The causative agent for virulent external ear infection in a diabetic elderly is mostly by
Pseudomonas aeruginosa is the agent which is responsible for virulent external ear infection in diabetics, mainly Necrotizing otitis externa. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 55)
Staphylococcus
Streptococcus
Pseudomonas
Hemophilus influenzae
Ear