Repeated vaccination is required to optimize seroprotection against H1N1 in the immunocompromised host oleh Hugues de Lavallade, Paula Garland, Takuya Sekine, Katja Hoschler, David Marin, Kate Stringaris, Eva Loucaides, Katherine Howe, Richard Szydlo, Ed Kanfer, Donald Macdonald, Peter Kelleher, Nichola Cooper, Ahmad Khoder, Ian H. Gabriel, Dragana Milojkovic, Jiri Pavlu, John M. Goldman, Jane F. Apperley, Katayoun Rezvani