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Flashcards in Nematodes Deck (28):
1

What are the intestinal Nematodes?

1) enterobius vermicularis (pinworm) 2) Ascaris lumbricoides (giant roundworm) 3) Strongyloides stercoralis 4) Ancylostoma duodenale, Necator americanus (hookworms)

2

Enterobius vermicularis

pinworm. Fecal oral. Intestinal infection causing anal pruritus (diagnosed via scotch tape test). TX: Bendazoles or pyrantel pamoate because worms are bendy

3

Ascaris lumbricoides (giant round worm)

fecal-oral; eggs visible in feces under microscope. Intestinal infection. TX: Bendazoles or pyrantel pamoate

4

Strongyloides Stercoralis

larvae in soil penetrate the skin. Intestinal infection causing vomiting, diarrhea, epigastric pain (may be peptic ulcer-like). TX: bendazoles or pyrantel pamoate

5

What are the tissue nematodes?

onchocerca volvulus, (f)LOA (f)LOA, Wuchereria bancrofti, Toxocara canis

6

Onchocerca vulvulus

female blackfly bite. hyperigmented skin and river blindness (black flies, black skin nodules, 'black sight'; allergic reaction to microfilaria possible. TX: Ivermectin (ivermectin for rIVER blindness)

7

(f)LOA (f)LOA

deer fly, horse fly, mango fly. Swelling in skin, worm in conjunctiva. TX: diethylcarbamazine

8

Wuchereria bancrofti

female mosquito. blocks lymphatic vessels: elephantiasis; takes 9 mo to one year after bite to become symptomatic. TX: Diethyl carbamazine.

9

Toxocara canis

fecal-oral. Visceral larva migrans. Albendazole or mebendazole. Can get into eye

10

Nematodes routes of infection EAT

ingested: Enterobius, Ascaris, Toxocara

11

Nematodes routes of infection (these get into your feet from the SANd)

stronglyoides, Ancylostoma, Necator

12

Nematodes from bites (lay LOW to avoid getting bitten)

(f)loa (floa), Onchocerca volvulus, Wuchereria bancrofti

13

What are the Cestodes (tapeworms)

Taenia solium, diphyllobothrium latum, Echinococcus granulosus

14

Taenia Solium modes of transmission

1) Ingestion of larvae encysted in undercooked pork 2) Ingestion of eggs

15

Taenia solium

1) ingestion of larvae encysted in undercooked pork leads to intestinal infection and should be treated with praziquantel. 2) ingestion of eggs cause cysticercosis, neurocysticercosis and should be treated with praziquantel. Albendazole for neurocysticercosis

16

Diphyllobothrium latum

ingestion of larvae from raw reshwater fish. Vit B12 deficiency (tapeworm competes for B12 in intestine) which leads to anemia. TX: praziquantel

17

Echinococcus granulosus

ingestion of eggs from dog feces. Hydatid cysts in liver, causing anaphylaxis if antigens released (surgeons pre-inject with ethanol to kills cysts before removal). TX: Albendazole

18

What are the Trematodes (flukes)

schistosoma, Clonorchis Sinensis

19

Schistosoma

snails are host; cercariae penetrate skin of humans. Liver and spleen granulomas, fibrosis, and inflammation. Chronic infection with S. haematobium can lead to SCC of the bladder (painless hematuria). TX: praziquantel

20

Clonorchis sinesnsis

undercooked fish. Biliary tract inflammation -> pigmented gallstones associted with cholangiocarcinoma. TX: praziquantel

21

biliary tract disease, cholangiocarcinoma

clonorchis sinensis

22

Brain cysts, seizures

taenia solium (cysticercosis)

23

hematuria, bladder cancer

schistosoma hamatobium

24

liver *hydatid cysts)

echinococcus granulosus

25

Microcytis anemia

ancylostoma, necator

26

perianal pruitus

enterobius

27

portal HTN

schistosoma mansoni, schistosoma japonisum

28

vit b12 deficeincy

diphyllobothrium latum