(02-11) Fungal Skin Disease: Dermatophytosis - Dogs and Cats Flashcards
Is Dermatophysis a self limiting condition?
yes - but it may take months to resolve spontaneously
Is it zoonotic?
yep
what organisms account for most cases of dermatophytosis in cats and dogs?
Zoophilic (e.g. Microsporum canis, T. mentagrophytes) and geophylic (e.g. Microsporum
gypseum)
Most cases of dermatophytosis in animals will be associated with what?
an ectothrix parasitism
Dermatophytosis is over diagnosed.
d
What accounts for at least 80% of the isolates in cats and dogs?
Microsporum canis
what animals are predisposed to infection?
Very young and old or immunosuppressed
The main modes of transmission include what?
direct contact with infected host, fomite, or
contaminated environment.
(Remember! Fungal spores can remain viable in the environment for years)
(Remember! Asymptomatic carries (especially cats) can serve as reservoir of infection)
Well-adapted species (e.g. Microsporum canis) will typically induce how much inflammation?
Less well-adapted species (e.g. Microsporum gypseum) will induce how much inflammation?
inflammation helps reduce what?
Incubation periods vary from what to what?
minimal
marked (which will cause more discomfort to the animal but may help reduce the duration of the infection)
Inflammation helps reduce the course of infection.
4 to 40 days
what is most important for the animal’s protection against infection
Cell – mediated immunity
Clinical signs are quite variable
d
Most cases that look like ringworm in dogs will be caused by what?
staphylococcal pyoderma.
(Epidermal
collarette lesions mimic the classic ringworm lesion (patch of alopecia characterized by broken
stubby hair, scaling, and mild erythema).)
what is a nodular lesion resulting from the severe inflammatory reaction induced by rupture of the
hair follicle and the presence of the fungus in the dermis?
It is induced by organisms which are what?
Kerion is a nodular lesion resulting from the severe inflammatory reaction induced by rupture of the
hair follicle and the presence of the fungus in the dermis
not well adapted to the dog and cat skin (e.g. Microsporum gypseum).
what is a rare condition caused by the dermatophyte infection of the keratin at the nail and nail bed?
Onychomycosis (It can be difficult to diagnose and also difficult to manage) (Usually other parts of the body are also involved)
Most cases in cats are associated with what signs?
Pruritus can be present but, it is rare.
What are characterized by subcutaneous nodules with draining tracts with or
without grains due to dermatophyte infection of the dermis and subcutaneous tissue. It is
most commonly seen in Persians
alopecia, crusting and scaling localized to the head and ears.
Pseudomycetomas