A Study to Assess the Safety of Live Intranasal Sendai Virus Vaccine in Children and Toddlers

NCT ID: NCT00186927

Last Updated: 2025-02-19

Basic Information

• Recruitment Status: SUSPENDED
• Clinical Phase: PHASE1
• Total Enrollment: 54 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2005-05-05
• Study Completion Date: 2027-01-31

Brief Summary

Croup is an illness of young children that is caused by a virus. With this illness, the child has fever, cough, and hoarseness. Although the illness usually gets better in 2 to 4 days, some children may be admitted to the hospital and a few infants may require an intervention to help their breathing. This illness is most often caused by a virus called parainfluenza virus type 1, but it can be caused by other viruses. The experimental vaccine that is being investigated in this study is intended to try to prevent croup caused by parainfluenza virus type 1. Currently, there are no vaccines to prevent this virus, or medications available to treat the illness once infection has occurred.

This research study is testing a new experimental live-virus vaccine that is given by placing liquid drops in the nose. The Sendai virus is very similar to the virus that causes croup, but it has never been found to cause illness in people. Previous studies in animals have shown that the vaccine provided protection against the croup virus, and did not cause illness. Many people have been exposed to the Sendai virus, but no one has been known to develop illness. Several healthy adults have been given the Sendai virus vaccine being studied, and they did not experience any serious side effects or illness.

Detailed Description

The main aim of the study is to assess the tolerance and safety of escalating doses of intranasal Sendai virus in children and toddlers.

The secondary objective of the study is to assess the magnitude and duration of the immune response elicited by intranasal Sendai virus. Responses between seropositive and seronegative children will be compared.

This study also tests the safety and immunogenicity of a booster vaccination at the highest dose tolerated during primary immunization dose-escalation.

Conditions

Parainfluenza; Respiratory Viral Infections

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: PREVENTION
• Blinding Strategy: NONE

Study Groups

Participants

Participants will be studied in three cohorts:

• Healthy seropositive children 3 years up to 6 years
• Healthy seropositive toddlers 12 months up to 24 months
• Healthy seronegative toddlers 12 months up to 24 months.

Each cohort will receive Sendai virus vaccine.

Group Type: EXPERIMENTAL

Sendai virus vaccine

Intervention Type: BIOLOGICAL

Enders strain; a live, unmodified intranasally administered Sendai virus vaccine; given once in a dose escalation study, 5 x 10\^5 to 5 x 10\^7 EID(50) units.

Interventions

Sendai virus vaccine

Enders strain; a live, unmodified intranasally administered Sendai virus vaccine; given once in a dose escalation study, 5 x 10\^5 to 5 x 10\^7 EID(50) units.

Intervention Type: BIOLOGICAL

Eligibility Criteria

Inclusion Criteria

• Parent or legal guardian willing and able to give informed consent and comply with study requirements
• Child is greater than or equal to one year of age and less than six years of age
• Adequate blood, liver and kidney function
• Has not or will not receive other vaccinations within 30 days of receiving study vaccine

Exclusion Criteria

• History of allergy to eggs or gentamicin
• History of lung disease, asthma, and hospitalization for respiratory illness, immunodeficiency, sickle cell disease, or any other serious underlying condition
• Children who have a family history of primary immunodeficiency or lack history of maternal or paternal immune status
• Height or weight less than 5th percentile
• Upper respiratory tract infection (URI) or household member with URI
• Evidence of developmental delay or evolving neurological disorders
• Household member or daycare contact (i.e. stay in the same room in daycare) less than 24 months of age if same room contact is expected within 14 days of vaccination or 7 days after booster, or prior to evidence of vaccine clearance
• Immunodeficient household members or other close contacts if same room contact is expected within 14 days of vaccination or 7 days after booster, or prior to evidence of vaccine clearance
• Current use of investigational or immunosuppressive drugs (e.g., steroids)
• Current use of antibiotics or antivirals

• Minimum Eligible Age: 12 Months
• Maximum Eligible Age: 6 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

St. Jude Children's Research Hospital

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Elisabeth Adderson, MD

Role: PRINCIPAL_INVESTIGATOR

St. Jude Children's Research Hospital

Locations

St. Jude Children's Research Hospital

Memphis, Tennessee, United States

Countries

United States

References

Adderson E, Allison KJ, Branum K, Sealy RE, Jones BG, Surman SL, Penkert RR, Hayden RT, Russell CJ, Portner A, Slobod KS, Hurwitz JL. Intranasal Sendai Virus Vaccination of Seropositive Children 1 to 2 Years of Age in a Phase I Clinical Trial Boosts Immune Responses Toward Human Parainfluenza Virus Type 1. Vaccines (Basel). 2025 Apr 19;13(4):430. doi: 10.3390/vaccines13040430.

Reference Type: DERIVED

PMID: 40333329 (View on PubMed)

Related Links

http://www.stjude.org

St. Jude Children's Research Hospital

https://www.stjude.org/research/clinical-trials/sendai-infectious-disease/croup-study.html

Croup Study Volunteer Recruitment Information

http://www.stjude.org/protocols

Clinical Trials Open at St. Jude

Other Identifiers

SENDAI

Identifier Type: -

Identifier Source: org_study_id