Donovanosis is caused by:
**Core Concept**
Donovanosis, also known as granuloma inguinale, is a chronic bacterial infection of the genital region. It is caused by a specific bacterium that invades the mucous membranes and subcutaneous tissues, leading to granulomatous lesions.
**Why the Correct Answer is Right**
Donovanosis is caused by Klebsiella granulomatis, a gram-negative bacterium that was previously known as Calymmatobacterium granulomatis. The bacterium invades the mucous membranes of the genital region, causing ulceration and granulomatous inflammation. The lesions are characterized by their beefy-red appearance and friable texture, and they can spread to adjacent tissues if left untreated.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct bacterium that causes donovanosis. While various bacteria can cause genital infections, only Klebsiella granulomatis is associated with donovanosis.
**Option B:** This option is incorrect because it is a bacterium that causes a different type of sexually transmitted infection, chancroid.
**Option C:** This option is incorrect because it is a bacterium that causes another type of sexually transmitted infection, lymphogranuloma venereum.
**Clinical Pearl / High-Yield Fact**
Donovanosis is often misdiagnosed as other conditions, such as syphilis or chancroid, due to its similar appearance. However, it can be distinguished from these conditions by its characteristic beefy-red appearance and the presence of granulomatous inflammation.
**Correct Answer:** D. Klebsiella granulomatis