Confocal images showing the association of virulent (ER6-P and PC4-6P) and non-virulent (SW114) strains with PAM. The green signals correspond to FITC-labelled H. parasuis. PAM were stained with rhodamine-phalloidin (red) to label the cytoplasm and the nuclei were counterstained with DAPI (blue). Z stack images from two independent experiments were captured. Scale bar, 2 μm. (For a colour version of this figure, please consult www.vetres.org.)