Infectivity of Giardia duodenalis Cysts from UV Light-Disinfected Wastewater Effluent Using a Nude BALB/c Mouse Model

Table 1

Presence of cysts and trophozoites in faeces, scrapings, and histological preparations from the duodenum and ileum of mice inoculated with cysts of G. duodenalis obtained from treated wastewater disinfected (or not) with UV light.

Groups	Cysts; (faeces)	Cysts; (scrapings)	Trophozoites; (scrapings)	Trophozoites; (histological slides)
Effluent+UV	+(3/3)^a	+(1/3)	+(1/3)	+(3/3)
Effluent	+(3/3)	−(0/3)^b	+(2/3)	+(3/3)
Effluent filtrated	−(0/2)	−(0/2)	−(0/2)	−(0/2)
Sentinel	−(0/1)	−(0/1)	−(0/1)	−(0/1)

aThe presence of cysts in faeces or intestinal trophozoites was found to be infection = positive and,
^bif not detected = negative.