Monday, December 17, 2012

Mucor spp.

Another zygomycete organism similar to Rhizopus spp. is Mucor spp.  This rapidly growing organism is also an opportunistic pathogen for immune compromised individuals.  It can cause mucormycosis.  It is in the news recently (September, 2015) as a possible source for transplant patient deaths at Pittsburgh's UMPC Presbyterian - WESA FM.

The spores are round and there is no root like structure as there is for Rhizopus spp.  The spores do not have distinguishing characteristics and are not identifiable on an Air-O-Cell cassette sample.

In culture the colony grows rapidly at 25 and  for some pathogenic species at  37 degrees C.  Growth is rapid on MEA and PDA and much slower on DG-18 due to the inhibition by dichloran.  The colony growth on agar is a light brown in contrast to the white mycelium with dark pepper like spots of Rhizopus spp.

Mucor spp. line drawings showing various stages of the sporangium - N. Carlson


Mucor plumbeus 400x growth in culture -lactophenol cotton blue stain - N Carlson

Mucor racemosus growth in culture 400x lactophenol cotton blue stain - N. Carlson

Mucor spp. lactic acid stain - N. Carlson

Mucor spp. colony growth on a culture plate - N. Carlson
Mucor spp.  by the IAQ video network.

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