RESUMO
Faecal samples from 3470 cattle, buffalos, camels and common mouse were collected from various farms located in and around Tehran, Isfahan, Shiraz, Tabriz, Mashad, Zahedan and Ahwaz. They were examined for the presence of C. muris - like oocysts using modified Ziehl -Neelsen technique staining. Within this study, it was observed that whereas some farms were completely negative others showed a varying degree of positive cases. For instance, in one of the farm tested at Isfahan 12% of cows were positive for C. muris - like. The presence of C. muris - like in mice circumstantially suggests the possibility of mice transmitting the infection to cattle but it is not known whether cattle can actually become infected with C. muris - like oocysts from mice. The present article might be the first report en the presence. muris - like organism in large ruminants and brown mice in various parts of Iran