Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Phase 2B Prospective, Randomized, Double-blinded, Placebo-controlled Clinical Study Demonstrating the Efficacy and Safety of Rebiotix RBX2660 (Microbiota Suspension) for the Treatment of Recurrent Clostridium Difficile Infection
Brief Summary: This is the first prospective, multi-center, double-blinded, randomized controlled study of a microbiota suspension derived from intestinal microbes. Patients who have had at least two recurrences of C. difficile infection (CDI) after a primary episode and have completed at least two rounds of standard-of-care oral antibiotic therapy or have had at least two episodes of severe CDI resulting in hospitalization may be eligible for the study. Patients whose CDI returns in less than 8 weeks after the last assigned study treatment may be eligible to receive up to 2 treatments with RBX2660 in the open-label portion of the study.


Options:
A: Inclusion Criteria:

* ≥ 18 years
* Medical record documentation of recurrent CDI either: a) at least two recurrences after a primary episode and has completed at least two rounds of standard-of-care oral antibiotic therapy or b) has had at least two episodes of severe CDI resulting in hospitalization.
* Documented history that the subject's recurrent CDI is controlled while on antibiotics even if the subject is not currently on antibiotics.
* A positive stool test for the presence of C. difficile within 60 days prior to enrollment.

Exclusion Criteria:

* A known history of continued C. difficile diarrhea while taking on a course of antibiotics prescribed for CDI treatment.
* Requires antibiotic therapy for a condition other than recurrent CDI.
* Previous fecal transplant prior to study enrollment.
* History of inflammatory bowel disease (IBD), e.g., ulcerative colitis, Crohn's disease, or microscopic colitis.
* History of irritable bowel syndrome (IBS).
* History of chronic diarrhea.
* History of celiac disease.
* Colostomy.
* Planned surgery requiring perioperative antibiotics within 6 months of study enrollment.
* Life expectancy of \< 12 months.
* Compromised immune system.
B: Inclusion Criteria:

1. Age \> 18 and \< 90 years at the time of Screening.
2. Diagnosis of at least 3 episodes of recurrent CDI, with each episode defined as presence of diarrhea (\> 3 unformed stools/24 hours) associate with positive stool Clostridium difficle toxin, occurring within 3 months of each other.
3. CDI infection under symptomatic control with \< 3 loose/unformed BM's per 24 h period for at least 2 consecutive days before procedure.
4. Those with ability to provide informed consent.

Exclusion Criteria:

1. Those with complicated CDI, defined as white blood cell\>35 or \<0.5 x 109/L, significant abdominal pain and distension with evidence of toxic megacolon or pseudomembranous colitis, hypotension defined as systolic blood pressure \< 90 mmHg unresponsive to fluid resuscitation, end organ failure, or requiring intensive care unit admission.
2. Those with chronic diarrheal illness, such as irritable bowel syndrome or inflammatory bowel disease unless they are in remission for at least 3 months prior to enrollment.
C: Inclusion criteria:

* Recurrent C. difficile infection (identified by positivity of C. difficile toxin in stools) with severe clinical picture (defined by the ESCMID Guidelines published in 2014 - Debast et al, Clin Microbiol Infect 2014)
* Possibility to undergo standard antimicrobial therapy for recurrent C. difficile infection Approval of informed consent
* Possibility to undergo protocol diagnostic and therapeutic procedures
* Stool negativity for parasites
* Stool negativity for Salmonella spp., Shigella spp., Yersinia enterocolitica, Campylobacter, Streptococcus agalactiae, Staphylococcus aureus, enteropathogenic Escherichia coli and other microorganisms except for C. difficile
* Blood negativity for: Hepatitis A virus-Immunoglobulin M, HBsAg, Anti-Hepatitis C Virus, Anti-Human Immunodeficiency Virus1-2, venereal disease reaction level (VDRL).

Exclusion Criteria:

* Subjects \<18 years old
* Prior colectomy
* Negativity of C. difficile toxin in stools
* Mild clinical picture of C. difficile infection
* High risk of post-colonoscopy complications
* Other main gastrointestinal diseases (es. Crohn's disease or ulcerative colitis)
* Stool positivity for parasites
* Stool positivity for Salmonella spp., Shigella spp., Yersinia enterocolitica, Campylobacter, Streptococcus agalactiae, Staphylococcus aureus, enteropathogenic Escherichia coli and other microorganisms except for C. difficile
* Blood positivity for: Hepatitis A virus-Immunoglobulin M, HBsAg, Anti-Hepatitis C Virus, Anti-Human Immunodeficiency Virus1-2, venereal disease reaction level (VDRL).
* Pregnancy or breastfeeding.
* Inability to follow protocol procedures
D: Inclusion Criteria:

1. Adult outpatients (age ≥18 and \<75) referred to one of the study centers after suffering a third (or further) documented episode CDI and
2. who have failed to maintain CDI cure after standard therapy with oral vancomycin.

   * Previous treatment with at least one course of tapered/pulse dose vancomycin as per SHEA-IDSA C difficile treatment guidelines or -Inability to taper or stop vancomycin without developing diarrhea requiring anti-infective therapy. -

Exclusion Criteria:

* Patients who are aged 75 years or greater.
* Patients who are pregnant
* Patients who are nursing
* Patients who are incarcerated
* Patients with cognitive impairment or severe neuropsychiatric co morbidities who are incapable of giving their own informed consent
* Patients who are immunocompromised specifically:
* HIV infection (any CD4 count)
* AIDS-defining diagnosis or CD4\<200/mm3
* Inherited/primary immune disorders
* Immunodeficient or Immunosuppressed due to medical condition/medication:
* Current or recent (\<3 most) treatment with anti-neoplastic agent
* Current or recent (\<3 mos) treatment with any immunosuppressant medications (including but not limited to monoclonal antibodies to B and T cells, anti-TNF agents, glucocorticoids, antimetabolites (azathioprine, 6-mercaptopurine), calcineurin inhibitors (tacrolimus, cyclosporine), mycophenolate mofetil). Subjects who are otherwise immunocompetent and have discontinued any immunosuppressant medications 3 or more months prior to enrollment may be eligible to enroll.
* Patients with a history of severe (anaphylactic) food allergy
* Patients who have previously undergone FMT
* Patients who are unwilling or unable to undergo colonoscopy
* Patients with untreated, in-situ colorectal cancer
* Patients with a history of inflammatory bowel disease (ulcerative colitis, Crohn"s disease or microscopic colitis) or irritable bowel syndrome
* Unable to comply with protocol requirements
* Patients who are American Society of Anesthesiologists (ASA) Physical Status classification IV and V
* Patients with acute illness or fever on the day of planned FMT will be excluded (not undergo randomization or treatment with FMT) with the option of including that subject at a future date.

Answer: A