The first record on Giardia muris from mice in Turkey.

Giardia muris has been reported from both laboratory and wild rodents in worldwide. During routine care, soft consistency was observed in feces of Swiss albino mice. Motile Giardia spp. trophozoites were observed microscopically on all fecal preparations after stained with Lugol's iodine solution. The trophozoites were broadly ovoid in a form with a pointed end. They possess two large nuclei and an adhesive disk whose length overlapped one-half of the trophozoite body length. The caudal flagella are unequal. β giardin (bg) gene region of isolates was successfully amplified and sequenced. According to sequence analyses of the bg gene region, the mice isolate was identified as G. muris and deposited in GenBank (Accession Number: MK675656). The bg sequence of G. muris was shown 99.3-99.7% identity with the isolates of G. muris reported from different countries in GenBank. We have firstly demonstrated G. muris trophozoites in the fecal samples of naturally infected Swiss albino mice in Turkey. © Indian Society for Parasitology 2020.