22 Questions
What is the significant pathogen in the Dermatophilus genus?
Dermatophilus congolensis
How are infections by Dermatophilus spread?
Contact, fomites, biting insects
What characteristic differentiates Dermatophilus from streptomyces and nocardia in stained smears?
Branching hyphal elements
What type of colonies does Dermatophilus form on agar after 24-48 hours?
Small, rough, greyish white colonies
What is the main mode of growth for Dermatophilus on agar?
Colonies with lacelike borders
What is the color change observed in Dermatophilus colonies with further incubation?
Yellowish to yellow-orange
What is the infective form of Dermatophilus causing infection in cattle, sheep, deer, etc?
Motile zoospore
Which animals are most commonly affected by cutaneous streptotrichosis in Africa?
Rabbits and elands
What type of branching is observed in the morphology of Dermatophilus?
Lateral branching at acute angles
Which of the following environmental conditions is favorable for the survival of Dermatophilus?
Dry season
What is the primary mode of spreading infections caused by Dermatophilus?
Direct contact
What type of lesion may be found in advanced cases of Dermatophilus infection?
Crusts or scabs
Which type of cattle breeds are highly susceptible to dermatophilosis according to the text?
White Fulani and European breeds
What part of horses is sporadically affected by dermatophilosis according to the text?
Coronets and pasterns
What animal activity contributes to the spreading of infections caused by Dermatophilus?
Bird pecking
What type of cells form parallel rows producing motile flagellate zoospores in Dermatophilus?
Coccoid cells
Which of the following is NOT a characteristic clinical sign of dermatophilosis in cattle?
Generalized pruritic dermatitis with alopecia
In dermatophilosis, the formation of which type(s) of immunity occurs?
Both humoral and cell-mediated immunity
Which of the following statements about effective vaccines for dermatophilosis is TRUE?
Effective vaccines are live whole organisms with different antigenic specificity in deep layers of the epidermis
Which of the following staining techniques is NOT mentioned for the diagnosis of dermatophilosis?
Giemsa stain of smears from moistened scabs
Which of the following antimicrobial agents is Dermatophilus congolensis RESISTANT to, according to the text?
Kanamycin
Which of the following treatment regimens has been found to be beneficial in cattle with dermatophilosis in Nigeria?
Griseofulvin orally with 1% gentian violet in potassium iodide
Learn about the Dermatophilus genus antigens including Dermatophilus congolensis and Dermatophilus chelonae. Understand their significance as pathogens in animals such as cattle and sheep.
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