Evaluating the Safety and Immune Response to a Single Dose of a Respiratory Syncytial Virus (RSV) Vaccine in RSV-Seronegative Infants and Children

RSV is the most common viral cause of serious acute lower respiratory illness (LRI) in
infants and children under 5 years of age around the world. RSV illness can range from mild
upper respiratory tract illness (URI) to severe LRI, including bronchiolitis and pneumonia.
This study will evaluate the safety and immunogenicity of an RSV vaccine in healthy
RSV-naïve children.

At study entry, participants will undergo a medical history review, physical examination,
blood collection, and a nasal wash. Participants will be randomly assigned to receive the
RSV vaccine or placebo at a 2:1 ratio, to be administered as nose drops. Subjects will be
actively monitored for 28 days following administration of vaccine or placebo; monitoring
will include medical history reviews, clinical assessments, and at some visits, nasal
washes. On the days when no study visit is scheduled, study researchers will contact
participants' parents or guardians for medical follow-up. At a study visit on Day 56,
participants will undergo a medical history review, blood collection, and a nasal wash
procedure.

From November through March following each subject's study participation, parents or
guardians will report respiratory and/or febrile illnesses on a weekly basis via telephone
calls to study researchers. Participants may have additional study visits that may include
blood collection and/or nasal wash procedures during this follow-up period.

This protocol is a companion study to P1114; a study being conducted by the Center for
Immunization Research (CIR, Johns Hopkins, Baltimore), and the Laboratory of Infectious
Diseases (NIAID, Bethesda). The protocols have identical primary and secondary objectives;
immunization schedules; evaluation assays and schedules; safety monitoring and reporting.
The protocols will vary slightly in site selection requirements, eligibility requirements
and site monitoring. These are all operational issues modified to account for the IMPAACT
sites' operations and infrastructure.

Inclusion Criteria:

- At least 6 months to less than 25 months of age at the time of enrollment

- Parents/guardians who demonstrate their understanding of the study (by taking the
comprehension assessment), sign the informed consent, and agree 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 enrollment

- Participant's history has been reviewed and participant has undergone a physical
examination indicating that s/he is in good health

- In the view of the site investigator, the participant has received routine
immunizations appropriate for their age

- 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 30
days of study entry. NOTE: Topical steroids, topical antibiotic, and topical
antifungal medications are acceptable within 24 hours of enrollment. May be
reassessed after symptoms have resolved.

- Bone marrow/solid organ transplant recipients

- Major congenital malformations, including congenital cleft palate, cytogenetic
abnormalities, or serious chronic disorders

- Previous immunization with an RSV vaccine or previous receipt of or planned
administration of any anti-RSV antibody product

- 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.
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 also be enrolled.

- Member of a household that includes an immunocompromised individual or 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. Children
who attend facilities that separate children by age and minimize opportunities for
transmission of virus through direct physical or aerosol contact are acceptable.

- Fever (rectal temperature of greater than or equal to 100.4°F [38°C]), or upper
respiratory illness (rhinorrhea, cough, or pharyngitis) or nasal congestion (that is
significant enough to interfere with successful vaccination), or otitis media

- 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 or is scheduled to receive any
immunization in the 28 days after enrollment

- Receipt of another investigational vaccine or investigational drug within 28 days of
receiving this investigational RSV vaccine

- Has received antibiotics or systemic or nasal steroid therapy or other prescription
medications for acute illness within 3 days of study entry. 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.

- Has received salicylate (aspirin) or salicylate-containing products within the past
month

- Infants born at less than 37 weeks gestation and less than 1 year of age