Seres Therapeutics, Inc., a microbiome therapeutics platform company, engages in developing biological drugs that are designed to treat disease by restoring the function of a dysbiotic microbiome. The company's advanced program is the SER-109, which is in Phase III clinical development for reducing recurrent clostridium difficile infection (CDI). It is also developing SER-287 that is in Phase IIb study in patients with active mild-to-moderate ulcerative colitis; and SER-401, which is in Phase Ib study in metastatic melanoma to augment the efficacy of anti-PD-1 immunotherapy. In addition, the company engages in the development of SER-301, an Ecobiotic microbiome therapeutic candidate for the treatment of inflammatory bowel disease; and SER-109, a donor-derived purified bacterial spore-based microbiome therapeutic candidate that is in Phase III clinical trial to correct dysbiosis in the colonic microbiome in the setting of recurrent CDI. Further, it is developing SER-262, a multi-strain