// ============================================================
// FILE: theory/microbiology/UTI-microbiology/mcqs.js
// SUBJECT: Microbiology | CHAPTER: UTI Microbiology | DECK: MCQs
// ============================================================

var CARDS_Microbiology_UTIMicrobiology_Mcqs = [
{
  q: `A 68-year-old male with benign prostatic hyperplasia presents with high-grade fever, flank pain, and vomiting. A midstream urine culture grows a Gram-negative bacillus that is Indole-negative and Citrate-positive. Which virulence factor most likely allowed this specific organism to reach the renal parenchyma?
A. P fimbriae
B. Mannose-resistant fimbriae
C. Capsular K antigen
D. Urease production`,
  a: `C. Capsular K antigen

Capsular K antigen helps uropathogenic E. coli invade the renal parenchyma causing pyelonephritis.`
},

{
  q: `A 32-year-old female in her second trimester of pregnancy has an asymptomatic screening showing a bacterial count of 10³ CFU/mL of S. aureus from a midstream urine sample. What is the most appropriate interpretation of this finding?
A. Significant bacteriuria requiring treatment
B. Contamination; repeat the test
C. Normal commensal flora; no action needed
D. Significant only if the patient was symptomatic`,
  a: `A. Significant bacteriuria requiring treatment

In pregnancy and with Gram-positive pathogens, even low colony counts may be clinically significant.`
},

{
  q: `A patient with a long-standing indwelling catheter develops a UTI. Lab results show a Gram-negative bacillus that exhibits "swarming" on blood agar and produces a putrid odor. The patient is also found to have alkaline urine and a radio-opaque stone in the bladder. What is the biochemical basis for this stone formation?
A. Fermentation of lactose producing lactic acid
B. Breakdown of urea to form ammonia via urease
C. Production of P-fimbriae leading to epithelial scarring
D. Secretion of Secreted autotransporter toxin (SAT)`,
  a: `B. Breakdown of urea to form ammonia via urease

Proteus urease alkalinizes urine, promoting struvite stone formation.`
},

{
  q: `A 10-year-old child presents with "cola-colored" urine, hypertension, and facial edema two weeks after recovering from a skin infection. Laboratory tests show low C3 complement levels and elevated anti-DNase B titers. Which statement is TRUE regarding this condition?
A. It is a Type II hypersensitivity reaction
B. It is caused by pharyngitis-only strains of Group A Streptococcus
C. It results from the lodging of antigen-antibody complexes on the glomerular basement membrane
D. Long-term penicillin prophylaxis is indicated to prevent recurrence`,
  a: `C. It results from the lodging of antigen-antibody complexes on the glomerular basement membrane

PSGN is a Type III hypersensitivity caused by immune complex deposition.`
},

{
  q: `A 24-year-old male presents with a single, painless, beefy-red genital ulcer that bleeds easily on touch. He has no inguinal lymphadenopathy, but a "pseudobubo" is noted in the groin. A Giemsa-stained smear of the granulation tissue reveals large macrophages filled with safety-pin-appearing bacilli. What is the most likely diagnosis?
A. Primary Syphilis
B. Lymphogranuloma venereum (LGV)
C. Donovanosis
D. Chancroid`,
  a: `C. Donovanosis

Donovan bodies within macrophages are diagnostic of Donovanosis.`
},

{
  q: `A patient with a history of intravenous drug use and lepromatous leprosy tests "Reactive" on a screening VDRL test. However, the subsequent TPHA test is "Non-reactive." What is the clinical significance of this result?
A. The patient has early primary syphilis
B. The patient has a Biological False Positive (BFP)
C. The patient has neurosyphilis
D. The patient has latent syphilis`,
  a: `B. The patient has a Biological False Positive (BFP)

Reactive VDRL with negative TPHA indicates a biological false-positive result.`
},

{
  q: `A young man presents with mucopurulent urethral discharge and painful joints. On examination, he has conjunctivitis and skin lesions. A Gram stain of the discharge shows many pus cells but no organisms. He is found to be HLA-B27 positive. What is the nature of his condition?
A. Disseminated Gonococcal Infection (DGI)
B. Reiter’s Syndrome triggered by Chlamydia
C. Primary Syphilis with systemic spread
D. Acute Urethral Syndrome`,
  a: `B. Reiter’s Syndrome triggered by Chlamydia

Reactive arthritis is commonly triggered by Chlamydia in HLA-B27-positive individuals.`
},

