||Comparison of 'Giardia microti' and 'Spironucleus muris' Cysts in the Vole: An Immunocytochemical, Light, and Electron Microscopic Study (Journal Version).
Januschka, M. M. ;
Erlandsen, S. L. ;
Bemrick, W. J. ;
Schupp, D. G. ;
Feely, D. E. ;
||Minnesota Univ., Minneapolis. ;Nebraska Univ. Medical Center, Lincoln. Dept. of Oral Biology and Basic Science.;Health Effects Research Lab., Research Triangle Park, NC.
Water analysis ;
Parasitic intestinal diseases ;
Electron microscopy ;
Giardia microti ;
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Cysts of the genus Spironucleus share many common morphological features with Giardia cysts including: 2-4 nuclei, flagellar axonemes, a distinct cyst wall, and they even display the same immunostaining as Giardia cysts when labeled with antibodies specific for Giardia cyst wall. A direct comparison of Spironucleus muris and Giardia microti cysts has revealed that cysts of S. muris are significantly smaller than cysts of G. microti. At the ultrastructural level, the cyst walls are similar in fibrillar appearance, but the width of the S. muris cyst wall is significantly less than that of G. microti. The cysts of S. muris also differ from G. microti in that they contain a striated rootlet fiber, flagellar sheath, and numerous glycogen rosettes. Characteristic features of Giardia include the adhesive disc and median body. Although the cysts of Spironucleus and Giardia are similar in appearance, these unique morphological features can be used to distinguish between the 2 protozoa and should be employed in the detection of Giardia cysts in water samples. (Copyright (c) American Society of Parasitologys 1988.)