Seres Therapeutics, Inc. is a microbiome therapeutics platform company. The Company is engaged in developing a class of biological drugs, which is referred as Ecobiotic microbiome therapeutics. The Company's drugs are designed to restore health by repairing the function of a dysbiotic microbiome. The Company is focused on implementing its microbiome therapeutics platform to develop Ecobiotic microbiome therapeutics that treats dysbiosis in the colonic microbiome. SER-109 is its lead product candidate, which is designed to prevent further recurrences of Clostridium difficile infection (CDI). The Company is developing additional product candidates, including SER-262 to prevent an initial recurrence of primary CDI; SER-287 and SER-301, to treat inflammatory bowel disease (IBD), including ulcerative colitis, and SER-155 to treat enteric bacterial pathogens.