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Evaluation of virulence protective efficacy in pigs. (A–D) The viremia in pigs after inoculation and challenge. (E–H) The virus shedding in oral-swabs from pigs after inoculation and challenge. (I–L) The virus shedding in nasal swabs from pigs after inoculation and challenge. (M–P) The virus shedding in anal swabs from pigs after inoculation and challenge.
