Figure 2.

Scanning electron microscopy of C. elegans infection by H. zoospora. (A) Gun cell attached to the host cuticle. Arrowhead points to the inflated adhesorium. (B) Protrusions underneath the cuticle surface which correspond to injected sporidia and indicate multiple sites of infection 6 hours post pathogen exposure. (C) Zoomed image of orange box in B showing a sporidium underneath the cuticle. Note that there is no noticeable damage in the cuticle post injection. (D) Exit tubes develop through the cuticle to allow release of gun cells 24-48 hours post pathogen exposure. Arrowheads point to some exit tubes. Scale bars in (A, C) are 2 µm and in (B, D) are 20 µm.