Project description:An 8 hours timecourse was performed with human DCs infected either with A/California/7/2009 and A/Brevig Mission/1/1918 (pandemic) or A/New Caledonia/20/99 and A/Texas/36/91 seosonal.
Project description:An 8 hours timecourse was performed with human DCs infected either with A/California/7/2009 and A/Brevig Mission/1/1918 (pandemic) or A/New Caledonia/20/99 and A/Texas/36/91 seosonal.
Project description:An 8 hours timecourse was performed with human DCs infected either with A/California/7/2009 and A/Brevig Mission/1/1918 (pandemic) or A/New Caledonia/20/99 and A/Texas/36/91 seosonal. Human monocyte derived dendritic cells (DCs) were infected either with chicken egg grown A/California/7/2009, A/Brevig Mission/1/1918, A/New Caledonia/20/99or A/Texas/36/91. Samples were taken and fixed in RNA stabilizing regaent at 2, 2.7, 3.3, 4, 5, 6, 7 and 8 hours. Cells exposed to chicken egg alantoic fluid served as a control. Infections with A/California/7/2009, A/New Caledonia/20/99 or A/Texas/36/91 were carried out at a BSL2 enviroment. Infections with A/Brevig Mission/1/1918 were carried out in a BSL3 enviroment in parralel to the BSL2 infections with cells from the same donor and cell preparation.
Project description:An 8 hours timecourse was performed with human DCs infected either with A/California/7/2009 and A/Brevig Mission/1/1918 (pandemic) or A/New Caledonia/20/99 and A/Texas/36/91 seosonal. Human monocyte derived dendritic cells (DCs) were infected either with chicken egg grown A/California/7/2009, A/Brevig Mission/1/1918, A/New Caledonia/20/99or A/Texas/36/91. Samples were taken and fixed in RNA stabilizing regaent at 2, 2.7, 3.3, 4, 5, 6, 7 and 8 hours. Cells exposed to chicken egg alantoic fluid served as a control. Infections with A/California/7/2009, A/New Caledonia/20/99 or A/Texas/36/91 were carried out at a BSL2 enviroment. Infections with A/Brevig Mission/1/1918 were carried out in a BSL3 enviroment in parralel to the BSL2 infections with cells from the same donor and cell preparation.
Project description:The robust immune response to a single dose of pandemic 2009 H1N1 vaccine suggests that a large segment of the population has been previously primed. We evaluated the effect of seasonal (s) H1N1 infection, s-trivalent inactivated vaccine (s-TIV), and trivalent s-live attenuated influenza vaccine (s-LAIV) before immunization with a pandemic live attenuated influenza vaccine (p-LAIV) in mice. We compared serum and mucosal antibody and pulmonary CD8 and CD4 responses and the virologic response to challenge with a wild-type 2009 pandemic H1N1 (p-H1N1) virus. Two doses of p-LAIV induced cellular immune and robust ELISA and neutralizing antibody responses that were associated with complete protection from p-H1N1 challenge. A single dose of p-LAIV induced a cellular response and ELISA but not a neutralizing antibody response, and incomplete protection from p-H1N1 virus challenge. Primary infection with s-H1N1 influenza virus followed by a dose of p-LAIV resulted in cross-reactive ELISA antibodies and a robust cellular immune response that was also associated with complete protection from p-H1N1 virus challenge. A lower-magnitude but similar response associated with partial protection was seen in mice that received a dose of s-LAIV followed by p-LAIV. Mice that received a dose of s-TIV followed by p-LAIV did not show any evidence of priming. In summary, prior infection with a seasonal influenza virus or s-LAIV primed mice for a robust response to a single dose of p-LAIV that was associated with protection equivalent to two doses of the matched pandemic vaccine.