Figure 88-2. Life Cycle of other Trematodes of Human Health Significance.

Figure 88-2Life Cycle of other Trematodes of Human Health Significance

I.

Definitive Host: humans, ruminants, dogs, cats and other companion animals

1.

Operculated - type mature trematode egg with miracidium

2.

Free swimming miracidium, life cycle stage infective to snail intermediate host

II.

First Intermediate Hosts: operculated amphibious or semi-amphibious snail of the genera Bulimus sp; Pseudofossarulus sp; Lymnaea sp; Bithynia sp. and others

3.

Sporocyst

4.

Mother/daughter redia

5.

Free swimming cercariae

III.

Second Intermediate Host: (if applicable, i.e., Opisthorchis spp.) encysted in the tissue of cyprinid - type freshwater fish

6.

Cercariae encysted in the fish's soft tissue

IV.

Infective Stage to the Definitive Host

7.

Encysted metacercariae on aquatic/semi-acquatic vegetation, i.e., watercress, fodder

From: Chapter 88, Schistosomes and Other Trematodes

Cover of Medical Microbiology
Medical Microbiology. 4th edition.
Baron S, editor.
Copyright © 1996, The University of Texas Medical Branch at Galveston.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.