{
  q: `A female patient presents with a malodorous, thin, white-to-gray vaginal discharge. The Whiff test is positive, and the vaginal pH is 5.5. Microscopy shows vaginal epithelial cells with granular appearance and indistinct borders. What is the most likely finding on a Gram-stained smear of this discharge?
A. Numerous jerky motile trophozoites
B. Budding yeast cells with pseudohyphae
C. A Nugent score of ≥7
D. Spectacle-shaped Gram-positive cocci`,
  a: `C. A Nugent score of ≥7

A Nugent score ≥7 confirms bacterial vaginosis on Gram stain.`
},

{
  q: `Why are Chlamydia trachomatis reticulate bodies (RB) referred to as "energy parasites"?
A. They destroy host mitochondria to obtain glucose
B. They cannot synthesize their own nucleic acids
C. They are the extracellular infective form that survives in low ATP
D. They depend entirely on host ATP for survival`,
  a: `D. They depend entirely on host ATP for survival

Reticulate bodies rely on host ATP despite synthesizing their own proteins and nucleic acids.`
},

{
  q: `A 30-year-old African man presents with terminal hematuria. A urine wet mount collected between 12 noon and 3 pm shows elliptical, non-operculated eggs with a sharp terminal spine. Which complication is this patient at highest risk for if left untreated?
A. Adenocarcinoma of the prostate
B. Squamous cell carcinoma of the bladder
C. Renal amyloidosis
D. Chronic glomerulonephritis`,
  a: `B. Squamous cell carcinoma of the bladder

Schistosoma haematobium infection predisposes to squamous cell carcinoma of the bladder.`
},
{
  q: `A 45-year-old male with a history of renal calculi presents with recurrent UTIs. A urine culture on CLED agar produces mucoid yellow colonies. Biochemical testing reveals the organism is Non-motile, Indole-negative, and Urease-positive. What is the most likely pathogen?
A. Escherichia coli
B. Proteus mirabilis
C. Klebsiella pneumoniae
D. Enterococcus faecalis`,
  a: `C. Klebsiella pneumoniae

Klebsiella is non-motile, urease-positive, indole-negative, and forms mucoid lactose-fermenting colonies.`
},

{
  q: `A clinician is trying to differentiate between a simple case of cystitis and early pyelonephritis in a patient with ambiguous symptoms. They order an Antibody-Coated Bacteria (ACB) test. If the test returns positive (fluorescence observed), what does this indicate about the infection's pathogenesis?
A. The bacteria have reached the bladder via the ascending route.
B. The infection is likely localized to the lower urinary tract.
C. The infection has reached the kidneys, likely via hematogenous seeding.
D. The patient has developed a Type III hypersensitivity reaction.`,
  a: `C. The infection has reached the kidneys, likely via hematogenous seeding.

Positive ACB test suggests upper UTI with renal involvement.`
},

{
  q: `A 60-year-old male is undergoing treatment for chronic prostatitis. Despite multiple rounds of antibiotics, he experiences recurrent bacteremia. What is the most likely reason for this clinical failure based on the pathophysiology of the prostate?
A. Prostatic fluid contains zinc which neutralizes common antibiotics.
B. High alkaline pH of the prostate inactivates beta-lactam drugs.
C. Antibiotics penetrate poorly into prostatic tissue.
D. The presence of a long urethra prevents the drug from reaching the site.`,
  a: `C. Antibiotics penetrate poorly into prostatic tissue.

Poor antibiotic penetration makes chronic prostatitis difficult to eradicate.`
},

{
  q: `In a patient suspected of having Renal Tuberculosis, the laboratory receives three consecutive early morning urine samples. The routine bacterial culture is negative despite the presence of significant pus cells (sterile pyuria). What is the next most appropriate step for a definitive diagnosis?
A. Perform a Griess (Nitrate reduction) test.
B. Centrifuge the deposit and culture on MGIT or LJ medium.
C. Order a PCR for BK virus.
D. Test the urine for Tamm-Horsfall protein levels.`,
  a: `B. Centrifuge the deposit and culture on MGIT or LJ medium.

Renal TB is confirmed by mycobacterial culture from concentrated early-morning urine.`
},

{
  q: `A patient presents with hematuria. The physician suspects a parasitic cause and requests a urine sample to be collected specifically between 12 noon and 3 pm. What is the biological rationale for this specific timing?
A. Trichomonas vaginalis trophozoites are only motile during peak daylight.
B. Dioctophyme renale larvae only penetrate the bladder during high metabolic activity.
C. Schistosoma haematobium egg excretion peaks during this timeframe.
D. Candida albicans requires higher afternoon temperatures for pseudohyphae formation.`,
  a: `C. Schistosoma haematobium egg excretion peaks during this timeframe.

