Transfer of Healthy Gut Flora for Restoration of Intestinal Microbiota Via Enema for Patients in the Rehabilitative Phase of Malnutrition

This single-center, randomized, open-label trial will compare the safety of MTT delivered by rectal catheter enema in participants 12-60 months of age with malnutrition (moderate acute malnutrition \[MAM\] or severe acute malnutrition \[SAM\]) who are in the rehabilitative phase of treatment and have failed to respond to at least 4 weeks of standard therapy. Participants must meet inclusion criteria, no exclusion criteria prior to randomization. Participants will then be randomized in a 1:1 ratio at each site to 1 of 2 treatment groups: * MTT by rectal catheter enema: 10mL/kg (maximum 150mL, +/- 5ml) of healthy donor human intestinal microbiota will be infused. * Standard of care treatment for malnutrition as prescribed by local and national Department of Health Guidelines Participants will be evaluated through 56 days (±3) after randomization for primary outcomes (safety) as well as secondary outcomes (nutritional, clinical and microbiological response). Participant blood and urine samples will be collected at enrollment and day 56. Participant stool samples will be collected at enrollment and through days 3, 7, 21 and 56, thereafter, 3 months, 4 months, and 6 months. A caregiver stool sample will be collected at enrollment and day 56. Samples will be used for microbiome determination and other exploratory microbiological endpoints. An aliquot of donor stool will also be stored for microbiome determination and other exploratory microbiological endpoints and assessment of newly acquired infectious agents.