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Effect of Age and Prior Immunity on Response to H1N1 Vaccines in Children

2014-08-27 03:14:47 | BioPortfolio

Summary

A total of 51 children between the ages of 4 and 9 will be randomized to receive a two dose schedule of either licensed live attenuated A/California/07/09 influenza vaccine (LAIV) or licensed inactivated A/California/07/09 influenza vaccine (IIV) or IIV followed by LAIV separated by 28 days. Children with prior vaccination or natural infection with novel H1N1 influenza will be excluded. Randomization will be stratified by pre-existing HAI titers to the previous winter's seasonal H1N1 A/Brisbane/57/07 reference virus.

Description

The study will be conducted as a randomized, prospective, open-label evaluation of the clinical tolerability, vaccine virus shedding, and serum and mucosal antibody response to vaccination with either live monovalent novel H1N1 influenza vaccine (LAIV) or monovalent inactivated novel H1N1 influenza vaccine (IIV) in healthy children between the ages of 4 and 9 years. Children will be screened for antibody to A/Brisbane/57/07 (H1N1) and A/California/07/09 (H1N1) prior to randomization. Children with evidence of prior exposure to the 2009 pandemic H1N1 virus will be excluded. Those with antibodies to A/Brisbane/57/07 (H1N1) will be stratified by preexisting antibody. Vaccine will be administered on days 0 and 28.

Safety of vaccination will be assessed using symptoms collected by parents for 7 days after each dose of vaccine. Serum will be obtained prior to and on day 28 following each dose of vaccine and assessed for antibody by HAI, ELISA, B-cell ELISPOT and neutralization techniques. Nasal secretions will be obtained by nasal aspiration prior to and on day 28 after each dose and assessed for HA-specific IgA antibody by ELISA. Nasal swabs will be obtained on days 2, 4, and 7 after each dose of live vaccine and assessed for the presence and magnitude of vaccine virus shedding of the live attenuated vaccine by rtRT-PCR and TCID50 on MDCK cells.

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Conditions

2009 H1N1 Influenza

Intervention

Live Attenuated H1N1 Influenza Vaccine, Influenza A (H1N1) 2009 Monovalent Vaccine, Influenza A (H1N1) 2009 Monovalent Vaccine/ Influenza A (H1N1) Monovalent Vaccine Live

Location

University of Rochester Medical Center, Vaccine Research Unit Room 3-5000
Rochester
New York
United States
14642

Status

Recruiting

Source

University of Rochester

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:14:47-0400

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