Paragonimus westermani

Paragonimus westermani. Adult worm (carmine stain, scanning power). This small, robust trematode, known as the Oriental lung fluke, lives encapsulated in the lungs of humans and other animals. It usually measures 7.5 to 12 mm long by 3 to 5 mm in thickness. The bright red-staining testes are relatively large and branched, lying side by side, posterior to the larger, red-staining, branched ovary. The uterus takes a golden color in the center of the worm and contains many small, brown-staining eggs. The reddish-staining yolk glands occupy the lateral fields, extending from the anterior to the posterior extremities, filling in toward the center of the worm.