Distinct immune responses and virus shedding in pigs following aerosol, intra-nasal and contact infection with pandemic swine influenza A virus, A(H1N1)09 por Hemmink, JD, Morgan, SB, Aramouni, M, Everett, H, Salguero, FJ, Canini, L, Porter, E, Chase-Topping, M, Beck, K, Loughlin, RM, Carr, BV, Brown, IH, Bailey, M, Woolhouse, M, Brookes, SM, Charleston, B, Tchilian, E