Seres Therapeutics, Inc. is a microbiome therapeutics platform company. The Company is engaged in developing a range of biological drugs, Ecobiotic microbiome therapeutics. It is focused on implementing its microbiome therapeutics platform to develop Ecobiotic microbiome therapeutics that treats dysbiosis in the colonic microbiome in the human body. Its products include SER-109, which is designed to prevent further recurrences of Clostridium difficile infection, (CDI), a debilitating infection of the colon; SER-109; SER-262, and SER-155. It's SER-262 is a multi-strain Ecobiotic microbiome therapeutic to be used following antibiotic treatment of primary CDI to prevent an initial recurrence of CDI. The Company is developing SER-287 to treat ulcerative colitis. It is developing SER-155, which is an Ecobiotic microbiome therapeutic to treat enteric pathogens.