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up and down regulation of parasites

Helmut Gieseke giesekeh at hotmail.com
Thu Apr 13 05:19:03 EST 2000

Can anyone give information on up-regulation of Parasite (by the host) that 
ensures survival?  It is written that Toxoplasma down-regulates and forms 
tissue cysts when the Host produces an immune response.  If the parasite did 
not do this, it could kill the host quickly (down-regulation increases 
Toxoplasma's opportunity to infect another host).  Is there an example of 
the opposite = the parasite up-regulates (caused by the host's immune 
response or some other reaction by the host) and its survival/reinfection 
successes are increased.  Many thanks.
H. Gieseke
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