BBC News - Immune upgrade with CCR5 delta gives 'HIV shielding'

researchers at the University of Pennsylvania are adapting patients' own immune systems to give them the defence offered by the CCR5 delta chemokine receptor .
Millions of T-cells were taken from the blood and grown in the laboratory until the doctors had billions of cells to play with.
The team then edited the DNA inside the T-cells to give them the shielding mutation - known as CCR5-delta-32.
About 10 billion cells were then infused back in, although only around 20% were successfully modified.
When patients were taken off their medication for four weeks, the number of unprotected T-cells still in the body fell dramatically, whereas the modified T-cells seemed to be protected and could still be found in the blood several months later.

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