The causative organism of Avian influenza is a? by Sunday | Dec 20 | Agricultural Science WAEC | 0 comments A. bacterium B. virus C. fungus D. protozoan. Correct Answer: Option B – virus Users Also Read These:The activities of an organism which affect the…The causative organism of maize rust is?The causative agent of Poliomyelitis is?The causative agent of bird flu is a?The causative agent of typhoid fever is?