Imagine this: A vaccine that could stop Alzheimer’s disease in its tracks.

A treatment that could spare millions of families the pain and heartbreak of watching someone they love slip away is now in clinical trials in Boston.

“What we’re doing, it’s never been done before,” said Dr. Howard Weiner, co-director of the Ann Romney Center at Brigham and Women’s Hospital.

Weiner has been working on the nasal spray vaccine for almost two decades. The treatment relies on an immune modulator called Protollin, a drug made up of proteins derived from bacteria. It is designed to activate white blood cells to start clearing the plaque build-up on the brain, a hallmark of the disease.

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