Bacteriology and Mycology: Dermatophilus Genus Antigens
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Questions and Answers

What is the significant pathogen in the Dermatophilus genus?

  • Dermatophilus pedis
  • Dermatophilus dermatonomus
  • Dermatophilus chelonae
  • Dermatophilus congolensis (correct)

    • How are infections by Dermatophilus spread?

  • Contact, fomites, biting insects (correct)
  • Waterborne transmission
  • Foodborne transmission
  • Airborne transmission

    • What characteristic differentiates Dermatophilus from streptomyces and nocardia in stained smears?

  • Lacelike borders
  • Branching hyphal elements (correct)
  • Polar flagella
  • Enlarged colonies

    • What type of colonies does Dermatophilus form on agar after 24-48 hours?

    <p>Small, rough, greyish white colonies</p> Signup and view all the answers

    What is the main mode of growth for Dermatophilus on agar?

    <p>Colonies with lacelike borders</p> Signup and view all the answers

    What is the color change observed in Dermatophilus colonies with further incubation?

    <p>Yellowish to yellow-orange</p> Signup and view all the answers

    What is the infective form of Dermatophilus causing infection in cattle, sheep, deer, etc?

    <p>Motile zoospore</p> Signup and view all the answers

    Which animals are most commonly affected by cutaneous streptotrichosis in Africa?

    <p>Rabbits and elands</p> Signup and view all the answers

    What type of branching is observed in the morphology of Dermatophilus?

    <p>Lateral branching at acute angles</p> Signup and view all the answers

    Which of the following environmental conditions is favorable for the survival of Dermatophilus?

    <p>Dry season</p> Signup and view all the answers

    What is the primary mode of spreading infections caused by Dermatophilus?

    <p>Direct contact</p> Signup and view all the answers

    What type of lesion may be found in advanced cases of Dermatophilus infection?

    <p>Crusts or scabs</p> Signup and view all the answers

    Which type of cattle breeds are highly susceptible to dermatophilosis according to the text?

    <p>White Fulani and European breeds</p> Signup and view all the answers

    What part of horses is sporadically affected by dermatophilosis according to the text?

    <p>Coronets and pasterns</p> Signup and view all the answers

    What animal activity contributes to the spreading of infections caused by Dermatophilus?

    <p>Bird pecking</p> Signup and view all the answers

    What type of cells form parallel rows producing motile flagellate zoospores in Dermatophilus?

    <p>Coccoid cells</p> Signup and view all the answers

    Which of the following is NOT a characteristic clinical sign of dermatophilosis in cattle?

    <p>Generalized pruritic dermatitis with alopecia</p> Signup and view all the answers

    In dermatophilosis, the formation of which type(s) of immunity occurs?

    <p>Both humoral and cell-mediated immunity</p> Signup and view all the answers

    Which of the following statements about effective vaccines for dermatophilosis is TRUE?

    <p>Effective vaccines are live whole organisms with different antigenic specificity in deep layers of the epidermis</p> Signup and view all the answers

    Which of the following staining techniques is NOT mentioned for the diagnosis of dermatophilosis?

    <p>Giemsa stain of smears from moistened scabs</p> Signup and view all the answers

    Which of the following antimicrobial agents is Dermatophilus congolensis RESISTANT to, according to the text?

    <p>Kanamycin</p> Signup and view all the answers

    Which of the following treatment regimens has been found to be beneficial in cattle with dermatophilosis in Nigeria?

    <p>Griseofulvin orally with 1% gentian violet in potassium iodide</p> Signup and view all the answers

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