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Study outline. A timeline of the procedures following the establishment of preimmunity are listed in panel A. Ferrets were vaccinated at day 0 and day 28. Bleeds were taken at day 14 and day 42. Ferrets were then infected on day 56 and nasal washes were taken on days 57, 59, 61, and 63. The study was terminated on day 67. The viruses used to establish different preimmunities are listed in panel B.
