Hair perforation test is positive in infection with: (A) Trichophyton, (B) Microsporum, (C) Epidermophyton, (D) All of the above
Answer is A. Hair preparation test is done to differentiate Trichophyton rubrum and Trichophyton mentagrophytes. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition