関: Piroplasmida

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/11/19 15:56:22」(JST)

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Piroplasms (order Piroplasmida) are protozoan parasite of the phylum Apicomplexa.^[1]^[2] They divide by binary fission and as sporozoan parasites they possess sexual and asexual phases (sexual reproduction occurs in the tick gut^[3]). They include the tick parasites Babesia and Theileria.^[4]^[5]

Description

Minute rounded or pyriform parasites found within erythrocytes, or other circulating or endothelial cells of vertebrates, where they reproduce by merogony. The trophozoite stage separated from erythrocyte by single membrane. This distinguishes them from other blood parasites that usually have at least 2 membranes.

There is an apical complex with polar ring and rhopteries but without a conoid and usually without associated pellicular microtubules. They lack flagella and do not form either oocysts or spores.

The known vectors are ticks or leeches in which they undergo sporogony;

Sexual reproduction probably occurs in the vector.

References

^ Definition: piroplasmida from Online Medical Dictionary
^ Flora and Fauna of the British Isles
^ Rudzinska et al. (1983) "Sexuality in Piroplasms as Revealed by Electron Microscopy in Babesia microti" Proceedings of the National Academy of Sciences, U.S.A.
^ Definition: Theileriidae from Online Medical Dictionary
^ Theleriosis: The causal organism and life cycle

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English Journal

Identification of 12 Piroplasms Infecting Ten Tick Species in China Using Reverse Line Blot Hybridization.

Abdallah MO1, Niu Q1, Yang J1, Hassan MA1, Yu P1, Guan G1, Chen Z1, Liu G1, Luo J1, Yin H1.
The Journal of parasitology.J Parasitol.2017 Jun;103(3):221-227. doi: 10.1645/16-161. Epub 2017 Mar 13.
PMID 28355109

Effects of dihydroorotate dehydrogenase (DHODH) inhibitors on the growth of Theileria equi and Babesia caballi in vitro.

Kamyingkird K1, Cao S2, Tuvshintulga B3, Salama A4, Mousa AA5, Efstratiou A3, Nishikawa Y3, Yokoyama N3, Igarashi I3, Xuan X6.
Experimental parasitology.Exp Parasitol.2017 May;176:59-65. doi: 10.1016/j.exppara.2017.03.002. Epub 2017 Mar 9.
PMID 28286324

Development of duplex PCR for simultaneous detection of Theileria spp. and Anaplasma spp. in sheep and goats.

Cui Y1, Zhang Y2, Jian F3, Zhang L4, Wang R5, Cao S6, Wang X7, Yan Y8, Ning C9.
Experimental parasitology.Exp Parasitol.2017 May;176:1-7. doi: 10.1016/j.exppara.2017.01.011. Epub 2017 Jan 31.
PMID 28153803

「ピロプラズマ亜綱」

Piroplasmida
Scientific classification
Domain:	Eukaryota
Kingdom:	Chromalveolata
Superphylum:	Alveolata
Phylum:	Apicomplexa
Class:	Aconoidasida
Order:	Piroplasmida
Families and Genera
	Anthemosomatidae Anthemosoma; ; Babesiidae Babesia; Echinozoon; Entopolypoides; ; Dactylosomatidae Dactylosoma[1]; Haemohormidium; ; Theileriidae Haematoxenus; Sauroplasma; Theileria; ;