Question:
Which of the following organisms is NOT a cause of urethritis?
Which of the following organisms is NOT a cause of urethritis?
Show Hint
One of these makes a painful genital ulcer, not a urethral discharge, that is the odd one out.
Updated On: Jun 23, 2026
- Trichomonas vaginalis
- Haemophilus ducreyi
- Chlamydia trachomatis
- Gonococcus (Neisseria gonorrhoeae)
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Answer: Haemophilus ducreyi.
Step 1: Urethritis splits into gonococcal urethritis (Neisseria gonorrhoeae) and non-gonococcal urethritis. The leading non-gonococcal cause is Chlamydia trachomatis, with Trichomonas vaginalis, Mycoplasma genitalium and herpes simplex also implicated.
Step 2: So gonococcus, chlamydia and trichomonas are all well-recognised urethritis pathogens, ruling out options a, c and d.
Step 3: Haemophilus ducreyi behaves differently: it causes chancroid, a painful genital ULCER with tender suppurative inguinal nodes, not an inflamed urethra with discharge. That makes it the organism not involved in urethritis.
Ref: Jawetz Medical Microbiology, 27e, p. 746.
Step 1: Urethritis splits into gonococcal urethritis (Neisseria gonorrhoeae) and non-gonococcal urethritis. The leading non-gonococcal cause is Chlamydia trachomatis, with Trichomonas vaginalis, Mycoplasma genitalium and herpes simplex also implicated.
Step 2: So gonococcus, chlamydia and trichomonas are all well-recognised urethritis pathogens, ruling out options a, c and d.
Step 3: Haemophilus ducreyi behaves differently: it causes chancroid, a painful genital ULCER with tender suppurative inguinal nodes, not an inflamed urethra with discharge. That makes it the organism not involved in urethritis.
Ref: Jawetz Medical Microbiology, 27e, p. 746.
Was this answer helpful?
0
0
Top NEET PG Microbiology Questions
- A patient hailing from Delhi presents with fever, arthralgia, and extensive petechial rash for 3 days. Lab investigations revealed a hemoglobin of 9 g/ dL, a white blood cell count of 9000 cells/mm3, a platelet count of 20000 cells/mm3, and a prolonged bleeding time. The clotting time was normal. What is the most likely diagnosis?
- Which of the following statements is true about Trichomonas vaginalis?
- A lady from West Rajasthan presented with an ulcer surrounded by erythema on the right leg. Microscopy of the biopsy from the edge of the ulcer showed organisms with dark staining nuclei and kinetoplast. What is the most likely causative agent?
- A child presents with a fever and a rash. Urine examination showed cells with owl's eye appearance. What is the most likely diagnosis?
- Infection with Clonorchis sinensis is associated with an increased risk of__?
View More Questions
Top NEET PG Questions
- A patient hailing from Delhi presents with fever, arthralgia, and extensive petechial rash for 3 days. Lab investigations revealed a hemoglobin of 9 g/ dL, a white blood cell count of 9000 cells/mm3, a platelet count of 20000 cells/mm3, and a prolonged bleeding time. The clotting time was normal. What is the most likely diagnosis?
- Which of the following statements is true about Trichomonas vaginalis?
- A lady from West Rajasthan presented with an ulcer surrounded by erythema on the right leg. Microscopy of the biopsy from the edge of the ulcer showed organisms with dark staining nuclei and kinetoplast. What is the most likely causative agent?
- A child presents with a fever and a rash. Urine examination showed cells with owl's eye appearance. What is the most likely diagnosis?
- Infection with Clonorchis sinensis is associated with an increased risk of__?
View More Questions