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Survival of pigs immunised with OURT88/3 or OURT88/3ΔI329L or control pigs after challenge with virulent virus. The percentage of pigs that survive challenge is shown on the y-axis and days post-challenge on the x-axis. Pigs immunised with OURT88/3 are shown in red, with OURT88/3ΔI329L in blue. Control pigs are shown in green.
