trophozoites

(noun)

A protozoan in the feeding stage of its life cycle.

Examples of trophozoites in the following topics:

  • Amoebic Dysentery (Amoebiasis)

    • The ameoba also demonstrates the ability to spread as free amoebae or trophozoites, meaning the cysts are not absolutely necessary; however, these states do not survive long outside of the host.
    • The amoebae or trophozoites are able to divide via binary fission and and produce cysts.
    • Interestingly, individuals can be asymptomatic if infected with trophozoites and can function as carriers by passing cysts in their stool.

  • Protozoa

    • ., trophozoites) and dormant cysts.
    • When protozoa are in the form of trophozoites they actively feed.
    • The conversion of a trophozoite to cyst form is known as encystation, while the process of transforming back into a trophozoite is known as excystation .

  • Giardiasis

    • The cysts and trophozoites, found in the fecal matter, are extremely resistant to harsh environments.
    • Once in the host, the trophozoites multiply via binary fission.
    • A scanning electron micrograph of the surface of the small intestine of a gerbil infested with Giardia sp. protozoal, present in the trophozoite stage.

  • Cryptosporidiosis

    • The sporozoites then develop into trophozoites and undergo asexual reproduction via schizogony.
    • The trophozoites then develop into Type 1 and Type 2 merozoites which can either cause auto infection (Type 1) or undergo releasal and attach the epithelial cells (Type 2).

  • Malaria

    • In the red blood cells, they develop into ring forms called trophozoites and schizonts that in turn, produce further merozoites.