Assessment of Viral Shedding Week Following Administration of Live Attenuated Influenza Vaccine in Children (FluSHED-2)

Imperial College London

Status and phase

Completed

Phase 4

Conditions

Influenza Vaccines

Treatments

Biological: Live attenuated influenza vaccine (LAIV)

Study type

Interventional

Funder types

Other

Identifiers

NCT03735147

2018-002470-42 (EudraCT Number)

18/LO/1317 (Other Identifier)

18SM4658

Details and patient eligibility

About

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.

Enrollment

12 patients

Sex

All

Ages

6 to 16 years old

Volunteers

Accepts Healthy Volunteers

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.