*Genus: Thelazia (Eye worm )
Sp: T. rhodeshi—Cattle, sheep, goat, buffalo.
T . lacrymalis---Horse
T.
californiensis---Sheep, goat, cat, man
I/H: Musca
sp.
Fannia
sp.
Morellia
sp.
Morphology: Small, thin, white worm, 1-2 c.m. long. Cuticle has prominent
transverse striation at the anterior end. Females are viviparous. (Not
ova-viviparous)
Location: Congunctival sac & lacrimal duct & under nictitating
membrane.
Life cycle:
Adult female in eye. --- lay L-1 in lacrimal secretion----Ingested by I/H
( files) feeding
on secretion ----L3 develop in the ovarian follicle of fly.----L-3 migrate to
proboscis--- deposited in the eye of new host.---L-4
----Adult.
P.P.P.= 3-11
weeks.
Pathogenesis:
Due to secreted cuticle of the worm
& for the movement by active young adult.
Lacrimation followed by conjunctivitis
Keratitis, cloudiness & ulceration of cornea.
Swollen eye covered with exudates & pus .* Cranial opacity.
Congestion of conjunctiva &
cornea. * Photophobia.
Files are usually clustered around the eye because of excessive
secretion.
Diagnosis:
Observation of
parasite in conjunctival sac
Presence of L-1
in lacrimal secretion.
Adult parasite
in the eye can be found it manipulated by using local anaesthetic.
Treatment:
Manual
removal of parasite with a fine forceps using local anaesthetic.
Anthelmintic
drugs :
1.
Methyridine –20 ml
s/c inj.
Methyridine –20 ml
s/c inj.
2.
Tetramisole—15 mg /kg body
weight orally or parent rally
3.
,evamisole--% mg/ kg body
weight
or, 1% aqueous
solution –topical preparation.
Prevention: Difficult as fly vectors are ubiquitous.
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