trichostrongylus colubriformis: possible most common cause of human infection in mazandaran province, north of iran.

background: infection with trichostrongylus spp. is common among human and herbivorous in most parts of iran, especially in southern and northern ar-eas. the aim of present study was to identify trichostrongylus spp. among hu-man population using excreted egg specimens, by the molecular method, in mazandaran province, northern iran. methods: overall, 33 positive fecal specimens were randomly sampled and examined. pcr amplification of its2-rdna region was performed on the isolated egg and then a restriction fragment length polymorphism (rflp) profile was considered to discriminate of trichostrongylus spp. results: a total of 33 positive fecal specimens, 29(78.9%), 4(12.1%) were found t. colubriformis and t. axei respectively. our data appear the molecular evidence of both human t. colubriformis and t. axei infections in north of iran. conclusion: t. colubriformis was the probable most common zoonotic species caus-ing human trichostrongylosis infection in the area