, Volume 142, Issue 2–4, pp 119–125 | Cite as

Dissociation in M. avium

  • S. R. Pattyn
  • M. T. Hermans-Boveroulle


The study of colony morphology ofM. avium revealed 3 types: SmT, Rough R and Smooth D, the latter arising from the SmT type.

The SmT type corresponds to classical freshly isolated strains, developing at 43,5–45°C and being fully virulent for chickens.

The Rough R type is less virulent for chickens and has also much less amidase activity; its maximal temperature for growth is still 44,5 °C.

The Smooth S variety arises as secondary papillae on SmT colonies; it is little or no virulent for chickens, and does not develop at temperature above 41 °C. This type of variation may be responsible for conflicting reports on characters ofM. avium.


Public Health Colony Morphology Amidase Activity Secondary Papilla 
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Copyright information

© Springer-Verlag 1970

Authors and Affiliations

  • S. R. Pattyn
    • 1
  • M. T. Hermans-Boveroulle
    • 1
  1. 1.Prins Leopold Instituut voor Tropische GeneeskundeAntwerpenBelgium

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