Identification and Clinical Importance of Fungal Pathogens
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Questions and Answers

Which yeast is the causative agent of candidiasis?

  • Histoplasma spp
  • Mycetoma
  • Candida albicans (correct)
  • Cryptococcus neoformans
  • In which sites are pathogenic Candida usually found in humans?

  • Mouth and vagina (correct)
  • Intestines and digestive system
  • Lungs and respiratory system
  • Skin and external surfaces
  • What is the distinctive feature of Candida albicans' morphology?

  • Formation of true hyphae (correct)
  • Presence of pseudohyphae in cultures
  • Growth as budding yeast cells
  • Formation of chlamydosphores on nutritionally deficient media
  • How is Candida albicans identified in the laboratory?

    <p>Formation of germ tubes</p> Signup and view all the answers

    What usually precedes invasive candidiasis?

    <p>Increased colonization of the mouth and vagina</p> Signup and view all the answers

    How do non-albican Candida species enter the blood in majority of cases?

    <p>Through intravascular catheterization</p> Signup and view all the answers

    What is the diagnostic feature used to identify Candida albicans?

    <p>Formation of large thick walled spores on nutritionally deficient media</p> Signup and view all the answers

    Which of the following is a distinctive feature of Candida albicans' morphology?

    <p>Formation of true hyphae</p> Signup and view all the answers

    What is the distinctive feature used to identify Candida albicans?

    <p>Ability to form large thick walled spores called chlamydospores</p> Signup and view all the answers

    What usually precedes invasive candidiasis?

    <p>Increased colonization of the mouth and vagina due to broad spectrum antibiotics</p> Signup and view all the answers

    How is Candida albicans identified in the laboratory?

    <p>Ability to form large thick walled spores called chlamydospores</p> Signup and view all the answers

    What is the causative agent of candidiasis?

    <p>Candida albicans</p> Signup and view all the answers

    Where are pathogenic Candida usually found in humans?

    <p>Mouth and vagina</p> Signup and view all the answers

    What is the primary characteristic that distinguishes Candida albicans from other species?

    <p>Formation of germ tubes</p> Signup and view all the answers

    What is the distinguishing feature of Candida albicans' morphology?

    <p>Ability to form large thick-walled spores called chlamydospores</p> Signup and view all the answers

    How is Candida albicans identified in the laboratory?

    <p>By forming germ tubes (Reynolds Braude phenomenon)</p> Signup and view all the answers

    What usually precedes invasive candidiasis?

    <p>Increased colonization of the mouth and vagina due to broad-spectrum antibiotics</p> Signup and view all the answers

    Which yeast is the causative agent of candidiasis?

    <p>Candida albicans</p> Signup and view all the answers

    Where are pathogenic Candida usually found in humans?

    <p>Mouth and vagina</p> Signup and view all the answers

    What is the distinctive characteristic that distinguishes Candida albicans from other species?

    <p>Dimorphic nature with true hyphae formation</p> Signup and view all the answers

    How do non-albican Candida species enter the blood in the majority of cases?

    <p>Through intravascular catheterization</p> Signup and view all the answers

    (What are the majority of non-albican vagina species likely to enter the blood through?)

    Signup and view all the answers

    What is the distinguishing feature of Candida albicans' morphology?

    <p>Production of chlamydosphores on nutritionally deficient media</p> Signup and view all the answers

    What usually precedes invasive candidiasis?

    <p>Increased colonization of the mouth and vagina due to broad-spectrum antibiotics</p> Signup and view all the answers

    Where are pathogenic Candida usually found in humans?

    <p>In the mouth and vagina</p> Signup and view all the answers

    What is the causative agent of candidiasis?

    <p>Candida albicans</p> Signup and view all the answers

    Which yeast is the causative agent of candidiasis?

    <p>Candida albicans</p> Signup and view all the answers

    How is Candida albicans identified in the laboratory?

    <p>Production of chlamydosphores on nutritionally deficient media</p> Signup and view all the answers

    Which characteristic distinguishes Candida albicans from other species?

    <p>Formation of large, thick-walled spores called chlamydospores</p> Signup and view all the answers

    What distinguishes the majority of non-albican vagina species from Candida albicans?

    <p>Formation of true hyphae</p> Signup and view all the answers

    How is Candida albicans identified in the laboratory?

    <p>Formation of large, thick-walled spores called chlamydospores</p> Signup and view all the answers

    What usually precedes invasive candidiasis?

    <p>Increased colonization of the mouth and vagina due to broad spectrum antibiotics</p> Signup and view all the answers

    What are the majority of non-albican vagina species likely to enter the blood through?

    <p>Intravascular catheterization</p> Signup and view all the answers

    What is a distinguishing feature of Candida albicans' morphology?

    <p>Formation of true hyphae</p> Signup and view all the answers

    What is the primary characteristic used for accurate identification of Candida species other than C. albicans?

    <p>(Reynolds Braude phenomenon) Formation of germ tubes</p> Signup and view all the answers

    Study Notes

    Candidiasis

    • Candida albicans is the causative agent of candidiasis.
    • Pathogenic Candida is usually found in humans in the following sites: skin, mucous membranes, and gastrointestinal tract.

    Morphology of Candida albicans

    • The distinctive feature of Candida albicans' morphology is the formation of germ tubes and chlamydospores.
    • Germ tubes are long, branching tubes that form when Candida albicans is incubated in serum.
    • Chlamydospores are large, thick-walled spores that are formed at the end of the germ tubes.

    Laboratory Identification

    • Candida albicans is identified in the laboratory by its ability to form germ tubes and chlamydospores.
    • The germ tube test is a rapid and accurate method for identifying Candida albicans.

    Pathogenesis

    • Invasive candidiasis is usually preceded by colonization of the skin or mucous membranes.
    • Non-albican Candida species enter the blood in the majority of cases through central venous catheters or other medical devices.
    • Candida albicans can also enter the blood through the gastrointestinal tract.

    Characteristics of Candida albicans

    • The primary characteristic that distinguishes Candida albicans from other species is its ability to form germ tubes and chlamydospores.
    • This characteristic is used for accurate identification of Candida albicans in the laboratory.

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    Description

    Learn about the clinical importance, morphology, and identification of fungal pathogens such as Candida albicans, Cryptococcus neoformans, Histoplasma spp, and Mycetoma. Understand their role as causative agents and their growth characteristics in cultures and tissues.

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