... in the gut of the sandfly,but the organism completes its life cycle in the host following the fly bite. The sandfly inoculates the host with the organismsin the promastigote stage. Once the ... bacteria. The mucosal lesions can involve the oral mucosa, pharynx, lacrimal glands, nasal mucosa, larynx, and other sites.251-255If untreated, there may be erosion of the nasal septum and the palate, ... proliferating), and tissue cysts. The noninfectious oocysts are excreted by the cat, and, in the soil, if they are exposed to the right conditions, will grow intoinfectious oocysts. The tachyzoites are the...