Safety and Immune Response to a Live-Attenuated Respiratory Syncytial Virus (RSV) Vaccine in RSV-Seronegative Infants and Children

Inclusion Criteria:

• Participant is at least 6 months but less than 25 months of age at the time of inoculation
• Parent or guardian who demonstrates their understanding of the study, signs the informed consent, and agrees to vaccine administration following detailed explanation of the study
• Seronegative for RSV antibody, defined as a serum RSV neutralizing antibody titer less than 1:40 as determined within 42 days prior to inoculation
• Participant's history has been reviewed and participant has undergone a physical examination indicating that s/he is in good health. Permitted concomitant medications include nutritional supplements, medications for gastroesophageal reflux, eye drops, and topical medications, including topical steroids, topical antibiotics, and topical antifungal agents.

• Participant has received routine immunizations appropriate for age, administered:

  1. at least 2 weeks prior to study vaccine inoculation (inactivated and subunit vaccines and rotavirus vaccine) OR
  2. at least 4 weeks prior to study vaccine inoculation (all other live vaccines)
• Participant is expected to be available for the duration of the study

Exclusion Criteria:

• Known or suspected impairment of immunological functions, including maternal history of positive HIV test
• Receipt of immunosuppressive therapy including systemic corticosteroids within the past 30 days. NOTE: Topical steroids, topical antibiotics, and topical antifungal medications are acceptable.
• Bone marrow/solid organ transplant recipient
• Major congenital malformations, including congenital cleft palate, cytogenetic abnormalities, or serious chronic disorders
• Previous immunization with an RSV vaccine
• Previous serious vaccine-associated AE or any anaphylactic reaction
• Known hypersensitivity to any vaccine component
• Lung or heart disease, including any wheezing event or reactive airway disease. NOTE: Participants with clinically insignificant cardiac abnormalities requiring no treatment may be enrolled. Participants who had one episode of wheezing or received bronchodilator therapy for a single episode of illness in the first year of life but who have not had any additional wheezing episodes or bronchodilator therapy for at least 12 months may be enrolled.
• Member of a household that contains an immunocompromised individual
• Member of a household that contains infants less than 6 months of age
• Attends day care with infants less than 6 months of age, and whose parent/guardian is unable or unwilling to suspend daycare for 14 days following immunization. NOTE: Children who attend facilities that separate children by age and minimize opportunities for transmission of virus through direct physical or aerosol contact are acceptable.

Temporary Exclusion Criteria:

The following are temporary or self-limiting conditions. Once resolved, the participant may be enrolled, if otherwise eligible, and if the period of temporary exclusion has been less than 42 days from screening. Otherwise, the participant will need to be rescreened.

• Participant has a rectal temperature of greater than or equal to 100.4°F on the day of planned vaccination, or URI (rhinorrhea, cough, or pharyngitis) or nasal congestion significant enough to interfere with successful vaccination, or otitis media
• Participant has received any killed vaccine or live attenuated rotavirus vaccine within the last 2 weeks, any other live vaccine within the last 4 weeks, or gamma globulin (or other antibody products) within the past 3 months
• Receipt of another investigational vaccine or investigational drug within the prior 28 days of receiving the study inoculation
• Participant has received antibiotics or systemic or nasal steroid therapy for acute illness within the previous 3 days prior to vaccination. NOTE: Permitted concomitant medications include nutritional supplements, medications for gastroesophageal reflux, eye drops, and topical medications, including (but not limited to) topical steroids, topical antibiotics, and topical antifungal agents.
• Participant has received salicylate (aspirin) or salicylate-containing products within the past month
• Participant born at less than 37 weeks gestation and is currently less than 1 year of age