Fig. 6

T. spiralis larva after 48 h incubation in drug-free RPMI-1640 medium showing: (a) normal comma-shaped larva with intact cuticular folds (× 800) and (b) coiled posterior end (× 300). (c) Normal architecture of the cuticle with transverse creases (arrow) and longitudinal ridges (arrowhead) (× 3500)