The Delta 32 genetic mutation prevents HIV; it's been found in the DNA of those who didn't get this Medieval scourge
...... 
and CCR5 delta 32 deletion suggest the effect of both genes on HIV disease... [DOC] [TLE] September 2011 Epidemics and AIDS Update [PAR] Sep 1, 2011 ... Co-infection with hepatitis delta increases risk of death for patients with ... 
Sangamo's Blood-Cell Gene Therapy Fights HIV Without Drugs ..... said, because 
only about 0.0001 percent of the DNA found in these ..... high because it's hard to 
see how this polar dianion gets out unless there's a specific channel.