A Phase 1 Trial of Intranasal Mumps Virus Vaccines in Healthy Adults

Inclusion Criteria: * Individuals ≥18 years and \<30 years of age at the time of consent. * Willing and able to comply with all scheduled visits, vaccination plan, laboratory tests and other trial procedures. * Determined by medical history, complete physical examination and clinical judgement of the investigator to be in good state of health\*. * As determined by medical history and physical examination to evaluate acute or ongoing chronic medical diagnoses/conditions that have been present for at least 90 days, which would affect the safety assessment of subjects. Chronic medical diagnoses/conditions should be stable for the last 60 days (no hospitalizations, emergency room (ER), or urgent care for condition or need for supplemental oxygen). This includes no change in chronic prescription medication, dose, or frequency due to deterioration of the chronic medical diagnosis/condition in the 60 days before enrollment. Any prescription change that is due to change of health care provider, insurance company, etc., or done for financial reasons, and in the same class of medication, will not be considered a deviation of this inclusion criterion. Any change in prescription medication due to improvement of a disease outcome, as determined by the participating site principal investigator (PI) or appropriate sub- investigator, will not be considered a deviation of this inclusion criterion. Subjects may be on chronic or as needed (prn) medications if, in the opinion of the partici…