Mycoplasma hyopneumoniae and M. hyorhinis

Mycoplasma hyorhinis.

Colonies of Mycoplasma hyorhinis cultivated on commersially Mycoplasma-Experience medium  for 7 days. The length of the scale bars is equivalent to 1 mm. Credit: Joachim Frey and Bettina Trueb.

Thanks to Professor Joachim Frey (Institute of Veterinary Bacteriology, University of Bern, Swit- zerland), we have got images of colonies of Mycoplasma hyopneumo- niae and M. hyorhinis to by used on the corresponding bacterial pages of VetBact. Mycoplasmas form very small colonies (0.1-1 mm in diameter) and to see details of the colonies, a microscope has to be used. The colonies are in general umbonated and are said to look like fried eggs. However, these two mycoplasmas form atypical colonies with very poorly defined “egg yolk”.

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