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I'm A- DU variant and was told that the DU variant is what makes RH negatives resistant to toxoplasmosis and that not all RH negatives have the DU variant so not all are resistant to toxoplasmosis. I am also homozygous for CCR5 Delta 32 deletion so also resistant to HIV/AIDS and read that it is rare that HIV infects hosts who have this deletion. My question is how many proteins/receptors can different strains of the virus use to access the blood; and which strains of HIV would enter blood from these other receptors, and where on the planet do these other strains originate from?

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These other strains originate by evolution ! –  biogirl Dec 9 '13 at 17:54
    
@biogirl yes, but the OP is asking about the prevalence of different viral strains in different geographical regions. –  terdon Dec 9 '13 at 18:05

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