The invertebrate host? Vector In Brazil the vectors are mosquitos of the Lutozomys sort. It has some popular denominations, in accordance with the region: insect-pallha, birigui, tatuquira, cangalhinha, wing-last, etc. Are very small, measuring between one and three mm of size. But the females are hematfagas and the blood is vital for the reproduction, without which the eggs are not developed. The males feed themselves of seiva of plants. Mosquitos that live in the neighborhoods of the residences have nocturnal habit, initiating the revoada one when entardecer, drawing out for all the night.
The ones that inhabits the bushes also exert the hematofagia during the day. People who circulate in bush areas where exist the mosquito vector (hunting, woodcutters, etc), contract a form popularly branda of the illness, known as ' ' illness of lenhador' '. The vertebrate host wild Mammals in general (erosive, opossum, tamandu, armadillo, candeos, foxes, primate, laziness, etc) are involved in the biological cycle of the leishmania. ' ' The domestic dog and the man are hosts acidentais' '. The contamination When pricking a infectado animal, the mosquito sucks the blood together with the infectante agent (leishmania) that it passes for transformation in its interior, migrando after that for the glands salivares. This transformation in the organism of the vertebrate host is of basic importance for the contamination process.
When the mosquito, now infectado, subsequentemente feeds itself, the parasites is inoculated in the new host, having initiated itself a fight of the organism attacked against the invading agent. The imunolgico system goes to try to isolate and to destroy the microrganismo, exempting the host of the infection and conferring immunity, what it occurs in the majority of the cases. However, it has cases where the organism does not obtain to get rid itself of the parasite, passing then to the condition of ' ' portador' ' until the development of the illness.