The Zhgutikovy form mobile, has the 15 — 20 microns long. The shape of a body extended spindle-shaped, up to 10 — 20 microns long. Division longitudinal. Develops in a body of the invertebrate owner — a carrier (a mosquito. In culture on nutrient mediums zhgutikovy forms of leyshmaniye also develop.
Leyshmaniya pass two stages in the development. The Bezzhgutikovy form has an oval body 2 — 6 microns long. The kernel roundish, borrows to 1/3 cages. Near it is, the having appearance of a short stick.
It is necessary to keep test before research at a usual temperature in an exhaust case. It is not necessary to place in the thermostat as at the increased temperature there is a reproduction of bacteria quicker, it is more formed metabolism products that leads to a fast degeneration of protozoa.