The present study was performed to investigate the clinicopathologicalchanges associated with’ greenish diarrhea in chickens. One hundred one day old Hubbard chicks were used for this experiment. They divided into five equal groups.The first gp. kept as normal control, gp. (2) infected orally withSalmonellagallinarum 0.5 mllbird (2.4xI08 viable organism/ml) using stomach tube at 28 days old, gp. (3) infected IIM with VVNDV 0.2 mllbird(106EIDso/ml) at 28 days old, gp. (4) treated orally with lead acetate 40 mg/kg ration from the ih day till the end of the experiment while gp. (5) kept under temporary starvation (by fasting with providing sufficient water and limited amout of food to methe same time (32, 39 and 46 days old) for hematological andThe presence of Arcobacter species in male 20 (66.67%) was higher than female 16 (33.33%).Regarding the examined 24 environmental samples 13 (54.17%) were positive. The incidence of wastewater 14 (76.92%) was higher than feather 10 (23.08%).By identification of the isolated Arcobacter species 28 (48.27%) isolates were A. cryaerophilus, 16 (27.58%) were A. butzleri, 12 (20.69%) were A. skirrowii and 2 (3.44%) were non identifiable.The higher frequency of Arcobacter cryaerophilus in poultry samples than other species.