Inclusion Criteria:  Male or female subjects aged 18 - 65 years of age, inclusive, in good general health as determined by medical evaluation Subject receives a negativeSARS-CoV-2 PCR test result at their screening or baseline visit  Exclusion Criteria:  Subjects will be excluded if they have clinically significant underlying conditions associated with high risk for severe COVID-19 infections as identified by the Centers for Disease Control and Prevention (CDC) (Appendix 2). These conditions include, but are not limited to: chronic obstructive pulmonary disease, diabetes mellitus (Type 1 and 2), obesity, hypertension, heart disease, and cerebrovascular disease.