Figure 2From: Anti-idiotypic antibodies reduce efficacy of the attenuated vaccine against highly pathogenic PRRSV challengeGross pathology of thymus on 28 DPC. Thymus of a piglet from Group 1 (A), Group 2 (B) and Group 5 (E) showed serious atrophy. Thymus of a piglet from Group 3 (C) and Group 4 (D) showed slight atrophy and thymus of an age-matched control piglet from Group 6 (F) was normal.Back to article page