Dermatophilus Congolensis

Question 1

common where

Answer 1

tropical and subtropical regions

Question 2

gram

Answer 2

positive

Question 3

filamentous?

Answer 3

yes

Question 4

motility

Answer 4

produces motile coccal zoospores

Question 5

where do organisms persist

Answer 5

skin
dormant zoospores may become activated (moisture, temp)

Question 6

favorable conditions for infection

Answer 6

trauma
wetting conditions
acute inflammatory response
microabscesses in epidermis

Question 7

where do lesions occur

Answer 7

anywhere on body

Question 8

where are adult amblyomma varigatum (tick) found

Answer 8

ventral surfaces

Question 9

how does infection commense

Answer 9

clusters of hairs matted by serous exudate to form “paintbrush” lesions – coalesce to form crusts

Question 10

adult A variegatum feeding sites

Answer 10

scrotum
inguinal regions
udder

Question 11

what age is it more prevalent and severe

Answer 11

young animals

Question 12

how are zoospores transmitted

Answer 12

direct contact with infected animals
blood sucking insects

Question 13

what causes predominant dorsal lesions

Answer 13

heavy prolonged rainfall and warm environmental temperatures

Question 14

diagnosis

Answer 14

-samples – scab, skin
-smears from undersurface of scabs – giemsa stain (reveal branching filaments containing zoospores)
-PCR
-colony characteristics

Question 15

colonies

Answer 15

-up to 1mm diameter, yellow, hemolytic
-when incubated – rough, golden yellow, embedded in agar

Question 16

treatment

Answer 16

oxytetracycline

Question 17

control

Answer 17

depends on geographical location and clinical factors
minimizing effects of predisposing factors
early treatment of clinical cases