02.17.10 - Feb17th ,prevalentparasite(1/...

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Feb 17 th Toxoplasma dondii – waterborne pathogen, prevalent parasite (1/3 of population has been  infected), protozoan (single-celled). Lag time of about 20 years from when it was first discovered  in animals to when it was recorded in humans. A part of the coccidian parasites, which can  make spores (called oocysts – facilitate spread, especially in water). Why are coccidian oocysts a problem? The oocyst spore stage is extremely resistant to desiccation and chemical disinfection, enables  the parasite to survive a great length of time in the environment. Resistant to: physical agents:  UV, dessication, freezing, chemical agents: ozone, bleach, iodine, ethanol, formalin, salts. It can  persist in soil for 18 months and 54 months in water. The oocyst is a non-infectious stage and is essentially the zygote stage of the parasite  surrounded by a protective wall. Only under appropriate temperatures and humidity, rporulation  occurs by meiotic division. Within the sporocysts, the infectious stages (sporozoites) are formed. 
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  • Winter '10
  • TimothyGeary
  • Chronic infection, Manipulates host cell, host brain/eyes. Parasite, coccidian oocysts, Feb 17th Toxoplasma, prevalent parasite

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