My reaction.....DUH, how many Billions of $$$ in federally funded research did it take to uncover this unsuprising fact?
It's been known for many years, predating AIDS, that "T-cells" are the key resource in the immune systems ability to fight infections - both bacteriological and viral. I'm no research biologist(nor do I have ambitions to play one on TV)....but thats the first place I would look!
What government researchers invariably discover, is that more government funded research will be neccessary.