the house mouse, mus musculus, has been present in chile since approximately 1600 ad and it is the most tipically synanthropic rodent in chile. in order to know its parasites a survey was conducted in three different localities in santiago. the helminthes community was poor in species and only three nematodes species were found: syphacia obvelata,aspiculuris tetraptera and physaloptera calnuensl all these species constitutes the first record in chile. this is also the first record of p. calnuensis in this host. syphacia obvelata was the most abundant and the most prevalent.