S. haematobium eggs are shed maximally between noon and 3 pm.`
},

{
  q: `A 29-year-old male is treated for a purulent urethral discharge with a single dose of Ceftriaxone. Two weeks later, he returns with a new, mucoid discharge (Post-gonococcal urethritis). What is the most likely reason for this secondary presentation?
A. The initial N. gonorrhoeae strain was a penicillinase-producing (PPNG) strain.
B. The patient had a co-infection with Chlamydia trachomatis that was not covered by the cephalosporin.
C. He has developed Fitz-Hugh–Curtis syndrome.
D. The patient was re-infected with a multidrug-resistant strain from the same partner.`,
  a: `B. The patient had a co-infection with Chlamydia trachomatis that was not covered by the cephalosporin.

Post-gonococcal urethritis is commonly due to untreated Chlamydia co-infection.`
},

{
  q: `During a dark-ground microscopy (DGM) examination of a chancre, the technician observes spirochetes showing jerky, serpentine-like movements rather than the characteristic slow "corkscrew" rotation. How should this finding be interpreted?
A. Confirmed Treponema pallidum infection.
B. Technical error; the slide was not heated to 35°C.
C. Likely contamination with saprophytic spirochetes like T. refringens.
D. Early-stage Primary Syphilis before induration occurs.`,
  a: `C. Likely contamination with saprophytic spirochetes like T. refringens.

T. pallidum shows slow corkscrew motility, unlike jerky saprophytic spirochetes.`
},

{
  q: `A pregnant woman at her first antenatal visit tests "Reactive" on a screening VDRL. A subsequent FTA-ABS is also "Reactive." After successful treatment with Penicillin G, which of the following is true regarding her future monitoring?
A. Both VDRL and FTA-ABS will become non-reactive within 12 months.
B. The FTA-ABS will likely remain elevated for years regardless of clinical improvement.
C. Only the FTA-ABS should be used to monitor the response to treatment.
D. A fourfold increase in VDRL titer is expected immediately after treatment.`,
  a: `B. The FTA-ABS will likely remain elevated for years regardless of clinical improvement.

Treponemal tests usually remain positive for life despite adequate treatment.`
},

{
  q: `A 22-year-old female presents with malodorous vaginal discharge. The clinician performs a Gram stain and calculates a Nugent score of 8. What does this score specifically signify regarding her vaginal microflora?
A. A high concentration of Trichomonas trophozoites.
B. A shift from Lactobacillus dominance to Gardnerella and anaerobic dominance.
C. A high-risk of squamous cell carcinoma due to HPV types 6 and 11.
D. Significant infection with Chlamydia serovars L1–L3.`,
  a: `B. A shift from Lactobacillus dominance to Gardnerella and anaerobic dominance.

A Nugent score ≥7 indicates bacterial vaginosis with loss of lactobacilli.`
},

{
  q: `A patient presents with a painful bubo and a "groove sign" in the inguinal region. The physician suspects Lymphogranuloma venereum (LGV). Why is a biopsy of the lymph node contraindicated in this patient?
A. It may lead to the systemic spread of Chlamydia.
B. There is a high risk of permanent sinus tract (fistula) formation.
C. The Miyagawa corpuscles are only found in skin scrapings, not nodes.
D. LGV serovars L1–L3 are too delicate for histopathological staining.`,
  a: `B. There is a high risk of permanent sinus tract (fistula) formation.

Lymph node biopsy in LGV can result in chronic sinus formation.`
},
{
  q: `A 28-year-old pregnant woman in her first trimester is found to have a bacterial count of 10⁴ CFU/mL of Enterococcus faecalis in a routine screening of her midstream urine. She is currently asymptomatic. What is the most appropriate management according to the Kass concept?
A. Ignore the result as the count is below 10⁵ CFU/mL.
B. Repeat the culture using a suprapubic aspiration for confirmation.
C. Treat the infection as significant bacteriuria despite the low count and lack of symptoms.
D. Monitor for symptoms and only treat if dysuria or frequency develops.`,
  a: `C. Treat the infection as significant bacteriuria despite the low count and lack of symptoms.

Asymptomatic bacteriuria in pregnancy should be treated even with lower colony counts.`
},

{
  q: `A laboratory receives a urine sample from a patient with suspected pyelonephritis. The Gram stain shows Gram-negative bacilli, but the culture on CLED agar shows no growth after 24 hours. The patient’s history reveals they started a course of broad-spectrum antibiotics yesterday. Which of the following is true?
A. The Gram stain result should be dismissed as unreliable.
B. A count of <10⁴ CFU/mL would be considered significant in this patient.
C. The negative culture confirms the patient does not have a UTI.
D. The presence of pus cells is required to override the Kass threshold of 10⁵.`,
  a: `B. A count of <10⁴ CFU/mL would be considered significant in this patient.

