Almost exactly 4 years ago, Seres Therapeutics $MCRB experienced one of those soul-crunching failures that can raise big questions about a biotechs future. Out front in their pursuit of a gut punch to C. difficile infection (CDI), the Phase II test was a flat failure, and investors wiped out a billion dollars of equity value that never returned in the years that followed.

Seres, though, pressed ahead, changing out CEOs a year ago bidding Merck vet Roger Pomerantz farewell from the C suite and pushing through a Phase III, hoping that amping up the dosage would make the key difference. And this morning, they unveiled a claim that they had aced the Phase III and positioned themselves for a run at a landmark FDA OK.

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UPDATED: After a 4-year sojourn, struggling microbiome pioneer Seres claims a breakout PhIII comeback. And shares respond in frenzied spike -...