Inclusion Criteria:  Inclusion Criteria for patients:  ≥ 18 years and < 105 years Colonized with a carbapenem-resistant Enterobacteriaceae (CRE) at inclusion on stool culture and/or colonized with an extended spectrum β-lactamase producing Enterobacteriaceae (ESBL-E) at inclusion on stool culture AND having suffered from an infection with an ESBL-E in the previous 12 months Capable of taking oral capsules (25 per day for two days in a row) with no dysphagia or swallowing disorders.  Inclusion Criteria for healthy volunteers donors:  Healthy subjects ≥ 18 years and < 50 years Body mass index < 30 kg/m^2 Regular bowel movement defined as at least 1 stool and maximum than 3 stools per day Subjects acceptable for stool donation according to the published recommendations for clinical and microbiological screening of the subject and of the stool of the Agence nationale de sécurité du médicament et des produits de santé (ANSM) in 2016 and according to ANSM safety precautions regarding SARS-CoV2 virus.  Exclusion Criteria:  Exclusion Criteria for patients:  Antibiotic treatment on the day of inclusion except for long term antibiotic prophylaxis (for at least 3 months/year) Patients hospitalized in the intensive care unit Pregnancy or breastfeeding during the study Women of childbearing potential who are unwilling or unable to use an acceptable method of birth control [such as oral contraceptives, other hormonal contraceptives (vaginal products, skin patches, or implanted or injectable products), or mechanical products such as an intrauterine device or barrier methods (condoms)] to avoid pregnancy for the entire study Patient under legal guardianship Participation in another trial Non-affiliation to a social security scheme (AME excepted) No written informed consent for participation in the study  Exclusion Criteria for healthy volunteers donors:  Any history of or current proctologic disease or any acute condition, which in the investigator's judgment could harm the volunteer and/or compromise or limit the evaluation of the protocol or data analysis (for details, please see protocol) Subject under legal protection Participation in any other interventional study Non-affiliation to a social security scheme (AME excepted) No written informed consent for participation in the study