Patients already on antibiotics may have significant UTI despite low colony counts.`
},

{
  q: `A 55-year-old male with a history of recurrent UTIs is found to have alkaline urine (pH 8.5) and "swarming" Proteus on blood agar. Imaging shows a large staghorn calculus. What specific pathogen-derived enzyme is responsible for the alkaline environment and subsequent stone formation?
A. Phenylalanine deaminase (PPA).
B. Catalase.
C. Urease.`,
  a: `C. Urease.

Proteus urease generates ammonia, alkalinizing urine and promoting struvite stones.`
},

{
  q: `A kidney transplant recipient presents with deteriorating renal function. A renal biopsy shows inflammatory infiltrates and tubular injury. Immunohistochemistry is positive for a double-stranded DNA virus. Which of the following is the most likely culprit?
A. Adenovirus serotype 11.
B. BK virus.
C. Cytomegalovirus (CMV).
D. Herpes Simplex Virus (HSV).`,
  a: `B. BK virus.

BK polyomavirus causes nephropathy in renal transplant recipients.`
},

{
  q: `A 24-year-old male presents with a purulent urethral discharge. Gram stain shows intracellular Gram-negative diplococci. He is treated with Ceftriaxone but returns 10 days later with a new, mucoid discharge. Which mechanism best explains the second presentation?
A. Resistance to Ceftriaxone in the original N. gonorrhoeae strain.
B. Simultaneous infection with C. trachomatis whose 7–10 day incubation period outlasted the Ceftriaxone.
C. Development of a Jarisch-Herxheimer reaction to the Ceftriaxone.
D. A Type IV hypersensitivity reaction to the initial bacterial antigens.`,
  a: `B. Simultaneous infection with C. trachomatis whose 7–10 day incubation period outlasted the Ceftriaxone.

Post-gonococcal urethritis is usually due to untreated Chlamydia co-infection.`
},

{
  q: `A 30-year-old woman presents with bilateral lower abdominal pain, fever, and right upper quadrant tenderness. Examination reveals adnexal swelling and "violin-string" adhesions between the liver and peritoneum. What is the most likely syndrome?
A. Reiter’s Syndrome.
B. Fitz-Hugh–Curtis Syndrome.
C. Puerperal Sepsis.
D. Water-can Perineum.`,
  a: `B. Fitz-Hugh–Curtis Syndrome.

PID-associated perihepatitis produces characteristic violin-string adhesions.`
},

{
  q: `Why are Reticulate Bodies (RB) of Chlamydia trachomatis considered "energy parasites"?
A. They lack the ability to synthesize nucleic acids and proteins.
B. They are the extracellular infective form that survives in low-ATP environments.
C. They can synthesize their own proteins and DNA but must use host ATP for energy.
D. They actively destroy host mitochondria to release glucose.`,
  a: `C. They can synthesize their own proteins and DNA but must use host ATP for energy.

Reticulate bodies depend on host ATP for metabolic energy.`
},

{
  q: `A clinician is using Amsel’s criteria to diagnose a patient with a thin, white homogeneous vaginal discharge. Which of the following combinations would confirm a diagnosis of Bacterial Vaginosis?
A. pH 4.0, Positive Whiff Test, and Strawberry cervix.
B. pH 5.0, Positive Whiff Test, and presence of Clue Cells.
C. pH 5.5, Negative Whiff Test, and presence of Trophozoites.
D. pH 4.0, Negative Whiff Test, and presence of Budding yeast.`,
  a: `B. pH 5.0, Positive Whiff Test, and presence of Clue Cells.

BV is diagnosed by Amsel criteria including pH >4.5, clue cells, and positive Whiff test.`
},

{
  q: `A 35-year-old man presents with a painless, indurated ulcer on his penis and bilateral, firm, non-suppurative lymphadenopathy. Dark-ground microscopy (DGM) shows spirochetes with a slow "corkscrew" motility. Which stage of Syphilis is this?
A. Primary Syphilis.
B. Secondary Syphilis.
C. Latent Syphilis.
D. Tertiary Syphilis.`,
  a: `A. Primary Syphilis.

