New animal model for human ocular toxocariasis: ophthalmoscopic observation.
OBJECTIVE
Although human ocular toxocariasis causes severe vision defect, little is known about its aetiology, diagnosis, and treatment. To develop a new animal model for human ocular toxocariasis, ophthalmological findings of fundi in Mongolian gerbils, Meriones unguiculatus, and BALB/c mice were investigated following infection with Toxocara canis.


METHODS
Using an ophthalmoscope, which was specifically developed to observe the fundi of small animals, ocular changes of fundi of 20 gerbils and 11 mice were monitored after oral infection with embryonated eggs of T canis.


RESULTS
Vitreous, choroidal, and retinal haemorrhages were consistently observed in Mongolian gerbils, but rarely in mice. Severe exudative lesions and vasculitis were often present in gerbils but not in mice. Migrating larvae were also frequently observed in gerbils.


CONCLUSIONS
Mongolian gerbils are more appropriate animal model for human ocular toxocariasis than previously used experimental animal such as mice, guinea pigs, rabbits, and monkeys because of its high susceptibility of ocular infection.
Department of Medical Zoology, Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan.
T H
TH
Takayanagi
N
N
Akao
R
R
Suzuki
M
M
Tomoda
S
S
Tsukidate
K
K
Fujita
D000818:Animals; D002825:Chorioretinitis / Q000469:parasitology; D002832:Choroid Hemorrhage / Q000469:parasitology; D004195:Disease Models, Animal; D015822:Eye Infections, Parasitic / Q000469:parasitology*; D005260:Female; D005654:Fundus Oculi; D005849:Gerbillinae; D007815:Larva Migrans / Q000469:parasitology; D051379:Mice; D008807:Mice, Inbred BALB C; D012166:Retinal Hemorrhage / Q000469:parasitology; D014120:Toxocariasis / Q000469:parasitology*; D014823:Vitreous Hemorrhage / Q000469:parasitology