotes the formation of struvite stones. The presence of Proteus mirabilis in the urinary system leads to the precipitation of struvite crystals and subsequently the development of these calculi. This microorganism is frequently encountered in individuals who suffer from recurrent urinary tract infections, particularly in those with kidney stones or other urinary tract abnormalities. In contrast, the other options listed are not typically associated with the formation of struvite calculi. Escherichia coli, although a common cause of urinary tract infections, does not produce urease and therefore does not contribute to the development of struvite stones. Streptococcus pneumoniae and Clostridium difficile are not relevant in this context, as they are not usually implicated in urinary tract infections or in the formation of urinary stones. Thus, Proteus mirabilis is the correct choice due to its direct role in struvite calculus

Struvite calculi, also known as magnesium ammonium phosphate stones, are commonly associated with urinary tract infections caused by certain bacteria that produce urease. Proteus mirabilis is a well-known urease-producing organism, which means it can hydrolyze urea into ammonia and carbon dioxide. The increased ammonia raises the urine pH, leading to an alkaline environment that promotes the formation of struvite stones.

The presence of Proteus mirabilis in the urinary system leads to the precipitation of struvite crystals and subsequently the development of these calculi. This microorganism is frequently encountered in individuals who suffer from recurrent urinary tract infections, particularly in those with kidney stones or other urinary tract abnormalities.

In contrast, the other options listed are not typically associated with the formation of struvite calculi. Escherichia coli, although a common cause of urinary tract infections, does not produce urease and therefore does not contribute to the development of struvite stones. Streptococcus pneumoniae and Clostridium difficile are not relevant in this context, as they are not usually implicated in urinary tract infections or in the formation of urinary stones. Thus, Proteus mirabilis is the correct choice due to its direct role in struvite calculus