The report of cryptosporidiosis (cryptisporidium infection) in commercial chicken farms of Tabriz area

Materials for this study were consisted of 100 carcasses of broiler chickens aged 14 to 60 which had died from respiratory problems and/or Gumboro disease with diarrhea. These carcasses were submitted from local poultry farms to the department of poultry diseases of the veterinary college of Islamic Azad University، Tabriz Branch for post mortem examination. Intestinal faecal from colac and cecum، trachea and lung samples from the carcasses were examined for the presence of cryptosporidium oocysts after staining using by modified Ziehl – Neelson technique. In this study Cryptosporidium oocysts were found in 5 percent of intestinal samples and in none of the respiratory samples.