Presumed ocular toxocara cati infection in Port Harcourt

Ireju Onyinye Chukwuka, Bassey Fiebai


Toxocariasis is a zoonotic infection transmitted from animals to humans caused by parasitic round worms found in dogs and cats. Ocular toxocariasis is a rare condition caused by toxocara cati that can result in monocular loss of vision. We report an accidental finding of loss of vision in the right eye of a 39-year-old who decided to get an ocular examination following a routine prep talk in an outpatient clinic. Patient was asymptomatic and presenting best corrected visual acuity in the right eye was 6/60. Fundus examination revealed multiple discrete granulomas and a fatty liver revealed on abdominal scan. There is a positive history of living with cats while growing up. We presume this to be a case of toxocara cati. Regular ocular examinations in addition to general medical check-up should be encouraged in pet owners and those handling animals, as well as a high index of suspicion amongst ophthalmologists.


Monocular loss of vision, Ocular toxocariasis, Toxocara cati, Zoonosis

Full Text:



Ahu SJ, Ryoo SK, Woo SJ. Ocular toxocariasis: Clinical features, diagnosis, treatment and prevention. Asia Pac Allergy. 2014;4(3):134-41.

Stewart JM, Cubillan LD, Cunningham ET Jr. Prevalence, clinical features, and causes of vision loss among patients with ocular toxocariasis. Retina. 2005;25:1005-13.

Ahn SJ, Woo SJ, Jin Y, et al. Clinical features and course of ocular toxocariasis in adults. PLoS Negl Trop Dis. 2014;8:e2938.

Moreira GM, Telno PD, Mendoica M, Moreia AN, McBride AJ, Scaini CJ, et al. Human toxocariasis: Current advances in diagnosis, treatment and interventions. Trends Parasitol. 2014;30(9):450-64.

Akeredolu AB, Sowemimo OA. Prevalence, intensity and associated risk factors for Torocara canis infection in Nigerian dogs. J Parasitology Vector Biology. 2014;6(8):111-6.

Ajayi OO, Duhlinska DD, Agwale SM, Njoku M. Frequency of human toxocariasis in Jos, Plateau State, Nigeria. Mem Inst. Oswaldo Cruz, Rio de Janeiro. 2000;95(2):147-9.

Yokoi K, Goto H, Sakai J, Usui M. Clinical features of ocular toxocariasis in Japan. Ocul Immunol Inflamm. 2003;11:269-75.

Woodhall D, Starr MC, Montgomery SP, Jones JL, Lum F, Read RW, et al. Ocular toxocariasis: epidemiologic, anatomic, and therapeutic variations based on a survey of ophthalmic subspecialists. Ophthalmology. 2012;119(6):1211-7.