TOA
PAYOH VETS
1447. Dermatophytosis --- Diagnosis of ringworm using ultraviolet light
Hairs, nails and
superficial skin
surface of the
dog are areas
affected
The cause is
usually
Microsporium
canis, M.
gypseum or
Trichophyton
mentagrophytes,
DIAGNOSIS
1. Fungal
culture with
macroconidia
identification
Microscopic exam
of the
macroconidia is
necessary to
confirm the
genus and
species
2. UV light -
Hairs that show
a positive
apple-green
fluorescence
under
ultra-violet
light (Wood's
lamp)
examination.
M.canis on hair
shaft will show
apple-green
fluorescence.
But keratin with
epidermal scales
and sebum may
also produce a
false-positive
fluorescence.
3. Microscopic
examination of
hair
This often
produce false
negative results
and so the vet
may mis-diagnose
as the absence
of ringworm.
Wood's lamp may
be used on
positive cases
to show
fluorescence on
the fungal
hyphae in the
hair shaft
EDUCATIONAL VIDEO
OF UVL
FLUORESCENCE
In a case of a
white Pomeranian
with itchiness and
hair loss, I
diagnosed ringworm
visually, using
the microscope and
the UV light as
shown in the image
above.
In a case of an
old poodle with
multiple warts,
the owner
complained about
generalised
itchiness and skin
dandruff. The dog
had circular areas
of skin loss and
patches which
fluoresces in
light green.
Anti-fungal cream
and washes and
steroids had been
used earlier. I
switched off the
room light and
asked Ms Toh, my
intern to film the
fluorescence but
the skin
fluorescence
results are not
satisfactory.
Most likely I have
used the incorrect
lens which can't
focus well. The
lens is not able
to focus. However,
I will put up this
video to serve as
a learning
experience.
Yesterday, on
Saturday, Jun 8,
2013, I consulted
the camera
vendors. I was
told that my lens
were not
appropriate for
video. I needed a
lens suitable for
video production
and this lens came
with the Canon
700D model
available just 2
weeks ago. I have
this lens now and
hope that future
videos will be
better quality.
|
Video 1 -
ringworm -
ultraviolet
light is at: (NOT AVAILABLE YET) Video 2 - ringworm - microscopy is at: http://www.youtube.com/watch?v=SqclWgPXw10 |
Update
will be on this
webpage:
http://www.sinpets.com/F5/
20130609ringworm_UV_light_toapayohvets.htm
More info at:
Dogs or
Cats
To make an
appointment:
e-mail
judy@toapayohvets.com
tel: +65 9668-6469,
6254-3326