This is an open-label, randomized study to investigate the relative bioavailability of two formulations of BCX7353 and to determine if there is a food effect

In this study, 24 healthy subjects will be randomized to receive a single dose of two formulations of BCX7353 and one of the formulations administered with a high-fat meal. A 14-day washout period will separate each dose.

Inclusion Criteria:

• written informed consent
• acceptable birth control measures for male subjects and women of childbearing potential
• complies with all required study procedures and restrictions

Exclusion Criteria:

• clinically significant medical history, current medical or psychiatric condition
• clinically significant ECG finding, vital sign measurement or laboratory/urinalysis abnormality at screening or baseline
• current use, or use of any prescribed or over the counter medication, vitamins or herbal products within 14 days of Day 1
• participation in any other investigational drug study within 90 days of screening
• recent or current history of alcohol or drug abuse
• regular recent use of tobacco or nicotine products
• positive serology for HBV, HCV, or HIV
• pregnant or nursing
• donation or loss of greater than 400 mL of blood within the previous 3 months