Bacterial Skin Infections Practice Questions

Q: Incubation period of LGV:

1 month. ***1 month*** - The incubation period for the primary lesion (a small, painless papule or vesicle) in **lymphogranuloma venereum (LGV)** is typically **1-4 weeks**, with 1 month being a common estimate [1]. - This primary lesion often goes unnoticed as it heals rapidly, usually within a few days [1]. *15-45 days* - While technically encompassing the range, **15-45 days** might be seen as slightly broad or less precise than the more common "1 month" estimate for the primary lesion. - The more prominent secondary stage with lymphadenopathy typically develops a few weeks after the primary lesion [1]. *6 months* - An incubation period of **6 months** is far too long for LGV. The disease characteristics usually manifest within weeks. - Such a long incubation period would suggest a different type of infection or a very delayed presentation, which is not characteristic of typical LGV. *3-12 days* - An incubation period of **3-12 days** is too short for LGV. This timeframe is more typical for diseases like **genital herpes** or **chancroid** [1]. - LGV caused by *Chlamydia trachomatis* serovars L1, L2, or L3, generally has a longer incubation before the primary lesion appears.

Q: Secondary syphilis is characterised by all except (choose the MOST appropriate answer)

Gummatous ulcers. ***Gummatous ulcers*** - **Gummas** are characteristic lesions of **tertiary syphilis**, not secondary syphilis. - They are granulomatous lesions that can affect various organs, including skin, bone, and internal organs. *Cutaneous coppery rashes* - **Coppery (or ham-colored)** macular or papular rashes are a hallmark of **secondary syphilis**, commonly appearing on the trunk, palms, and soles [1]. - These rashes are typically non-itchy and can resolve spontaneously without treatment [1]. *Moth - eaten alopecia* - **Patchy, non-scarring alopecia**, often described as "moth-eaten," is a common manifestation of **secondary syphilis** [2]. - It results from diffuse hair loss due to inflammatory infiltrates around hair follicles. *Ivory sequestrum* - **Skeletal gummas** in **tertiary syphilis** can result in bone necrosis, leading to the formation of an **ivory sequestrum**, which is a dead piece of bone. - This is a feature of **tertiary syphilis** and not seen in the secondary stage.

Q: Not a cutaneous manifestation of TB:

Lupus pernio. ***Lupus pernio*** - **Lupus pernio** is characteristic of **sarcoidosis**, not tuberculosis. It typically presents as violaceous, indurated plaques on the face, especially the nose, cheeks, and ears. - Its presence usually indicates chronic and systemic sarcoidosis, differentiating it from tubercular skin manifestations. *Erythema nodosum* - **Erythema nodosum** can be a cutaneous manifestation of tuberculosis, often indicating an underlying immune response to the infection. - It presents as tender, red nodules, typically on the shins, reflecting a delayed hypersensitivity reaction. *Scrofuloderma* - **Scrofuloderma** is a direct cutaneous manifestation of tuberculosis, resulting from the extension of an underlying tuberculous infection (e.g., lymph nodes, bones) to the skin. - It involves painless, purplish nodules or plaques that ulcerate and discharge pus. *Lupus vulgaris* - **Lupus vulgaris** is a chronic and progressive form of cutaneous tuberculosis, characterized by reddish-brown plaques with an "apple-jelly" appearance on diascopy. - This manifestation occurs due to hematogenous or lymphatic spread of **Mycobacterium tuberculosis** to the skin in individuals with moderate immunity.

Q: Moth-eaten alopecia is seen with:

Syphilis. ***Syphilis*** - **Moth-eaten alopecia** is a characteristic but non-specific finding in **secondary syphilis**, occurring due to immune-mediated inflammation targeting hair follicles. - It presents as patchy, non-scarring hair loss, predominantly on the scalp, eyebrows, and beard area. *Cylindroma* - **Cylindroma** is a benign adnexal tumor of the skin, typically presenting as multiple fleshy nodules on the scalp and face. - It is not associated with hair loss patterns like moth-eaten alopecia; rather, large lesions can cause pressure atrophy of hair follicles leading to localized hair loss. *Fungal infection* - **Fungal infections** of the scalp, such as tinea capitis, typically cause patches of **scaling, erythema, and broken hairs**, sometimes leading to **black dot tinea**. - While they can cause patchy hair loss, the description of "moth-eaten" is not the characteristic presentation for fungal infections. *Leprosy* - **Leprosy** can cause hair loss, particularly loss of the **lateral eyebrows** (madarosis) and body hair. - This hair loss is typically due to nerve damage leading to atrophy of hair follicles or direct granulomatous infiltration, not diffuse patchy "moth-eaten" alopecia.