A hard chancre with corkscrew-motile T. pallidum is characteristic of primary syphilis.`
},

{
  q: `In the laboratory diagnosis of LGV, why is a biopsy of the enlarged inguinal lymph node (bubo) generally avoided?
A. The Chlamydia serovars L1-L3 are too small to be seen in tissue.
B. There is a high risk of developing a chronic sinus tract or fistula.
C. Biopsy may trigger a systemic Jarisch-Herxheimer reaction.
D. The nodes are usually too firm to obtain a meaningful sample.`,
  a: `B. There is a high risk of developing a chronic sinus tract or fistula.

Lymph node biopsy in LGV can lead to persistent sinus formation.`
},
{
  q: `A 35-year-old farmer from the Nile River valley presents with terminal hematuria and dysuria. Microscopy of the urine collected between 12 noon and 3 pm reveals elliptical eggs with a sharp terminal spine. Which of the following is the most likely cellular mechanism leading to the patient's highest long-term risk?
A. Type III hypersensitivity leading to glomerulonephritis
B. Metaplastic changes in the urinary mucosa leading to squamous cell carcinoma
C. Continuous swarming of the pathogen causing renal calculi
D. Obstructive uropathy due to giant kidney worm larval migration`,
  a: `B. Metaplastic changes in the urinary mucosa leading to squamous cell carcinoma

Chronic Schistosoma haematobium infection causes squamous metaplasia predisposing to bladder SCC.`
},

{
  q: `A 22-year-old patient presents with urinary frequency and sterile pyuria (pus cells present, but no growth on routine media). The physician suspects Renal Tuberculosis. Which protocol is most accurate for confirming this diagnosis?
A. Perform a single midstream urine culture on CLED agar
B. Three consecutive early morning urine specimens for culture on MGIT or LJ medium
C. Urine wet mount to identify terminal spined eggs
D. Detection of antibody-coated bacteria using immunofluorescence`,
  a: `B. Three consecutive early morning urine specimens for culture on MGIT or LJ medium

Renal TB is confirmed by mycobacterial culture of three early-morning urine samples.`
},

{
  q: `A 40-year-old patient with a history of recurrent UTI presents with alkaline urine and a radio-opaque renal stone. The laboratory isolates a Gram-negative bacillus that is Indole-negative and Urease-positive. Which phenomenon observed on Blood Agar is characteristic of this organism?
A. Large mucoid pink colonies
B. Golden yellow hemolytic clusters
C. Concentric circles of growth (swarming)
D. Minute magenta pink colonies`,
  a: `C. Concentric circles of growth (swarming)

Proteus characteristically shows swarming motility on blood agar.`
},

{
  q: `In the laboratory diagnosis of UTIs, which of the following scenarios would justify treating a bacterial count of 10³ CFU/mL as "Significant Bacteriuria"?
A. A non-pregnant woman with no symptoms
B. A male patient with a high-protein diet
C. A symptomatic patient with an indwelling catheter
D. A school-aged girl during a routine screening`,
  a: `C. A symptomatic patient with an indwelling catheter

≥10³ CFU/mL is significant in symptomatic catheterized patients.`
},

{
  q: `A child presents with edema and hypertension two weeks after a skin infection (pyoderma). Lab tests show low complement levels and high anti-DNase B titers. Which statement regarding the prognosis and management of this condition is correct?
A. It is progressive and requires long-term penicillin prophylaxis
B. It is caused by the same M serotypes as Acute Rheumatic Fever
C. It usually results in spontaneous resolution with a good prognosis
D. It is a Type II hypersensitivity reaction to cardiac antigens`,
  a: `C. It usually results in spontaneous resolution with a good prognosis

PSGN usually resolves spontaneously and does not require long-term penicillin prophylaxis.`
},

{
  q: `A 26-year-old male presents with a purulent urethral discharge. Gram staining reveals intracellular Gram-negative kidney-shaped diplococci. Which specific protein on this pathogen’s outer membrane is most likely associated with the development of a Disseminated Gonococcal Infection (DGI)?
A. P fimbriae
B. PorB.1A
C. Capsular K antigen
D. Protein II (Opacity-associated)`,
  a: `B. PorB.1A

PorB.1A strains of N. gonorrhoeae are associated with disseminated infection.`
},

{
  q: `A patient is being screened for Syphilis. The clinician chooses the VDRL test over the RPR test. Which clinical scenario makes VDRL the preferred choice?
A. The clinician needs to read the result with the naked eye
B. The clinician is testing a Cerebrospinal Fluid (CSF) specimen for neurosyphilis
C. The patient is a pregnant woman at her third trimester visit
D. The clinic has a very low sample load and prefers individual testing`,
  a: `B. The clinician is testing a Cerebrospinal Fluid (CSF) specimen for neurosyphilis

