In addition to the trial participants, there will also be one stool donor participant. The consented, screened, and eligible stool donor will be identified from an established group of stool donors and will undergo screening procedures that are specific to this study. This individual will donate human stool for the preparation of the AHSG (known as the IND product for this study). Upon processing of AHSG, the stool donor will enter the Follow-Up Period and remain available for communication to the study team (if necessary) until the Study Completion Date. However, no scheduled study assessments are required of the stool donor.