Phase I Trial of a Single Dose of CRS3123

Exclusion criteria

• Medical condition that precludes participation, including the following: a. Hypertension with confirmed systolic blood pressure \>140 mmHg or confirmed diastolic blood pressure \>90 mmHg, measured after 10 - 15 minutes of rest b. Morbid obesity (BMI\>35) c. Current diagnosis of pulmonary disease d. Current diagnosis of asthma, which has required use of asthma medications within the past year e. History of or current diagnosis of diabetes f. Autoimmune disorder, such as lupus, Wegener's, rheumatoid arthritis g. History of malignancy except low-grade skin cancer, (i.e., basal cell carcinoma has been surgically cured) h. Chronic renal, hepatic, or pulmonary disease condition that could interfere with the absorption of the study drug (e.g., surgical resection of significant proportions of the stomach or bowel, gastric bypass, gastric banding, irritable bowel syndrome, inflammatory bowel disease) i. History of known Clostridium difficile infection j. Blood donation within the previous 6 weeks k. History of cardiac rhythm abnormality including Wolff/Parkinson/White syndrome l. History of prolonged QT interval m. History of ovarian cysts -Prolongation of QTcB interval (i.e., confirmed QTcB interval \>450 milliseconds) -Clinically significant abnormal electrocardiogram at screening in the judgment of the investigator, or based on the formal ECG reading; history of any cardiac abnormalities, including conduction abnormalities such as Wolff-Parkinson-White, dysrhythmias, or coronary artery disease -Laboratory values outside the expanded ranges in Appendix B for the following tests: blood cell counts (white blood cell counts \[WBC\], hemoglobin, platelets), serum chemistry (sodium, potassium, calcium, chloride, CO2, creatinine, glucose, BUN, AST, AP, ALT, total bilirubin, protein, albumin, amylase), urinalysis for glucose, protein and blood(with proviso for re-testing females in Section 6). If CK is above normal range at baseline, but not clinically significant, the subject can be included. -Positive serology results for HIV, HBsAg, or HCV antibodies -Febrile illness with temperature documented \>38 degrees C within 7 days of dosing -Pregnancy or breastfeeding -Known allergic reactions to study drug components, including ingredients present in the formulation. -Treatment with another investigational drug within 30 days of dosing -Lack of ability to fully understand the informed consent. This will be determined by the recruiter/interviewer after explaining the consent and observing the subject reading the consent. -Ingestion of prescription medications, grapefruit juice, or St John's Wort starting 14 days or 5 half-lives before dosing, whichever is longer. Women may use oral contraceptives. -Ingestion of herbal supplements or over-the-counter medications starting 7 days before dosing -Use of any form of tobacco, including cigarette smoking, pipe smoking, or oral tobacco; if a former smoker or tobacco user, the subject must not have used tobacco for 30 days before screening -Any specific condition that, in the judgment of the Investigator, precludes participation because it could affect subject safety