Decolonization of Gram-negative Multi-resistant Organisms (MDRO) with Donor Microbiota (FMT)

Inclusion Criteria: * Participants must be at least 18 years of age, and must sign the 'informed consent' form and thus agree with the data collection, sampling and FMT. * At least 2 consecutive confirmations of MDRO colonization in faeces, which complicate the necessary follow-up and/or therapy for the patient. * Participants must be able to endure the treatment (evaluated by treating physician). Exclusion Criteria: * Inflammatory bowel disease (Crohn's disease, ulcerative colitis ...) * Diagnosed hereditary blood disease (Haemophilia, Von Willebrand ...) * Chronic liver disease * Active drug use or alcohol abuse / dependence, which according to the researchers' opinion may interfere with the patient's participation in the study * Simultaneous use of probiotics (except yoghurt) * Existing immune deficiency (congenital or acquired), or concomitant immunomodulatory treatment (including systemic corticosteroids) in the 12 weeks prior to randomization, nasal or inhaled corticosteroid use is permitted * Positive pregnancy test (or potentially pregnant) * Breastfeeding * Severe food allergy (anaphylaxis, urticarial) * Antibiotic treatment up to 7 days before FMT, or planned to start within one month after FMT.