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Mean values of the serum neutralizing antibodies (NA) titer in the different groups; vaccinated challenged (T01; □), vaccinated non-challenged (T02; ▲), non-vaccinated challenged (T03; ○), and non-vaccinated non-challenged (T04; ♦) animals. Variation is expressed as the standard deviation. Significant difference (T01 and T02 vs. T03 and T04) is indicated at p value <0.01*. Significant difference (T01 vs. T02) is indicated at p value <0.05†.