Q: False about syphilis is :

Syphilitic ulcers(Chancre) are extremely painful. ***Syphilitic ulcers (Chancre) are extremely painful*** - **Syphilitic chancres** are typically **painless** ulcers, which is a key diagnostic feature differentiating them from other genital ulcers [1]. - The absence of pain often leads individuals to delay seeking medical attention, contributing to disease progression. *Secondary syphilis is due to hematological dissemination* - **Secondary syphilis** arises from the **hematogenous (bloodstream) and lymphatic dissemination** of Treponema pallidum throughout the body [1]. - This widespread dissemination accounts for the **systemic symptoms** and mucocutaneous lesions observed in secondary syphilis [1]. *"General paresis of Insane" is due to CNS involvement in tertiary syphilis.* - **General paresis of the insane** (or **paretic neurosyphilis**) is a manifestation of **tertiary neurosyphilis**, resulting from chronic inflammation and atrophy of the brain parenchyma. - It leads to progressive **cognitive decline, personality changes, and neurological deficits** due to central nervous system (CNS) damage by the spirochete. *Incubation period is 9-90 days* - The **incubation period** for syphilis, from exposure to the appearance of a **chancre**, typically ranges from **9 to 90 days**, with an average of about 21 days. - This variability depends on factors such as the inoculum size and the individual's immune response.

Q: All of the following organs may be involved in Leprosy except -

Uterus. ***Uterus*** - The **uterus** is generally considered resistant to infection by *Mycobacterium leprae* due to its internal environment and typical host immune responses. - Leprosy primarily affects tissues with a **lower core body temperature**, and the uterus does not fit this criterion. *Eye* - Ocular involvement in leprosy is common, particularly in **lepromatous leprosy**, and can lead to significant morbidity including blindness. [1] - Complications can include **keratitis**, **iritis**, and lagophthalmos due to facial nerve damage. [1] *Nasal mucosa* - The **nasal mucosa** is a very common site of early involvement in leprosy, often serving as a primary entry point and shedding site for the bacteria. - Chronic nasal obstruction, epistaxis, and ultimately nasal septal perforation and **saddle nose deformity** can occur. [1] *Testes* - The **testes** are frequently affected in lepromatous leprosy, as the cooler temperature of the scrotum creates a favorable environment for *M. leprae*. - Testicular involvement can lead to **atrophy**, infertility, and hypogonadism due to inflammation and destruction of testicular tissue. [1]

Q: Which of the following drugs can produce dramatic improvement in patients with type 2 lepra reaction?

Thalidomide. **Thalidomide** - **Thalidomide** is highly effective in managing **type 2 lepra reactions (erythema nodosum leprosum)**, leading to rapid resolution of symptoms. - Its anti-inflammatory and immunomodulatory properties directly address the inflammatory cascade characteristic of this reaction. *Steroids* - While **steroids** are effective in treating **type 1 lepra reactions** and severe type 2 reactions, they do not produce the same dramatic, rapid improvement seen with thalidomide in typical type 2 reactions. - Long-term steroid use carries significant side effects, making them less ideal for primary management of type 2 reactions when thalidomide is available. *Dapsone* - **Dapsone** is a crucial component of **multi-drug therapy (MDT)** for leprosy itself, but it does not treat reactions. - It has no significant anti-inflammatory effect on the acute immune-mediated processes of lepra reactions. *Clofazimine* - **Clofazimine** is an anti-inflammatory drug used in lepromatous leprosy treatment and sometimes as an alternative for steroid-resistant type 2 reactions. - However, its effect is generally slower and less dramatic compared to thalidomide in the acute management of typical type 2 lepra reactions.

Q: Secondary syphilis occurs after:

6 weeks. 6 weeks - **Secondary syphilis** typically manifests about **6 to 8 weeks** after the appearance of the primary chancre, making 6 weeks a common presentation window [1]. - This stage is characterized by systemic symptoms such as a **rash**, **lymphadenopathy**, and **constitutional symptoms**, indicating dissemination of the bacteria [1]. *13 weeks* - While secondary syphilis can *persist* for several weeks, its onset is usually earlier than **13 weeks**. Without treatment, the rash may last for up to 12 weeks [1]. - A duration of **13 weeks** might encompass the later phases of secondary syphilis or the transition to latent syphilis. *9 weeks* - **9 weeks** falls within the typical timeframe for secondary syphilis, but **6 weeks** is a more precise and common initial presentation. - The range for secondary syphilis onset is usually **6 weeks to 6 months** after primary infection. *1 week* - **One week** after initial infection is too early for the development of secondary syphilis; this period is usually when the primary chancre might just be appearing or in its early stages of development [1]. - Secondary syphilis is a systemic stage, requiring more time for bacterial multiplication and dissemination.

