The major cause of us is: (A) M. canis, (B) E. floccosum, (C) T. rubrum, (D) T. schoenlenii
Answer is D. Favus is a chronic infection caused most commonly by T schoenleinii and usually affecting the scalp. Most common organism associated with us is Trichophyton schoenlenii. E. floccosum- cause Tinea unguium (nail beds) M. canis- cause ECTOTHRIX(infection of hair) T. rubrum- cause Tinea cruris (groin area)