Laboratory Techniques Flashcards
detects fungal elements from skin, hair and nails
10-20% KOH
serve as preservative and stain
Lactophenol Cotton Blue
to demonstrate C. neoformans capsule in temporary mount
India ink / Nigrosin
to demonstrate chitin in cell wall
Calcofluor white stain
consider as the best stain in direct microscopy
Calcofluor white stain
Example of Temporary Mounts
10-20% KOH
Lactophenol Cotton Blue
India ink / Nigrosin
Calcofluor white stain
Example of Permanent Mounts
Periodic acid Schiff and Gomori’s Methanamine Silver
Mayer’s Mucicarmine
Fontana Masson and H&E Giemsa or Wright’s
Gram stain and
Acid fast/Kinyoun stain
Demonstrate fluorescens of fungal elements usually hair
Wood Lamp
detect fungi in histologic sections
Periodic acid Schiff and Gomori’s Methanamine
Silver
demonstrate C. neoformans in permanent mount
Mayer’s Mucicarmine
detects hyphal pigmentation
Fontana Masson and H&E
detects yeast within
mononuclear cells (ie. Histoplasma capsulatum)
Giemsa or Wright’s
Incubation temperature for fungi
- 25-30degC or RT
- Ambient air (most fungi grow within 2 weeks incubation)
Antimicrobial agents in
Fungal media
- Chloramphenicol
- Cycloheximide
prevent bacterial overgrowth
Chloramphenicol