Error message

Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in book_prev() (line 775 of /home/pathwa23/public_html/modules/book/book.module).


  • Parasitology is the study of eukaryotic parasites. Protozoa are unicellular free-living organism while helminths are multicellular worms. In this section we only discuss protozoa and do not cover helminths. Parasites often possess complex life cycles in which the organism passes through multiple hosts and may take different forms in each.