This is a 2-part, first-in-human dose-ranging study to evaluate the safety, tolerability and pharmacokinetics of escalating doses of VNRX-5133 administered via intravenous (IV) infusion in healthy subjects. In part 1, subjects will receive a single dose of VNRX-5133; in part 2 subjects will receive VNRX-5133 for 7 days.