Question 1

Which of the following is a major innate defense mechanism of the urinary tract that helps prevent microbial colonization?

Accepted Answer

Flushing action of urine

Question 2

A female patient presents with recurrent urinary tract infections. Which anatomical feature increases her risk compared to males?

Accepted Answer

Urethra in close proximity to the anus

Question 3

Which of the following best describes the role of Lactobacillus species in the female genital tract during childbearing years?

Accepted Answer

They ferment glycogen to acid, lowering vaginal pH and inhibiting pathogens

Question 4

A patient is diagnosed with cystitis. Which of the following signs is most characteristic of this condition?

Accepted Answer

Burning pain during urination (dysuria)

Question 5

Which microorganism is responsible for approximately 80% of community-acquired urinary tract infections?

Accepted Answer

Escherichia coli

Question 6

A patient with gonorrhea is found to have scar tissue in the spermatic ducts. What is the most likely consequence?

Accepted Answer

Infertility due to blocked spermatic ducts

Question 7

Which virulence factor of Neisseria gonorrhoeae allows it to evade the host immune response by changing its surface proteins?

Accepted Answer

Phase and antigenic variation of fimbriae

Question 8

A newborn develops conjunctivitis after passing through the birth canal of an infected mother. Which two pathogens are most commonly implicated?

Accepted Answer

Neisseria gonorrhoeae and Chlamydia trachomatis

Question 9

Which of the following statements about Chlamydia trachomatis is correct?

Accepted Answer

It alternates between elementary body and reticulate body stages

Question 10

A patient presents with a painless hard chancre at the site of entry of a pathogen. Which stage of syphilis is this, and what is the causative agent?

Accepted Answer

Primary syphilis; Treponema pallidum

Question 11

Which of the following is a diagnostic indicator for bacterial vaginosis caused by Gardnerella species?

Accepted Answer

Clue cells covered with adherent bacteria

Question 12

A patient with chronic genital herpes experiences frequent recurrences. Which factor is most likely responsible for viral latency?

Accepted Answer

MicroRNAs suppressing HSV genome transcription

Question 13

Which of the following is the recommended treatment for vaginal candidiasis?

Accepted Answer

Topical or oral azole drugs

Question 14

A patient with syphilis develops cardiovascular complications due to damage to the aortic cell wall. Which stage of syphilis is this?

Accepted Answer

Tertiary syphilis

Question 15

Which of the following is a common sequela of untreated Chlamydia infection in females?

Accepted Answer

Pelvic inflammatory disease (PID)

Question 16

A patient with bacterial vaginosis is found to have a higher vaginal pH than normal. What is the most likely explanation?

Accepted Answer

Shift from 'good' bacteria to 'bad' bacteria such as Gardnerella

Question 17

Which equation best represents the binary fission process of Chlamydia reticulate bodies inside host cells?

Accepted Answer

$$N_t = N_0$ 	imes 2^n$$

Question 18

Which of the following is NOT a recommended prevention strategy for syphilis?

Accepted Answer

Annual screening of young females

Question 19

A patient with Trichomonas vaginalis infection is at increased risk for which of the following complications?

Accepted Answer

Premature labor and low-birth-weight infants

Question 20

Which of the following is the gold standard for diagnosing Chlamydia infection?

Accepted Answer

Nucleic acid amplification tests (NAAT)

Infectious Diseases of the Genitourinary System: Microbiology and Clinical Implications

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