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Protozoa is motile<br>unicellular and eukaryote.
{|class="wikitable"
|-
!
!feature
!intestine<br> (cyst or oocyst)
!blood, RBC
!tissue
|-
!Amoeba<br>アメーバ
|amoeboid motility<br>asexual reproduction<br>(binary fission)<br>infected by cyst
|''Entamoeba histolytica''
|
|free living amoeba
:''Naegleria fowleri''
|-
!Flagellata<br>鞭毛虫
|flagellar motility<br>asexual reproduction<br>(binary fission)<br>infected by cyst
|''Giardia intestinalis''
|''Trypanosoma brucei gambiense/rhodesiense''
|''Trypanosoma cruzi''<br>''Leishmania'' spp.<br>''Trichomonas vaginalis''
|-
!Apicomplexa<br>アピコンプレクサ門
|gliding motility<br>asexual and sexual reproduction<br>infected by oocyst
|''Cryptosporidium'' spp.<br>''Isospora belli''<br>''Cyclospora cayetanensis''
|''Plasmodium'' spp.
|''Toxoplasma gondii''
|}
*''Plasmodium'' spp. と''Cryptosporidium'' spp.の生活環は似ている
**oocystの中にsporozoiteが含まれている
***"oo" means egg
**ただしCはoocystで伝播するがPはoocystによる伝播ではない
*Transmission form
**cyst: ''Entamoeba hystolytica''
**oocyst: ''Cryptosporidium'' spp.
*Transmission route
**fecal-oral: ''Giarida intestinalis''
**vector-borne: ''Trypanosoma'' spp., ''Plasmodium'' spp., ''Leishmania'' spp.
**air-borne: nothing
**vertical: ''Toxoplasma gondii''
*Reproduction
**binary fission: ''Giardia intestinalis''
**asexual reproduction by schizogony and sexual reproduction: ''Plasmodium'' spp.
===nitazoxanide===
*broad spectrum against protozoas and helminths