Q: Pseudo bubo is caused by:

Donovanosis. ***Donovanosis*** - **Donovanosis**, caused by *Klebsiella granulomatis*, leads to **subcutaneous granulation tissue** that mimics a true bubo but is not an inflamed lymph node, hence the term **pseudo bubo** [1]. - This condition is characterized by **chronic, progressive ulcerative lesions** primarily affecting the genital and perianal areas [1]. *Syphilis* - **Syphilis**, caused by *Treponema pallidum*, typically presents with a **painless chancre** in its primary stage and can lead to systemic symptoms. - It does not cause pseudo buboes; lymphadenopathy, if present, is usually **generalized and non-suppurative**. *Chancroid* - **Chancroid**, caused by *Haemophilus ducreyi*, results in **painful genital ulcers** and often leads to **true, painful, suppurative inguinal lymphadenopathy** (buboes) [1]. - These buboes can rupture and drain pus, which is distinct from the granulomatous lesions of pseudo buboes. *LGV* - **Lymphogranuloma venereum (LGV)**, caused by specific serotypes of *Chlamydia trachomatis*, is characterized by painful and often **suppurative inguinal lymphadenopathy** (buboes) [1]. - These are true buboes that can become fluctuant and drain, unlike the pseudo bubo of donovanosis.

Q: True about LGV ?

Proctocolitis in 2nd stage. ***Proctocolitis in 2nd stage*** - **Proctocolitis** can occur during the **secondary stage** of LGV, particularly in cases involving receptive anal intercourse where the primary inoculation occurs in the rectal mucosa. - Patients present with **bloody rectal discharge, pain, tenesmus, and diarrhea** due to lymphatic spread. - While chronic proctocolitis with strictures occurs in late-stage disease, acute proctocolitis is a manifestation of the secondary stage. *Groove's sign in 3rd stage* - **Groove sign** is actually characteristic of the **second stage**, not the third stage of LGV. - It represents the depression created when enlarged inguinal lymph nodes are separated by the inguinal ligament during the acute lymphadenopathy phase. - The third stage involves chronic complications like strictures and elephantiasis, not acute groove sign. *Bubos in 1st stage* - **Bubos** (painful, swollen regional lymph nodes) are characteristic of the **second stage** of LGV, not the first. - The first stage typically features a transient, small, painless papule or ulcer that often goes unnoticed. *Bleeding ulcer in 1st stage* - The primary lesion of LGV (first stage) is usually a **small, painless papule, vesicle, or ulceration** that is typically non-bleeding. - The primary lesion is often transient and may go unnoticed before lymphadenopathy develops.

Question 1

Incubation period of LGV:

Accepted Answer

1 month

Answer

15-45 days

Answer

6 months

Answer

3-12 days

Question 2

Secondary syphilis is characterised by all except (choose the MOST appropriate answer)

Accepted Answer

Gummatous ulcers

Answer

Cutaneous coppery rashes

Answer

Moth - eaten alopecia

Answer

Ivory sequestrum

Question 3

Not a cutaneous manifestation of TB:

Accepted Answer

Lupus pernio

Answer

Erythema nodosum

Answer

Scrofuloderma

Answer

Lupus vulgaris

Question 4

Moth-eaten alopecia is seen with:

Accepted Answer

Syphilis

Answer

Cylindroma

Answer

Fungal infection

Answer

Leprosy

Question 5

False about syphilis is :

Accepted Answer

Syphilitic ulcers(Chancre) are extremely painful

Answer

Secondary syphilis is due to hematological dissemination

Answer

"General paresis of Insane" is due to CNS involvement in tertiary syphilis.

Answer

Incubation period is 9-90 days

Question 6

All of the following organs may be involved in Leprosy except -

Accepted Answer

Uterus

Answer

Eye

Answer

Nasal mucosa

Answer

Testes

Question 7

Which of the following drugs can produce dramatic improvement in patients with type 2 lepra reaction?

Accepted Answer

Thalidomide

Answer

Steroids

Answer

Dapsone

Answer

Clofazimine

Question 8

Secondary syphilis occurs after:

Accepted Answer

6 weeks

Answer

9 weeks

Answer

13 weeks

Answer

1 week

Question 9

Pseudo bubo is caused by:

Accepted Answer

Donovanosis

Answer

Syphilis

Answer

Chancroid

Answer

LGV

Question 10

True about LGV ?

Accepted Answer

Proctocolitis in 2nd stage

Answer

Bubos in 1st stage

Answer

Groove's sign in 3rd stage

Answer

Bleeding ulcer in 1st stage

Bacterial Skin Infections — MCQs

Bacterial Skin Infections — MCQs

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