Lesson 3c: Dermatophilus

Question 1

______ in a smear from scab material. It’s a wide filaments contain “coccal zoospores”

Answer 1

Dermatophilus congolensis

Question 2

____ is associated w/ equine nocardiform , placentitis, leading to loss of the foal in approximately 50% of cases.

Answer 2

Crossiella equi

Question 3

Dermatophilus congolensis zoopores, when activated form this ______ & these develop into filaments which invade the epidermis.

Answer 3

Germ tubules

Question 4

Invasion of epidermis leads to ________ characterized by large number of neutrophils that form “microabscesses” in the epidermis.

Answer 4

Acute inflammatory response

Question 5

Factors that depress specific immune responses including:

Answer 5

1. intercurrent disease
2. pregancy.
3. may increase host suspectibility to dermatophilosis

Question 6

Specimen suitable for laboratory examination in dermatophillus include:

Answer 6

1. Scab material
2. Skin fixed in formalin

Question 7

this staining is used to reveal the characteristics branching filaments containing zoospores:

Answer 7

1. Giemsa staining

Question 8

molecular diagnosis is by?

Answer 8

PCR

Question 9

infections w/ D. congolensis are usually confined to the?

Answer 9

epidermis

Question 10

what are the dx of D. congolensis

Answer 10

1. Clinical signs
2. lesions

Question 11

treatment of D. congolensis

Answer 11

Penicillin-streptomycin

Question 12

dermarophillus growth does not occur in ?

Answer 12

Sabouraud dextrose sugar

Question 13

______ from colonies this reveal solidly staining filaments

Answer 13

Giemsa-stained smears

Question 14

After incubation for 48hours, colonies are up to how many mm in dm? & what characteristics they possess?

Answer 14

1. 1mm dm
2. yellow & haemolytic

Question 15

when incubated for 3-4 days, they become?

Answer 15

1. rough
   2 golden-yellow
2. embedded in the agar

Question 16

older colonies may have ?

Answer 16

mucoid appearance