CLOSTRIDIUM -Colony Morphology

Created by vivax74 

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8 terms

C.botulinum /sporogenes

Large (3 mm)
irregularly circular
smooth
greyish
translucent with a fibrillar edge
β-haemolytic
produces lipase

C.difficile

Glossy
grey
circular colonies with a rough edge
fluoresce green-yellow under UV light
non-haemolytic
characteristic farmyard smell.

Cl.novyi

Raised
circular colonies
become flattened and irregular in old cultures.
Colonies tend to fuse
form spreading growth with a double zone of β- haemolysis.
produces lecithinase and lipase

Cl.perrfringens

Large
smooth
regular convex colonies
may be rough and flat with an irregular edge
has a double zone of β-haemolysis
produces lecithinase

Cl.septicum

thick swarming growth
narrow zone of β-haemolysis

Cl. Sorderans/bifermentelli

Grey-white
convex
circular colonies with crenated edges
which may spread
may be β-haemolytic
produce lecithinase
indole positive

Cl. tetani

Fine swarming growth (difficult to see)
may appear β-haemolytic

Other clostridium species

Colonial appearances vary
produce a spreading growth
may or may not be β-haemolytic

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