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Flashcards in Metazoa Deck (21):
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3 categories of metazoa

Nematodes ( roundworm)
Trematodes ( flattenworm)
cestodes ( tapeworm)

1

nematodes

roundworms with complete digestive system, including mouth, intestine, and anus
-has eggs and larva

2

Enterobius vermicularis ( pinworm)

nematode
-live in large intestine, glue eggs on skin around anus
-cause itching
-treatment by aerosols or vanguin

3

Dracunculia species ( Guinea worm)

Nematode
-fecal/oral transmission, larvae penetrates intestine
-cause a blister, erupts and worm emerges, sends larvae into water
-treatment is to remove the worm

4

Ascaris lumbricoides

large worms, 30 cm long
live in small intestine of pigs, cows, horses
-eggs in soil very thick ( coat)
-infection by eggs
-when ingested they hatch and goes into trachea and nose and mouth

5

hookworms

-live on blood
-infection by larvae, enter into bare feet, crawls into skin and migrate into lungs
-attach to head by hooks
-only found in warm climates

6

Anisakis

from intestine of fish which are not cleaned thoroughly
-infection by larvae
-Sushi!

7

Trichinella spiralis

ingestion of encysted larvae in undercooked pork, walrus, bear
-in striated muscle fibers such as the heart

8

Fliaria (blood nematodes)

lympathatic ( elephantiasis)-can't drain lymp. fluid
onchocerciasis(river blindness)- worms live in subcutaneous tissue, wolbachia- infection of worms

9

Trematodes

flattenworm
-Schistosoma, host is freshwater snail
-adult worms not affected since it hides under a coat
-eggs reside in various plexus of bladder and intestine

10

S. haematobium

urinary schistosomiasis; inflammation of bladder wall, chronic cancer

11

S. japonicum

intestinal parasite

12

S. mansuni

intestinal parasite, migrates to liver

13

Swimmer's itch

trematode
-non human schistosoma
-caused by a duck schistosome
-can
can't affect circulation and inner, so it cause skin itching only

14

cestodes ( tapeworm)

-intestinal parasites, dependent on host for nutrients, no digestive system
-head has suckers for attachments
-body segment is called proglottids
-acquired by eating inadequately cooked contaminated beef, pork, or fish

15

Hymenolypsis nana

most common tapeworm
-small
-doesn't need an immediate host
-common in tropical area
-infection by ingesting egg
-cause diarrhea cramps

16

2 types of disease

1. intestinal infection- mild clinical picture, produced by pork, beef, fish, or rodent tapeworms
2. deep tissue infection- serious infections, pork tapeworm (cysticercosis), appear as insisted larva in the brain, OR echinocococsis ( dog)

17

Tanenia saginata

beef tapeworm
-life cycle requires both human and cattle
-infectious tissue larvae (cysticerci) ingested by human, mature into tapeworm in intestine
-eggs passed in feces, may be taken up by cattle

18

Diphyllobothrium lactum

fish tapeworm, undercooked contaminated fish
-use vitamin B12 and cause deficiency with anemia
-mild to moderate symptoms: some diarrhea, abdominal pain, eggs are excreted; no feces

19

Taenia solium

pork tapeworm
-intermediate host is pig
- more serious, person to person transmission is possible
2 ways for infection:
- eggs results in hatching of larva in intestine, which then escapes and penetrates body tissues, includes brain
- larvae: results in adult worm in intestine

20

Echinococcus granulosus

dog tapeworm
-never develop into full tapeworm in body
-small, humans are dead-end host
-dogs and coyotes are intended host where worm can grow into adult