Cysts Toxoplasma

Fig. 2. Postembedding technique. Section through part of a tissue cyst of the protozoan parasite Toxoplasma gondii immunostained with a rat monoclonal antibody (CC2) which recognizes a molecule located in the cyst wall (CW) and in dense granules within the parasite (for details, see ref. 2). N, nucleus PG, polysaccharide granules. Three-step protocol rat monoclonal followed by rabbit antirat Ig and visualized with goat antirabbit Ig conjugated to 10-nm gold. Bar is 0.5 pm.

On the whole, which are the infectious forms of foodbome parasites Main infectious stages (to humans) of coccidian parasites are either highly resistant oocysts (monoxenous species), like Cryptosporidium, or tissue zoites (heteroxenous species), contained in tissue cysts, like those of Toxoplasma. Other parasitic Protozoa develop resistant cystic forms in their life cycle, like Giardia. 

Toxoplasmosis Necrosis containing 3-5 gm tachyzoites (cysts) (inflammation) Toxoplasma CNS frequent multiple lesions... 

Dubey, J. P. and Thayer, D. W. (1994). Killing of different strains of Toxoplasma gondii tissue cysts by irradiation under defined conditions. /. Parasitol. 80, 7(AMJ(r7. 

Dubey, J. P., Lindsay, D. S., and Speer, C. A. (1998a). Structures of Toxoplasma gondii tachyzoites, bradyzoites and sporozoites and biology and development of tissue cysts. Clin. Microbiol. Rev. 11, 267-299. 

Hill, D. E., Sreekumar, C., Gamble, H. R., and Dubey, J. P. (2004). Effect of commonly used enhancement solutions on the viability of Toxoplasma gondii tissue cysts in pork loin. /. Food Prot. 67(10), 2230-2233. 

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