Taxonomy: Class Blastocystea
Animal: Blastocystis sp 6 11.jpg
Blastocystis sp from culture of chicken faeces. (EM by Deb Stenzel). Blastocystis sp. infections are common in birds - they differ from other Blastocystis spp in that the nucleus does not have a crescentic band of chromatin but has spots/ blocks of condensed chromatin. Blastocystis occurs in many animals including invertebrates, reptiles, birds and mammals including humans. It is not known if it is a zoonosis; Blastocystis may consist of several different species with distinct host ranges. Currently Blastocystis in humans is referred to as Blastocystis hominis and in other hosts as Blastocystis spp.

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