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AIDS Failure at Merck Elevates Burton Vaccine for 2 Million

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On a sunny March afternoon, Dennis Burton draws his office blinds, blocking a view of the 10th tee at La Jolla's Torrey Pines South Course and Southern California's Pacific surf.

Instead, he turns to a handful of twisted, translucent yellow models, each smaller than a bar of soap. This set of what look like dog chew toys holds the key to Burton's mission to halt the spread of AIDS, the pandemic that has killed 25 million people in a quarter century and threatens 33 million more today.