NDLI: Light and transmission electron microscopic studies on trophozoites and cyst-like stages of Histomonas meleagridis from cultures

Content Provider	Springer Nature Link
Author	Munsch, Mareike Lotfi, Abdulrahman Hafez, Hafez Mohammed Al Quraishy, Saleh Mehlhorn, H.
Copyright Year	2008
Abstract	The present study deals with Berlin strains of Histomonas meleagridis, the specimens of which were cultivated in Dwyer’s medium. The light and electron microscopic examination revealed that the cultivated trophozoite stages (reaching about 10 μm in size) appeared more or less spherical, although their surface (covered by a single membrane) showed amoeba-like waves. All stages were uni-nucleated and reproduced by binary fission with an extranuclear spindle apparatus. Some trophozoites appeared ovoid and possessed a single flagellum with a typical microtubular 9 × 2 + 2 arrangement. Furthermore, the latter were characterized by an inner row of typical microtubules (remnant of an axostyle) and a Golgi apparatus (both adjacent to the nucleus), multivesicular structures, hydrogenosomes, and many food vacuoles containing either starch grains or bacteria. Their cytoplasm was densely filled with glycogen granules and ribosomes. Similar stages were also documented in the caeca and cloaca of chicken when being inoculated (via cloaca) with such culture stages. In addition to these typical trophozoites, the cultures contained a low number of 10-μm-sized spherical cyst-like stages with a surrounding amorphous layer. The cytoplasm of some of these cyst-like stages—when studied by electron microscopy—appeared with two membranes or had formed an amorphic, cyst-wall-like layer at their surface, apparently corresponding to their light microscopical appearance. Such stages might be involved in transmission from one host to another and probably have been missed before in microscopical examinations of infected poultry.
Starting Page	683
Ending Page	689
Page Count	7
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	104
Issue Number	3
e-ISSN	14321955
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-11-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Immunology Microbiology Medical Microbiology
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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