VDRL is the recommended non-treponemal test for CSF in suspected neurosyphilis.`
},

{
  q: `A 28-year-old man has a painless, single, beefy-red genital ulcer that bleeds easily. He has an inguinal swelling that the physician identifies as a "pseudobubo." Which microscopic finding confirms the diagnosis?
A. "School of fish" arrangement of Gram-negative bacilli
B. Safety-pin appearing bacilli inside large macrophages
C. Corkscrew motility under dark ground microscopy
D. Tiny vesicular ulcers on a Giemsa stain`,
  a: `B. Safety-pin appearing bacilli inside large macrophages

Donovan bodies within macrophages confirm Donovanosis.`
},

{
  q: `A healthcare-associated UTI culture grows Gram-positive cocci in spectacle-shaped pairs that are Bile Esculin positive. The isolate is found to be resistant to vancomycin. What is the molecular mechanism of this resistance?
A. Secretion of penicillinase
B. Mutation in the phoE gene
C. Alteration of the D-alanyl-D-alanine side chain to D-alanyl-D-serine
D. Inactivation of the antibiotic by zinc in prostatic fluid`,
  a: `C. Alteration of the D-alanyl-D-alanine side chain to D-alanyl-D-serine

Van genes alter the vancomycin target, preventing drug binding.`
},

{
  q: `A patient presents with a painful inguinal bubo and the "groove sign." Which serovars of the causative agent are responsible for this systemic manifestation?
A. Serovars A, B, and C
B. Serovars D through K
C. Serovars L1, L2, and L3
D. Serovars 6 and 11`,
  a: `C. Serovars L1, L2, and L3

Lymphogranuloma venereum is caused by Chlamydia trachomatis serovars L1–L3.`
},
{
  q: `A 25-year-old sexually active female presents with a 2-day history of dysuria, increased frequency, and suprapubic pain. She denies fever or flank pain. Urinalysis reveals positive leukocyte esterase and negative nitrites. Which of the following is the most likely causative organism?
A. Escherichia coli
B. Proteus mirabilis
C. Staphylococcus saprophyticus
D. Klebsiella pneumoniae`,
  a: `C. Staphylococcus saprophyticus

S. saprophyticus is a common cause of cystitis in sexually active young women and is novobiocin resistant.`
},

{
  q: `A 69-year-old man comes to the emergency department with a 2-day history of fever, back pain, and a burning sensation with urination. He has a history of recurrent UTIs. His temperature is 39.1°C (102.3°F). Physical examination shows right flank tenderness. A urine culture grows a urease-positive organism that displays swarming motility on nonselective agar. Which of the following is the most likely causal organism?
A. Enterococcus faecalis
B. Escherichia coli
C. Proteus mirabilis
D. Pseudomonas aeruginosa`,
  a: `C. Proteus mirabilis

Proteus is urease-positive and shows characteristic swarming motility, causing alkaline urine and struvite stones.`
},

{
  q: `A 55-year-old hospitalized man with an indwelling urinary catheter develops a fever, flank pain, and cloudy urine. Urine culture grows a gram-negative rod that produces a blue-green pigment and a fruity, grapelike odor. Which of the following virulence factors promotes its resistance to multiple antibiotics?
A. Polysaccharide capsule
B. Exotoxin A
C. Endotoxin
D. Biofilm formation`,
  a: `D. Biofilm formation

Pseudomonas aeruginosa forms biofilms on catheters, increasing antibiotic resistance and persistence.`
},

{
  q: `A 26-year-old woman with a history of recurrent UTIs completes a 10-day course of broad-spectrum antibiotics for a recent infection. She now presents with vaginal itching and a thick, white, cottage cheese-like discharge. Which of the following is the most likely finding on microscopy?
A. Clue cells
B. Gram-negative diplococci
C. Budding yeast with pseudohyphae
D. Motile trichomonads`,
  a: `C. Budding yeast with pseudohyphae

Candida albicans causes vulvovaginal candidiasis and shows budding yeast with pseudohyphae on microscopy.`
},
{
  q: `The pathophysiology student identifies that the retrograde movement of this specific bacterium from the gut into the lower urinary tract is the most common infecting pathogen responsible for a UTI.
A. Staphylococcus saprophyticus
B. Klebsiella pneumoniae
C. Escherichia coli
D. Pseudomonas aeruginosa`,
  a: `C. Escherichia coli

E. coli causes about 80–85% of UTIs by ascending from the intestinal flora.`
},

{
  q: `Your patient was recently diagnosed with a UTI. As the nurse practitioner, you are assessing whether the patient has any improvement with their symptoms of hematuria. What question would you ask the patient?
A. Do you have pain when you urinate?
B. Are you urinating more frequently?
C. Is your urine cloudy?
D. Is there blood in your urine?`,
  a: `D. Is there blood in your urine?

