Fig. 2From: In the presence of non-neutralising maternally derived antibodies, intradermal and intramuscular vaccination with a modified live vaccine against porcine reproductive and respiratory syndrome virus 1 (PRRSV-1) induce similar levels of neutralising antibodies or interferon-gamma secreting cellsEvolution of the S/P ratios in the different groups as determined by ELISA. Statistically significant differences are indicated by different superscript lettersBack to article page