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Outbred CD1 mice were administered doses of 1000 and 3000 Toxocara canis eggs and postmortem took place on days 7, 42 and 120 post-infection. Mice were killed by cervical dislocation and brains were sagitally bisected and fixed in 10% neutral buffered formalin prior to histological preparation and examination. The number of T. canis larvae were counted per brain and per section and the number of larvae cited for the first time per section were also recorded. These observations were compared by dose administered and by day of postmortem. The total number of larvae per brain and per section was higher for the 3000 dose compared to the 1000 dose. A different pattern emerged for the number of larvae observed in the brain over the three postmortem days depending upon the dose received. For the 1000 dose larval numbers increase from day 7 to day 120 whereas for the 3000 dose the opposite trend occurs. Larvae were assigned to one of five regions in the brain - the telencephalon, diencephalon, cerebellum, medulla, pons and brain stem and the olfactory bulb. Larvae did not show a random distribution in the brain. The majority of larvae were recorded from the telencephalon and the cerebellum. The percentage of sections with larvae in them is higher for the 3000 dose compared to the 1000 dose for all regions of the brain. For the majority of regions, the percentage of sections with larvae in them increases between day 7 and 42 and then decreases by day 120 and this is most pronounced for the cerebellum. For the telencephalon and diencephalon only, more larvae were detected on the right hand side of the brain compared to the left hand side. Statistical analysis revealed that dose and brain region are significant factors which influence the number of larvae observed in histological sections of the brain but day post-infection is not.

journal of helminthology/journal of helminthology

The influence of inoculum size and time post-infection on the number and position of <i>Toxocara canis</i> larvae recovered from the brains of outbred CD1 mice

The influence of inoculum size and time post-infection on the number and position of Toxocara canis larvae recovered from the brains of outbred CD1 mice