Assessment of Viral Shedding Week Following Administration of Live Attenuated Influenza Vaccine in Children

NCT ID: NCT03735147

Last Updated: 2024-04-05

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE4
• Total Enrollment: 12 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2018-10-23
• Study Completion Date: 2019-04-01

Brief Summary

LAIV shedding studies in children could be an important way to confirm whether impediments to viral replication do indeed explain these observed reductions in vaccine effectiveness (VE), whether prior vaccination has any influence on replication and what future implications (if any) this might have for the UK paediatric LAIV programme. LAIV virus replication in children will be dependent on virological and host factors. The virus factors include replicative fitness of individual strains and the susceptibility to inhibition by other replicating strains (ability to compete). Host factors which may influence this include pre-existing specific immunity as a result of prior infection or previous vaccination (with either LAIV or IIV), and innate immune factors including mucosal immunity.

There is significant variability in shedding across viral subtypes in studies done to date, so there is a need to obtain local data in a small pilot observational study which will look in detail at virus shedding by sequential daily virus samples, something not possible on a larger scale. The data generated will inform future LAIV studies in the UK in terms of optimum time of sample collection for viral shedding studies, which are likely to be required on a regular basis, to supplement field studies of vaccine effectiveness.

This study will enrol up to 30 children that will allow these factors to be assessed. Both written informed consent from parent/ guardian and written assent from the child will be in place prior to any study procedure. All participants will have a baseline assessment of pre--existing influenza immunity (blood test, oral fluid collection and nasal swabs), followed by a single dose of LAIV. Parents will then be asked to take nasal swabs at home on days 1, 2, 3, 4, 5, 6, 7, 8, with further nasal swab, blood test and oral fluid collection in hospital 4 weeks later, in order to assess for immune responses to LAIV.

Conditions

Influenza Vaccines

Study Design

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

Study Groups

All children

Administration of live attenuated influenza vaccine (LAIV)

Group Type: EXPERIMENTAL

Live attenuated influenza vaccine (LAIV)

Intervention Type: BIOLOGICAL

Single dose of LAIV

Interventions

Live attenuated influenza vaccine (LAIV)

Single dose of LAIV

Intervention Type: BIOLOGICAL

Other Intervention Names

Fluenz Tetra

Eligibility Criteria

Inclusion Criteria

• Children age 6 years to 15 years +364 days of age on enrolment
• Children eligible to receive LAIV in accordance with current UK vaccine policy
• Written informed consent given by parent/ guardian and assent from child

Exclusion Criteria

Contraindications to LAIV (notwithstanding allergy to egg protein), which include:

• Hypersensitivity to the active ingredients, gelatin or gentamicin (a possible trace residue)
• Previous systemic allergic reaction to LAIV
• Previous allergic reaction to an influenza vaccine (not LAIV) is a relative contra-indication, which must be discussed with the CI to confirm patient suitability
• Children/adolescents who are clinically immunodeficient due to conditions or immunosuppressive therapy such as: acute and chronic leukaemias; lymphoma; symptomatic HIV infection; cellular immune deficiencies; and high-dose corticosteroids*.
• Children / adolescents younger than 18 years of age receiving salicylate therapy because of the association of Reye's syndrome with salicylates and wild-type influenza infection.
• Pregnancy (determined by history). Where this cannot be confirmed, a urine pregnancy test will be performed.

• High---dose steroids is defined as a treatment course for at least one month, equivalent to a dose greater than 20mg prednisolone per day (any age), or for children under 20kg, a dose greater than 1mg/kg/day.

NB: LAIV is not contraindicated for use in individuals with asymptomatic HIV infection; or individuals who are receiving topical/inhaled/low-dose oral systemic corticosteroids or those receiving corticosteroids as replacement therapy, e.g. for adrenal insufficiency.

• Minimum Eligible Age: 6 Years
• Maximum Eligible Age: 16 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Public Health England

OTHER_GOV

Sponsor Role: collaborator

Imperial College London

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Paul J Turner, FRACP

Role: PRINCIPAL_INVESTIGATOR

Imperial College London

Locations

Imperial College Healthcare NHS Trust (St. Mary's Hospital)

London, , United Kingdom

Countries

United Kingdom

Provided Documents

Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

2018-002470-42

Identifier Type: EUDRACT_NUMBER

Identifier Source: secondary_id

18/LO/1317

Identifier Type: OTHER

Identifier Source: secondary_id

18SM4658

Identifier Type: -

Identifier Source: org_study_id