Laakkonen J, Henttonen H
Department of Biology, University of California, San Diego, La Jolla 92093-0116, USA.
J Wildl Dis. 2000 Apr;36(2):362-6. doi: 10.7589/0090-3558-36.2.362.
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 lemmus) collected in 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 x 1.5-2 microm. This is the first electron microscopical study of Frenkelia sp. from L. lemmus.
在芬兰北部捕获的一只看似健康的挪威旅鼠（Lemmus lemmus），在其大脑皮层外层观察到有直径为0.5至1.0毫米的白色物体。通过光学显微镜观察到一个高度分叶的弗氏属（Frenkelia sp.）囊肿。通过透射电子显微镜观察，囊肿壁由一个寄生泡膜、一个下层电子致密层和一个颗粒层组成。该膜仅略有卷曲。囊肿壁的突起呈圆形，但通常不明显。一个非常薄的隔膜将囊肿内部隔成充满缓殖子和正在成熟的子孢子的隔室。缓殖子呈细长形，大小为5 - 8×1.5 - 2微米。这是对来自挪威旅鼠的弗氏属的首次电子显微镜研究。
