NEET-PG 2020 - Microbiology Practice Questions

Q: Which of the following is most likely to be acquired by traumatic inoculation?

Sporothrix schenckii. ***Sporothrix schenckii*** - **Sporothrix schenckii** causes **sporotrichosis** (rose gardener's disease), which is classically acquired through **traumatic inoculation** via thorns, splinters, or plant material contaminated with the fungus. - This dimorphic fungus exists in soil and vegetation, and the mode of transmission is characteristically associated with **gardeners, farmers, and florists** who experience penetrating injuries during their work. - Presents as lymphocutaneous infection with nodular lesions along lymphatic channels. *Histoplasma capsulatum* - Causes histoplasmosis and is endemic to certain regions (Ohio and Mississippi River valleys). - Primarily acquired through **inhalation of microconidia** from soil contaminated with bird or bat droppings, not through traumatic inoculation. - Presents as pulmonary infection in most cases. *Coccidioides immitis* - Causes coccidioidomycosis (Valley Fever) and is found in arid regions of southwestern United States. - Acquired through **inhalation of airborne arthroconidia** from disturbed soil, not through traumatic inoculation. - While rare cases of primary cutaneous infection can occur, inhalation remains the typical route. *Aspergillus fumigatus* - Ubiquitous environmental mold associated with decaying organic matter. - Primarily causes disease through **inhalation of conidia**, leading to allergic reactions, aspergilloma, or invasive aspergillosis in immunocompromised patients. - Not typically associated with traumatic inoculation as the primary mode of infection.

Q: Which of the following doesn't cause urethritis in males?

H. Ducreyi. ***H. Ducreyi*** - *Haemophilus ducreyi* is the causative agent of **chancroid**, a sexually transmitted infection characterized by painful **genital ulcers** and **lymphadenopathy**. - It does not primarily cause **urethritis**, which is inflammation of the urethra. *Trichomonas vaginalis* - **Trichomonas vaginalis** is a protozoan parasite that commonly causes **trichomoniasis**, a sexually transmitted infection. - In males, it can lead to **urethritis** with symptoms such as dysuria and urethral discharge. *Chlamydia trachomatis* - **Chlamydia trachomatis** is a very common bacterial cause of **urethritis** in males, often presenting with a **mucopurulent discharge** and dysuria. - It is frequently asymptomatic, making it a significant cause of undiagnosed sexually transmitted infections. *N. gonorrhoeae* - **Neisseria gonorrhoeae** is the bacterium responsible for **gonorrhea**, a well-known cause of **purulent urethritis** in males. - Symptoms typically include a profuse, **purulent urethral discharge** and painful urination.

Question 1

Which of the following is most likely to be acquired by traumatic inoculation?

Accepted Answer

Sporothrix schenckii

Answer

Coccidioides immitis

Answer

Histoplasma capsulatum

Answer

Aspergillus fumigatus

Question 2

Which of the following doesn't cause urethritis in males?

Accepted Answer

H. Ducreyi

Answer

Trichomonas vaginalis

Answer

Chlamydia trachomatis

Answer

N. gonorrhoeae

NEET-PG 2020 — Microbiology