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Shares of Seres Therapeutics Inc. rocketed nearly fourfold (up 270%) on heavy volume in premarket trading Monday, after the microbiome therapeutics company reported upbeat results of a Phase 3 trial of its SER-109 for recurrent C. difficile infections (CDI), or an infection of the colon. Trading volume ballooned to 7.1 million shares, compared with the full-day average of about 876,000 shares. Seres said the study showed that SER-109 resulted in a “highly statistically significant abs…

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