Most common form of actinomycosis: (A) Facio cervical, (B) Thorasic, (C) Right illiac fossa, (D) Liver
Answer is A. Actinomycosis is caused by Actinomyces israelii. Facio-cervical is the most common type. Infection spreads either from tonsil or from adjacent tooth. Actinomyces israelii is an anaerobic gram - positive fungal like bacterium. It is called as Ray fungus. Reference : SRB's Manual of Surgery, 6th Edition, page no = 54.