[1] Dalhousie Univ, Dept Pediat, Halifax, NS, Canada
[2] Canadian Ctr Vaccinol, Halifax, NS, Canada
[3] Dalhousie Univ, Dept Philosophy, Halifax, NS, Canada
[4] Dalhousie Univ, Off Vice President Res & Innovat, Halifax, NS, Canada
[5] Baylor Coll Med, Dept Pediat, Dept Mol Virol & Microbiol, Houston, TX 77030 USA