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1 April 2000 Ultrastructure of Frenkelia sp. from a Norwegian Lemming in Finland
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Abstract

An apparently healthy Norwegian lemming (Lemmus lemmus) caught in northern Finland was observed to have a whitish body 0.5 to 1.0 mm in diameter in the external layer of the cerebral cortex. By light microscopy a highly lobulated cyst of Frenkelia sp. was observed. By transmission electron microscopy the cyst wall was seen consisting of a parasitophorous vacuolar membrane, an underlying electron-dense layer and a granular layer. The membrane was only slightly convoluted. The protrusions of the cyst wall appeared round but were often not distinctive. A very thin septum divided the interior of the cyst into compartments packed with bradyzoites and maturing zoites. The bradyzoites were elongate measuring 5–8 × 1.5–2 μm. This is the first electron microscopical study of Frenkelia sp. from L. lemmus.

Laakkonen and Henttonen: Ultrastructure of Frenkelia sp. from a Norwegian Lemming in Finland
Juha Laakkonen and Heikki Henttonen "Ultrastructure of Frenkelia sp. from a Norwegian Lemming in Finland," Journal of Wildlife Diseases 36(2), 362-366, (1 April 2000). https://doi.org/10.7589/0090-3558-36.2.362
Received: 7 July 1999; Published: 1 April 2000
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