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Virus shedding at day 8 after challenge (postinfection). Cloacal virus shedding and tracheal virus load were measured for Mono-M2e (monomeric M2e), TetraM2e (tetrameric M2e), PBS, and control negative. Black: cloacal shedding gray: tracheal shedding. ∗was significantly different (P < 0.05).
