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Survival curves of chickens inoculated with WT or KO UDL01 influenza virus. Survival curves of chickens inoculated into the nares with 100 µl of PBS containing (a) 5×103 p.f.u. (low dose) or (b) 1×105 p.f.u. (high dose) of either WT (blue line) or KO (red dashed line) UDL01 influenza virus.
