Fig. 4

Photographs showing infected muscle tissues with T. spiralis larvae within the two control groups (groups IBa and IIBa). Staining: H&E; magnification: ×50. Blue arrows indicate inflammatory cells, red arrow indicates hyaline wall, and yellow arrow points to fragmented larvae. a, b Non-sensitized mice (group IBa), showing intact larvae inside cystic lesions surrounded by a moderate number of inflammatory cells. c, d Sensitized mice (group IIBa), showing intense inflammatory response with intact larval stages (c) and fragmented larvae or/and replacement of larvae by a hyaline material (d)