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 |