LAB FINAL PARASITIC HELMINTHS AND ECTOPARASITES

Question 1

Scolex:

Answer 1

Head of tapeworm

Question 2

Definitive host:

Answer 2

Host that defines it/houses adult worm

Question 3

2 tapeworms/cestodes:

Answer 3

Taenia solium

Taenia saginata

Question 4

4 flukes/trematods:

Answer 4

1. Clonorchis sinensis
2. Fasciolopsis buski/ hepatica
3. Schistosoma
4. Swimmer’s itch

Question 5

6 roundworms/nematodes:

Answer 5

1. Enterobius
2. Ascaris/ Anisakis
3. Visceral larval
4. Necator
5. Cutaneous larval
6. Trichinella

Question 6

Segmented round worm:

Answer 6

Leech

Question 7

5 arthropods:

Answer 7

1. Ticks
2. Fleas
3. Pediculous humans corporus
4. Sarcoptes scabiei
5. Phthirus pubis

Question 8

Clonorchis: (3)

Answer 8

• Chinese liver fluke
• Ingested by snail (IH)
• Penetrates fish

Question 9

Fasciolopsis:

Answer 9

• Intestinal fluke

- IH: snails, water plants

Question 10

Schistosoma:

Answer 10

• Blood fluke

- Lives in blood stream

Question 11

Swimmer’s itch:

Answer 11

• Migratory birds defecate into fresh water lakes, where the snail becomes infected-> infects human skin
• IH: snail

Question 12

Enterobius:

Answer 12

• Pin/round worm

- Common in humans

Question 13

Visceral larval migrans:

Answer 13

• Roundworm

- Effects humans that harbor dog larvae

Question 14

Necator americanus:

Answer 14

American hookworm

Question 15

Cutaneous larval migrans:

Answer 15

• Hookworm for dogs and cats only

- Humans are accidental hosts-> gets trapped under skin and tries to crawl out

Question 16

Trichinella spiralis:

Answer 16

• Roundworms
• Poorly cooked pork
• female/male mate

Question 17

Leeches

Answer 17

Used as medicinal agent for centuries

Question 18

Hard ticks cause:

Answer 18

1. Amblyomma
2. Ixodes/Lyme disease
3. Dermacenter/ Ehrlichiosis

Question 19

Soft ticks cause:

Answer 19

Ornithidoros

Question 20

Humans are _______ hosts to ticks.

Answer 20

Accidental

Question 21

2 of the most prevalent disease transmitted by the bite of a flea is:

Answer 21

1. bubonic plague

2. endemic typhus

Question 22

Pedicularis humans corporis:

Answer 22

• Head and body lice

- Human host only

Question 23

2 of the most prevalent disease transmitted by body lice:

Answer 23

1. Epidemic typhus

2. Relapsing fever

Question 24

Sarcoptes scabiei:

Answer 24

Human itch mite that burrows into the skin

Question 25

How does scabies infect humans?

Answer 25

1. sexual contact
2. trying on clothes
3. breaks through soft skin

Question 26

Proglottid:

Answer 26

Segment of a tapeworm containing both male and female reproductive organs

Question 27

Arthopod:

Answer 27

Joint-legged

Question 28

Vector:

Answer 28

Organism that does not cause disease but spreads infection by transferring pathogens from one host to another

Question 29

Mechanical vector:

Answer 29

Picks up infectious agents on the outside of their bodies and transmits them through physical contact without being infected
Ex: Flies, cockroaches

Question 30

Biological vector:

Answer 30

Carries pathogens that multiply within their bodies and are delivered to new hosts
Ex: Mosquitos, ticks

Question 31

Toxoplasma gondii:

Answer 31

• Toxoplasmosis

- Single cell organism (no male or female)

Question 32

Plasmodium:

Answer 32

• Malaria

- Causes recurrent fever when RBC pop and release parasites

Question 33

Taenia solium: (3)

Answer 33

• Causes Teaniasis disease
• Pork tapeworm
• Leading cause of epilepsy and cysticercosis (cysts in brain)

Question 34

Taenia saginata:

Answer 34

Causes Taeniasis Disease
Beef tapeworm
IH: cattle

Question 35

Ascaris:

Answer 35

• Human roundworm
• Largest nematode
• Most common human helminthic infection

Question 36

Diphylobrothriasis:

Answer 36

• Broad fish tapeworm

- Cestodes have a scolex instead of suckers

Question 37

Anisakis:

Answer 37

• Anisakiasis Disease

- Ingestion of larvae of nematodes (roundworms)