Microscopy - Toxoplasma gondii

 
Toxoplasma gondii Tachyzoites
Tachyzoites:  Tachyzoites are crescent shaped, about 7 um in length.  They are formed by asexual reproduction in host cells, often macrophages.  Upon rupture of the cells, they invade new cells and continue to reproduce.
Toxoplasma gondii sarcocyst
Sarcocyst:  Sarcocysts (or pseudocysts) are formed of a large number of bradyzoites inside a variety of host cells.  Over time, a wall forms around the cell and the sarcocyst may remain viable for several years.
Oocyst:  The oocyst is form by sexual reproduction of the parasite that only occurs in feline hosts.  They measure approximately 12 um in diameter.

 
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