QCM : Candida Infections: Forms, Pathogenesis, and Manifestations — 10 questions

Questions et réponses du QCM

1. What is Candida species primarily classified as?

A group of bacteria causing superficial infections
A yeast-like fungus capable of forming pseudohyphae and chlamydospore
A protozoan parasite responsible for oral ulcers
A virus that infects mucosal tissues

A yeast-like fungus capable of forming pseudohyphae and chlamydospore

Explication

Candida species are classified as yeast-like fungi that can exist in different morphological forms, including yeast, pseudohyphae, and chlamydospore. They are not bacteria, protozoa, or viruses, making option 1 correct.

2. What are the morphological forms of Candida that are used for identification and relate to its pathogenicity?

Viruses, capsids, envelopes
Bacteria, hyphae, spores
Yeast, pseudohyphae, chlamydospore
Protozoa, cysts, trophozoites

Yeast, pseudohyphae, chlamydospore

Explication

The forms of Candida include yeast, pseudohyphae, and chlamydospore, which are morphological features used for identification and are important in understanding its pathogenicity. The other options list forms related to bacteria, protozoa, and viruses, which are not relevant to Candida.

3. What is the primary role of pathogenesis factors in Candida infections?

Facilitate tissue penetration and invasion
Enhance host immune response to clear the infection
Reduce fungal growth and limit infection
Prevent tissue invasion and protect the host

Facilitate tissue penetration and invasion

Explication

Pathogenesis factors such as tissue penetration, opportunism, immune suppression, and rapid growth enable Candida to invade tissues and cause infection, which is their main purpose in disease development.

4. When was the association between AIDS and increased susceptibility to candidiasis established or recognized?

Early 1980s
Late 1980s
Late 1970s
Early 2000s

Early 1980s

Explication

The association between AIDS and increased susceptibility to candidiasis was established in the early 1980s, shortly after AIDS was first identified in 1981. This period marked the recognition of AIDS as an immunodeficiency condition that predisposes individuals to opportunistic infections like candidiasis, with over 90% of HIV-infected individuals developing oral candidiasis during their disease course.

5. How does the role of salivary IgA in immunopathogenesis differ from that of T cells in defending against Candida infections?

Salivary IgA enhances neutrophil activity, whereas T cells inhibit Candida growth through cytokine production.
Salivary IgA is involved in systemic immune responses, while T cells only act locally at mucosal surfaces.
Salivary IgA directly kills Candida hyphae, whereas T cells produce antibodies that neutralize Candida toxins.
Salivary IgA prevents Candida adherence to mucosal surfaces, while T cells are primarily involved in cellular immune response and clearing established infections.

Salivary IgA prevents Candida adherence to mucosal surfaces, while T cells are primarily involved in cellular immune response and clearing established infections.

Explication

Salivary IgA mainly prevents the adherence of Candida to mucosal surfaces, acting as a first line of defense, whereas T cells are involved in cellular immunity that helps in clearing established infections. Their roles are complementary but distinct, with IgA preventing colonization and T cells mediating immune responses to eliminate the pathogen.

6. Who is credited with classifying oral candidiasis into acute and chronic forms?

Ellepola ANB
Samaranayake LP
Scully C
Cawson RA

Samaranayake LP

Explication

Samaranayake LP is credited with classifying oral candidiasis into acute and chronic forms, as this categorization is referenced in the context of clinical manifestations and classification of oral candidiasis.

7. Which of the following conditions is most likely to cause pseudomembranous candidiasis in the oral cavity?

Use of broad-spectrum antibiotics
Immunosuppressive therapy or immune suppression
Poor oral hygiene
Nutritional deficiency of vitamin C

Immunosuppressive therapy or immune suppression

Explication

Pseudomembranous candidiasis, or thrush, is most commonly caused by immune suppression or immunosuppressive therapy, which impairs the host's ability to control Candida overgrowth and invasion, leading to characteristic white plaques that can be wiped off.

8. In clinical practice, how can a healthcare provider best apply the recognition of pseudomembranous candidiasis to diagnose the condition?

Identify firm, white, keratotic plaques that do not wipe off with gentle scraping
Identify white plaques in the oral cavity that can be wiped away, revealing erythematous mucosa
Observe red, painful patches with diffuse borders on the palate
Look for persistent, non-removable white patches that cannot be wiped off

Identify white plaques in the oral cavity that can be wiped away, revealing erythematous mucosa

Explication

The hallmark of pseudomembranous candidiasis is the presence of white plaques that can be wiped away, leaving erythematous tissue underneath. Recognizing this feature allows clinicians to differentiate it from other oral lesions and confirm the diagnosis, guiding appropriate antifungal treatment.

9. What is a key clinical feature of erythematous candidiasis?

Red, painful patches with diffuse borders on oral mucosa
Thick, keratinized white plaques resistant to removal
Ulcerative, bleeding lesions with sharp margins
Presence of white, curd-like plaques that can be wiped off

Red, painful patches with diffuse borders on oral mucosa

Explication

Erythematous candidiasis is characterized by red, painful patches with diffuse borders, often following antibiotic or steroid use, and may involve the palate or tongue. Unlike pseudomembranous candidiasis, it does not present with removable white plaques.

10. What is Chronic Hyperplastic Candidiasis?

An acute inflammatory reaction of the oral mucosa with erythematous patches due to Candida.
A persistent, keratinized white plaque on oral mucosa caused by Candida, often resistant to removal and with potential premalignant features.
A superficial fungal infection characterized by soft, white, curd-like plaques that can be wiped off, commonly called thrush.
A rapidly developing superficial yeast infection with white plaques that wipe off easily.

A persistent, keratinized white plaque on oral mucosa caused by Candida, often resistant to removal and with potential premalignant features.

Explication

Chronic Hyperplastic Candidiasis is a persistent, keratinized white plaque on the oral mucosa caused by Candida species. It is also known as candidal leukoplakia and may have premalignant potential. Unlike other forms, it does not wipe off easily and persists over long periods, often requiring antifungal therapy for resolution.

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Candida albicans — forms?

Yeast, pseudohyphae, chlamydospore.

Other Candida species — involved?

C. tropicalis, C. parapsilosis, C. stellatoidea, C. krusei, C. guilliermondii, C. dubliniensis, C. glabrata.

Candida growth temperature?

25–37°C.

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