Encyclopedia of Parasitology

2016 Edition
| Editors: Heinz Mehlhorn

Sporozoite Formation

  • Heinz MehlhornEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-662-43978-4_4346

The formation of sporozoites of coccidian species occurs differently depending on the species. In species which produce thick-walled oocysts, which are excreted within the feces of their hosts (e.g., Toxoplasma,  Sarcocystis,  Eimeria,  Isospora), the sporozoite production occurs inside another compartment (= sporocyst) from a sporoplasm with 2, 4, 8, etc. nuclei (see  Coccidia). In  Babesia and  Theileria species, which are transmitted within the saliva of ticks and which are previously produced inside salivary gland cells after a zygote ( kinete) had entered, the sporozoites are formed at the periphery of multinucleated sporoplasms. Each sporozoite develops from protruding elevations at the periphery of the sporoplasm. During this process, a peripherally located nucleus is included. In many cases, the last nuclear division gives rise to two sporozoites, where each start formation above one of the two tips of this dividing nucleus.

The sporozoites of  Plasmodiumspecies, which are...

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  1. Schrèvel J et al (2007) Vesicle trafficking during sporozoite development in Plasmodium berghei: ultrastructural evidence for a novel trafficking mechanism. Parasitology 135:1–12PubMedGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Institut für Zoomorphologie, Zellbiologie und ParasitologieHeinrich-Heine-UniversitätDüsseldorfGermany