Hair perforation test is positive in
infection with ?
a) Trichophyton
b) Microsporum
c) Epidermophyton
d) All of the above
Correct Answer - A
Ans. is ‘a’ i.e., Trichophyton
Hair perforation test
. The hair perforation test consists of inoculating colonies of an
organism into a dish containing a small amount of water, a few drops
of yeast extract solution and some human hair. The dish is
incubated at 300C and after 7 days, some of the hair are taken and
are kept on a slide with a coverslip and are observed under a
microscope. The test is considered positive if the hair has deep,
narrow wedge shaped perforation in it.
. Hair perforation test is done to distinguish between isolates of
dermatophytes, particularly trichophyton mentagrophytes and its
variants.