Ação de diferentes desinfetantes na viabilidade e desenvolvimento de ovos e na migração larvar de Toxocara cati (Schrank,1788) em camundongos

Abstract

The Toxocara cati is one of the major intestinal parasites of cats and has great importance in public health as zoonotic agent of Visceral and Ocular Larva Migrans in humans. Studies to eliminate the infectious forms of this helminths are scarce. The aim of this study was to evaluate the action of various disinfectant solutions on the development of eggs of T. cati viability and infectivity of larvae present in the eggs of this parasite. Eggs were obtained from the dissection of female T. cati, recovered from infected cats. These were suspended in distilled water and divided into five groups with six replicates, each with about 3300 eggs. Each group was exposed for one hour at one of four selected commercial disinfectants and a control, and then washed with distilled water for removal of disinfectant solutions. All samples were assessed for development of eggs on days 0, +3, +6, +9, +12, +15, +18, +21 and +24. At the end of the observation period, 30 mice were infected with the samples. After 15 days the mice were euthanized and the brain, liver, lungs and kidneys, and carcass, macro-and microscopically observed. From day +6 eggs exposed to different treatments showed larva inside. And even after 24 days of exposure, the disinfectants were not able to inhibit the development or eliminate the larvae. The number of larvae recovered from infected mice showed that migration was observed in all animals. The carcass showed better recovery between the tissues analyzed. In no animal treated larvae were seen in the brain. No disinfectant used was able to inhibit embryogenesis of eggs of T. cati after one hour of exposure. The degree of infectivity and the migration pattern of the larvae was maintained even after treatment with disinfectants