Parasitology 1

Characteristics of Kingdom Protista Parasites

• Single celled protozoans

• Eukaryotic

• Varied life cycle & modes of transmission

• invade gastrointestinal tract, blood, organs, & tissues

Name A on the Amoeba Model

Contractile Vacuole

Name B on the Amoeba Model

Cytoplasm

Name C on the Amoeba Model

Food Vacuoles

Name D on the Amoeba Model

Pseudopod

Name F on the Amoeba Model

Nucleus

Entamoeba histolytica

MOT: Fecal / Oral (ingestion of cyst)

Infective stage: Cyst

Hosts: Human

Parts to look for: small bullseye nucleus & central karyosome

Balantidium coli

MOT: Fecal / oral - ingestion of cyst

Infective Stage: Cyst

Hosts: Humans & other animals

Animal reservoir - primates, rodents, & pigs

Parts to look for: large kidney bean-shaped nucleus

Giardia lamblia

MOT: Fecal/oral - ingestion of cyst

Infective Stage: Cyst

Hosts: Humans & other animals

Parts to look for: Heart-shaped, flagella, two nuclei, organelles positioned in a way that looks like a face

Acanthamoeba spp.

MOT: Contact with amoeba in contaminated soil or water

Infective stage: Trophozoite or cyst

Hosts: human

Parts to look for: Karyosome takes up half of the nucleus

Naegleria fowleri

MOT: diving & swimming (water enters nose)

Infective stage: bi-flagellate trophozoite

Hosts: human

Parts to look for: a large karyosome that takes up the whole nucleus

Trichomonas vaginalis

MOT: Sexual intercourse

Infective Stage: Trophozoite (no cyst form)

Hosts: Humans

Parts to look for: Pear-shaped, undulating membrane, flagella, & the axostyle