Figure 1

Lung lesion scores (LS) were plotted against piglet ID. Lungs were removed 4 weeks post-infection at necropsy and M. hyopneumoniae-induced pneumonic lesions were scored as described in European Pharmacopoeia and plotted against piglet ID. Piglets from different litters showed varied susceptibility to M. hyopneumonaie challenge. Litters were represented in sequential numbers 0–5. L0 included uninoculated control piglets. Litters 1–5 included all M. hyopneumonaie experimentally inoculated piglets. Piglets from L3 and L5 showed the least LS, whereas those from L2 and L4 showed the highest LS.