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Concept Dis. Ch 7

Animal Parasites

individual infected with a disease-producing organism host
simple one-celled animal parasites protozoa
an examples of protozoa is plasmodium causing malaria
complex multi-celled animal parasites metazoa
invertebrate animal w/jointed limbs & segmented body arthropod
insects and spiders are examples of arthropods
worms & flukes are examples of metazoa
crab louse and organism causing scabies are important arthropods that parasitize humans
small intracellular parasites of birds, animals, & humans Toxoplasma gondi
small parasitic worm infecting humans, which lives in lower bowel pinworm
in humans pinworm causes perianal pruritis
parasite of pubic area, which causes intense itching crab louse
particularly dangerous for individuals lacking a spleen Babesiosis
severe amebiasis can cause abscesses in the liver
Trichomonads are a sexually transmitted parasite
Giardia is transmitted contaminated water
to avoid Toxoplasma, pregnant women should not handle cat feces
there is currently no specific treatment for cryptosporidia; it is particularly dangerous for people already infected with AIDS
can be eliminated from water through filtration Cryptosporidia
roundworm that is typically transmitted through undercooked pork is Trichinella
can move from the pulmonary system to the digestive tract Ascaris worms
commonly are located in the intestine tapeworms
Crab louse infestation responds to anti-parasitics
parasitizes intestinal tract and can cause severe diarrhea Cryptosporidium parvum
Cryptosporidium parvum causes cryptosporidiosis
organisms adapted to living within or on body of another host animal parasites
malaria, amoebic dysentery, African sleeping sickness, cryptosporidiosis, toxoplasmosis, giardiasis are all protozoal infections
protozoa release toxins and enzymes that destroy cells or interfere with their functions
caused by various species of Plasmodium malaria
caused by pathogenic ameba, Entamoeba histolytica Amebic dysentery
caused by Trichomonas vaginalis genital tract trichomonad
caused by Giardia lamblia, infects small intestine; crampy abdominal pain Giardiasis
caused by Toxoplasma gondii, may infect fetus of pregnant woman and cause congenital malformations Toxoplasmosis
does not cause disease in immunocompetent persons but causes a severe, sometimes fatal pulmonary infection in persons with HIV/AIDS Pneumocystis pneumonia, caused by Pneumocystis carinii
large roundworm that lives within intestinal tract and eggs discharge in feces Ascaris
Pinworms migrate out of a colon through the anus while the infected individual is asleep depositing its eggs on the perianal skin
humans can become infected with tapeworms by eating the flesh of an infected animal that contains the larvae of the parasite
thick, fleshy, short worms with suckers that attach to the host flukes
flukes that infect the skin schistosomes
small parasite burrows in the superficial layers of the skin, where it lays eggs that hatch in a few days scabies
lives in anal and genital hairs crab louse
Created by: lfrancois