Hematuria means the presence of blood in the urine.`
},

{
  q: `A patient wants to know if they are considered to have recurrent UTIs because they have had 2 UTIs within the past year, one in January and the other in September. What is your best response?
A. Yes, two UTIs in one year is recurrent UTI.
B. No, you would need 3 or more UTIs within the past year.
C. No, because this is considered a relapse.
D. No, because this is considered a reinfection.`,
  a: `B. No, you would need 3 or more UTIs within the past year.

Recurrent UTI is defined as ≥3 UTIs in 12 months or ≥2 within 6 months.`
},

{
  q: `A patient you are treating in the clinic asks what actions can help prevent urinary tract infections. All of the following are correct EXCEPT:
A. Wipe from front to back after using the restroom.
B. Wear tight-fitting clothing.
C. Empty your bladder after sexual intercourse.
D. Drink plenty of water.`,
  a: `B. Wear tight-fitting clothing.

Tight clothing traps heat and moisture, increasing bacterial growth and UTI risk.`
},

{
  q: `Which of the following patients is least likely to acquire a urinary tract infection?
A. A 24-year-old male with poor hygiene.
B. An immunocompromised patient.
C. A patient with diabetes mellitus.
D. A patient with an indwelling urinary catheter.`,
  a: `A. A 24-year-old male with poor hygiene.

Healthy young males have the lowest risk of UTI compared with the other groups.`
},
{
  q: `A 62-year-old man comes to the physician because of a 2-day history of fever, chills, and flank pain. Five days ago, he was catheterized for acute urinary retention. His temperature is 39.3°C (102.7°F). Physical examination shows right-sided costovertebral angle tenderness. Urine studies show numerous bacteria and WBC casts. Urine culture on blood agar grows mucoid, gray-white colonies. Urine culture on eosin methylene blue agar grows purple colonies with no metallic green sheen. Which of the following is the most likely causal pathogen?
A. Escherichia coli
B. Klebsiella pneumoniae
C. Pseudomonas aeruginosa
D. Proteus mirabilis
E. Staphylococcus saprophyticus`,
  a: `B. Klebsiella pneumoniae

Mucoid colonies with lactose fermentation but no metallic green sheen on EMB are characteristic of Klebsiella.`
},

{
  q: `A 62-year-old woman with type 2 diabetes mellitus is brought to the emergency room because of a 3-day history of fever and shaking chills. Her temperature is 39.4°C (103°F). Examination shows right costovertebral angle tenderness. Urinalysis reveals WBCs, WBC casts, and gram-negative rods. Kidney biopsy is most likely to show:
A. Polygonal clear cells filled with lipids and carbohydrates
B. Polymorphonuclear leukocytes in tubules
C. Tubular eosinophilic casts
D. Widespread granulomatous tissue and foamy macrophages
E. Cystic dilation of the renal medulla`,
  a: `B. Polymorphonuclear leukocytes in tubules

Acute pyelonephritis is characterized by neutrophilic infiltration of renal tubules and interstitium.`
},

{
  q: `A 76-year-old woman with worsening urinary incontinence has suprapubic tenderness. Urinalysis shows positive nitrites, leukocyte esterase, and 15 WBCs/HPF. What is the best next step?
A. Pelvic floor muscle training
B. Ultrasound scan of kidneys, urinary tract, and bladder
C. Cystoscopy
D. Urine culture
E. Start empirical antibiotic therapy`,
  a: `D. Urine culture

Complicated UTI in an elderly patient should be confirmed with urine culture before targeted therapy.`
},

{
  q: `A 26-year-old female develops dysuria and frequency after unprotected intercourse. Urinalysis shows positive leukocyte esterase, positive nitrites, trace protein, and urease test is negative. Which organism is most likely?
A. Enterobacter cloacae
B. Staphylococcus saprophyticus
C. Proteus mirabilis
D. Klebsiella pneumoniae
E. Escherichia coli`,
  a: `E. Escherichia coli

Nitrite-positive and urease-negative UTI is most consistent with Escherichia coli.`
},

