Most common cause of UTI in young females is?
**Core Concept**
The most common cause of urinary tract infections (UTIs) in young females is attributed to the presence of a specific type of bacteria that takes advantage of the female urinary tract's anatomy. The short female urethra provides a direct pathway for bacteria to enter the bladder, leading to infection.
**Why the Correct Answer is Right**
The correct answer is **Escherichia coli (E. coli)**, which is a gram-negative, rod-shaped bacterium commonly found in the human gut. E. coli can easily ascend the urethra and cause UTIs in young females due to the short female urethra and the proximity of the urethral meatus to the anus. This allows bacteria to contaminate the urinary tract and cause infection.
**Why Each Wrong Option is Incorrect**
**Option A:** Other bacteria such as Klebsiella pneumoniae, Staphylococcus saprophyticus, and Enterococcus faecalis can also cause UTIs, but they are less common in young females. E. coli is the most prevalent cause.
**Option B:** Candida albicans is a fungus that can cause urinary tract infections, particularly in immunocompromised individuals or those with indwelling catheters. However, it is not the most common cause in young females.
**Option C:** Pseudomonas aeruginosa is a gram-negative bacterium that can cause UTIs, particularly in hospital-acquired infections or in individuals with urinary catheters. However, it is not the most common cause in young females.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the most common cause of UTIs in young females is E. coli, and that the short female urethra provides a direct pathway for bacteria to enter the bladder. This knowledge can help guide appropriate antibiotic treatment and prevention strategies.
**Correct Answer:** D. Escherichia coli (E. coli)