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Mean neutralising antibody titres in the cattle potency test with A/MAY/97 vaccine and A/IRN/22/2015 challenge. The error bars, indicating the standard error of mean, are only shown on one side to avoid overlap. In black the cattle vaccinated with a full dose of vaccine, in blue the cattle vaccinated with a 1/3 dose, in green the cattle vaccinated with a 1/9 dose and in red the non-vaccinated control cattle.
