Iraqi Journal of Veterinary Sciences

Abstract

This study included the isolation and diagnosis of Prototheca microorganism from milk samples of 80 Cows with clinical and subclinical mastitis from different areas in Mosul city , from October 2006 to May 2007 . Prototheca were identified using morphological, cultural and biochemical characteristics . The study showed that 16 samples ( 20%) were positive to Prototheca from total count included 14 (17.5%) P. zopfii and two isolates (2.5%) P. stagnora . The study show the ability of this microorganism to produce some virulance factors such as : Urease , Esterase , Lecithinase and Lipase . Results of antibiotic sensitivity test indicated that all isolates were resistant to Ampicillin , Amoxycillin , Cephalexin , Neomycin , Streptomycin and Tetracycline , while they showed different percentages of sensitivity to Gentamycin , Polymyxin B and Nystatin.