Indian Vet. J., May 2018, 95 (05) : 88 - 89
Ocular Setariasis and its Surgical Retrieval in a Horse - A Case Report Department of Veterinary Surgery and Radiology, College of Veterinary and Animal Sciences, Mannuthy, KVASU, Thrissur – 680651, Kerala. (Received : 16-12-2017 406/17
Abstract
A 6 year old stallion was presented to Teaching Veterinary Clinical Complex, Mannuthy with a history of lacrimation and corneal opacity. The worm present in the eye was retrieved surgically and was diagnosed as Setaria digitata. Key words: Stallion, Ocular setariasis Equine ocular setariasis was a vision threatening disease of horses resulting from ectopic parasitism caused by Setaria spp, a genus of laroid worm (Gangwar et al., 2008). In India setariosis is an important cause of corneal opacity in horses and is commonly caused by Setaria digitata, Setaria equina and Thelazia lacrymalis (Sathu, 1974, Ladoucer and Kazacos, 1981; Parrah et al., 2004). A case of equine ocular setariasis and its successful surgical management is reported. Case History and Clinical Observations
A 6 year old stallion was presented to Teaching Veterinary Clinical Complex, Mannuthy with a history of increased lacrimation and bluish discolouration of cornea of right eye for last two weeks. All the physiological parameters were within normal range. On examination of the eye Shirmer Tear Test (STT) value was 25mm and Fluorescent dye test was found to be negative. Detailed ophthalmic examination revealed the presence of a moving worm in the anterior chamber (Fig.1). Corneal oedema and mild corneal opacity was observed in the affected eye. It was decided to remove the eye worm surgically.
Accepted : 01-03-2018)
ketamine hydrochloride @ 2.2 mg/kg body weight intravenously. The animal was restrained in lateral recumbancy and the eye was prepared for an aseptic surgery. The cornea was desensitized with 4 drops of 0.5% proparacaine. Eye was kept open by eyelid retractor. A rm incision of about 2 mm was made at 3 o’clock position at sclero corneal junction. The eye was infused with normal saline and the worm was popped out. Corneal incision was sutured in simple interrupted suture pattern using Vicryl size 6-0. Postoperatively, topical instillation of Flurbiprofen, Hypersol and Moxioxacin eye drops 4 times daily was followed for seven days. The retrieved worm was send for parasitological examination. The affected cornea became completely clear by the end of one week and the animal made an uneventful recovery. On parasitological examination, the larva was identied as genus Setaria by the presence of peribuccal ring and epaulettes of mouth region. Further examination of the larva in Canada balsam revealed it as Setaria digitata due to the presence of unequal spicules.
Treatment and Discussion
General anaesthesia was induced using xylazine hydrochloride @ 1.1 mg/kg body weight and 1
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Fig.1 : Presence of worm in the anterior chamber
The Indian Veterinary Journal (May, 2018)
which eventually resulted in blindness (Jaiswal et al., 2006). References Al-Azawi A. K., Fadhl, A. R., and Fadhl, S. R., (2012) Epidemiological study of Setaria equina infection in donkeys. Iraq Vet. J. 36 : 93-97. Basak, S. K., Hazra T. K., and Bhattacharya, D. (2007) Persistent corneal edema secondary to presumed dead adult larial worm in the anteriorchamber. Ind. J. of Ophthalmology 55: 67-69. Gangwar, A. K., Devi, S., Singh, H. N., and Singh A (2008) Ocular lariasis in equines. Indian Vet. J. 85: 547-548. Jaiswal, S., Singh, S. U., Singh, B. and Singh, H.N. (2006) Ocular setariosis in a horse. Intas Polivet : 67-68 Fig. 2 : Setaria digitata showing unequal sized spicule
Ocular setariasis spreads mostly in summer and autumn when the mosquito vectors were most prevalent (Mritunjay et al., 2011 and Al-Azawi et al., 2012). The infected animals usually displayed signs of photophobia and lacrimation (Basak et al., 2007). The serrated cuticle of the worm and lashing movements within the anterior chamber of the eye caused severe trauma and inammation to the cornea which then progressed into corneal opacity
Ladoucer, C. A and Kazacos, K. R. (1981) Thelazia lacrimalis in horses in India. J. Am. Vet. Med. Assoc. 178: 301-302 Mritunjay, K., Monsang, S. W., Pawde, A. M., Singh, S. K., Madhu, D. N., and Zama, M. M. S. (2011) Post surgical healing effect of placentrex in equine (Equus cabalus) ocular setariasis: A review of 22 cases. The Ind. J. of Field Veterinarians 6: 71-73. Parrah, J. D., Buchoo, B. A., and Moulvi, B. A. (2004) Ocular lariasis in equines. A study of 9 cases. Centaur 4: 70-71. Sathu, S. (1974) Intraocular parasites in horses. A report of ve cases. Ind. Vet. J. 5: 225.
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