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SER-155 cuts bloodstream infections by 77% in transplant patients, per Phase 1b study published in Nature Medicine.

Market News
03 Nov 2026, 14:00 WIB
GlobeNewsWire
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Bullish
SER-155 cuts bloodstream infections by 77% in transplant patients, per Phase 1b study published in Nature Medicine.

Seres Therapeutics announced that its Phase 1b trial results for SER-155, a live biotherapeutic designed to reduce bloodstream infections (BSIs) in allogeneic hematopoietic cell transplant (allo-HCT) patients, were published in Nature Medicine. The study showed a 77% relative risk reduction in BSIs compared to placebo, along with significantly lower antibiotic use and improved gut barrier integrity. SER-155 was well tolerated and has received FDA Breakthrough Therapy and Fast Track designations, with plans for a Phase 2 trial pending funding. The therapy also shows promise for treating immune-related gut inflammation in cancer patients, potentially allowing continued cancer treatment without immunosuppressive drugs.

Seres Therapeutics' recent Phase 1b trial results highlight a 77% relative risk reduction in bloodstream infections for allo-HCT patients. For readers following health-sector stocks, here is Pluang's market snapshot as of Nov 03, 2026 19:02 WIB: out of 150 priced US health stocks, 74 rose and 69 fell. Notable movers include INO at USD 1.78 with a 5.56% decline, NUWE at USD 4.90 down 5.41%, and AHCO at USD 6.20 up 4.91%, with typical hold times ranging from 21 to 42 days and varied buy/sell order activity.

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