Which of the following are the most common pathogens causing Urinary Tract Infections (UTIs)?
Proteus mirabilis
Escherichia coli
Staphylococcus saprophyticus
Klebsiella peumoniae
The Correct Answer is B
A. Proteus mirabilis: While Proteus mirabilis is a recognized cause of UTIs, especially in catheterized patients or those with structural abnormalities, it is not the most common pathogen overall.
B. Escherichia coli: E. coli is by far the most common pathogen responsible for urinary tract infections, accounting for approximately 80–90% of uncomplicated UTIs due to its ability to adhere to the uroepithelium with fimbriae.
C. Staphylococcus saprophyticus: This organism is a common cause of UTIs in sexually active young women, but overall it is much less prevalent than E. coli across all age groups and sexes.
D. Klebsiella pneumoniae: Although K. pneumoniae can cause UTIs, particularly in hospitalized or immunocompromised patients, it is not as frequently encountered as E. coli in community-acquired cases.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C","E"]
Explanation
A. Itching: Pruritus typically develops during the icteric phase of hepatitis when bilirubin accumulates in the tissues. It is not considered an early or prodromal symptom but occurs later as jaundice becomes evident.
B. Vomiting: Nausea and vomiting are common prodromal symptoms of hepatitis due to liver inflammation and its impact on digestion. These gastrointestinal symptoms often occur before jaundice or other late signs become apparent.
C. Fatigue: Fatigue is one of the most frequently reported early symptoms of hepatitis. It results from the body's immune response and reduced liver function and may begin days or weeks before jaundice or dark urine appears.
D. Jaundice: Jaundice typically marks the transition to the icteric phase of hepatitis and follows the prodromal phase. It appears as liver dysfunction progresses and bilirubin accumulates in the bloodstream and tissues.
E. Hyperalgia (increased sensitivity to pain): Increased pain sensitivity, particularly in the upper right quadrant, can occur early in hepatitis due to liver inflammation. This symptom may accompany general malaise and precedes more visible signs like jaundice.
Correct Answer is D
Explanation
A. Low-residue diet predisposes to colon diverticula: A low-fiber (low-residue) diet leads to harder stools and increased intraluminal pressure during bowel movements, which promotes the formation of diverticula, especially in the sigmoid colon.
B. Diverticulum may become infected, causing diverticulitis: When fecal material becomes trapped in a diverticulum, it can lead to localized infection and inflammation known as diverticulitis, which may cause pain, fever, or even abscess formation.
C. Ulceration of lining of diverticula caused by fecal material in the diverticula may cause bleeding from the ulcerated diverticulum: Trapped fecal matter can irritate and ulcerate the mucosal lining of diverticula, leading to localized bleeding, which may be seen as rectal bleeding or blood in the stool.
D. Diverticula predispose to colon carcinoma: Diverticulosis is not considered a premalignant condition. Although both conditions may coexist in older adults, the presence of diverticula does not increase the risk of colon cancer.
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