{
  q: `A 33-year-old female presents with dysuria, fever, and right flank pain. Urinary sediment shows WBC casts and Gram-negative bacteria. What is the most likely diagnosis?
A. Appendicitis
B. Cystitis
C. Pyelonephritis
D. Acute Interstitial Nephritis
E. Pelvic Inflammatory Disease`,
  a: `C. Pyelonephritis

WBC casts with flank pain strongly indicate acute pyelonephritis.`
},

{
  q: `A patient presents with urethral discharge. Gram stain shows intracellular gram-negative diplococci. What is the causative organism?
A. Mycoplasma genitalium
B. Treponema pallidum
C. Chlamydia trachomatis
D. Neisseria gonorrhoeae`,
  a: `D. Neisseria gonorrhoeae

Intracellular Gram-negative diplococci are diagnostic of Neisseria gonorrhoeae.`
},

{
  q: `Which of the following is typically seen on ultrasound in acute pyelonephritis?
A. Decreased vascularity
B. Enlarged kidney with diffuse swelling
C. Localized hypoechogenic areas in the kidney
D. Fluid collection around the kidney`,
  a: `C. Localized hypoechogenic areas in the kidney

Acute pyelonephritis commonly appears as focal hypoechoic lesions on renal ultrasound.`
},

{
  q: `Most common organism causing UTI:
A. Escherichia coli
B. Klebsiella
C. Streptococci
D. Staphylococcus saprophyticus`,
  a: `A. Escherichia coli

E. coli is the leading cause of community-acquired urinary tract infections.`
},

{
  q: `A patient from the Ohio River valley presents with granulomatous prostatitis showing broad-based budding organisms on microscopy. What is the most likely infecting organism?
A. Escherichia coli
B. Histoplasma capsulatum
C. Pseudomonas aeruginosa
D. Blastomyces dermatitidis`,
  a: `D. Blastomyces dermatitidis

Broad-based budding yeast in the Ohio River valley is characteristic of Blastomyces dermatitidis.`
},

{
  q: `Which of the following disorders is more likely associated with Staphylococcus saprophyticus than Staphylococcus aureus?
A. Burns
B. Tension pneumothorax
C. Osteomyelitis
D. Acute cystitis`,
  a: `D. Acute cystitis

Staphylococcus saprophyticus is a common cause of acute cystitis in young women.`
},

{
  q: `All of the following statements are true regarding central nervous system infections, EXCEPT:
A. Prion infection causes spongiform encephalopathy
B. JC virus causes progressive multifocal leukoencephalopathy
C. Cytomegalovirus is a common cause of bilateral temporal lobe hemorrhagic infarction
D. Measles virus causes subacute sclerosing panencephalitis (SSPE)`,
  a: `C. Cytomegalovirus is a common cause of bilateral temporal lobe hemorrhagic infarction

HSV-1, not CMV, classically causes bilateral temporal lobe hemorrhagic encephalitis.`
},

{
  q: `A 35-year-old woman presents with fever and abdominal pain. Blood culture shows gram-negative rods that ferment lactose and produce indole. What is the most likely pathogen?
A. Escherichia coli
B. Proteus mirabilis
C. Klebsiella pneumoniae
D. Salmonella enterica`,
  a: `A. Escherichia coli

E. coli is lactose-fermenting and indole-positive.`
},

{
  q: `A 6-year-old boy has recurrent urinary tract infections. Imaging shows retrograde flow of urine from the bladder into the ureters. What is the most likely diagnosis?
A. Vesicoureteric reflux (VUR)
B. Urinary bladder diverticulum (UBD)
C. Vesicocolic fistula (VCF)
D. Urinary bladder hernia (UBH)`,
  a: `A. Vesicoureteric reflux (VUR)

Retrograde urine flow into the ureters defines vesicoureteric reflux.`
},

{
  q: `Which antibiotic is the most appropriate choice for treating a bedridden patient with catheter-related UTI and pneumonia?
A. Amoxicillin
B. Beta-lactam antibiotic with beta-lactamase inhibitor
C. 3rd generation cephalosporins
D. 2nd generation cephalosporins`,
  a: `C. 3rd generation cephalosporins

Third-generation cephalosporins provide good Gram-negative coverage for complicated infections.`
},

{
  q: `A woman with a urinary tract infection is prescribed a drug known to cause tendon rupture and arthropathy. What is its mechanism of action?
A. Ribosomal inhibition
B. Cell wall synthesis inhibition
C. Inhibition of folic acid synthesis
D. DNA gyrase inhibition`,
  a: `D. DNA gyrase inhibition

Fluoroquinolones inhibit DNA gyrase and topoisomerase IV.`
},


]