Parasitology

Question 1

Define symbiosis

Answer 1

Two different species living together permanently or temporarily

Question 2

A relationship where one symbiont benefits and a second is not affected is:

Answer 2

Commensalism

Question 3

Define parasitosis

Answer 3

Parasite on or within host
Obvious injury/harm (obvious external evidence)

Question 4

T/F: definitive hosts harbor immature, non-reproducing parasites

Answer 4

FALSE

Question 5

What is an “incidental parasite?”

Answer 5

A parasite in a nontypical host

Question 6

What is an “obligatory parasite?”

Answer 6

A parasite that can’t survive outside of a host

Question 7

What is an “aberrant parasite?”

Answer 7

A parasite that is in a strange location

Question 8

What is a “facultative parasite?”

Answer 8

A free living organism that becomes a parasite

Question 9

T/F: infestations of endoparasites includes nematodes, cestodes, trematodes, and protozoans

Answer 9

FALSE
infection

Question 10

Define direct parasitic life cycle

Answer 10

The parasite did not require an intermediate host, only needed a definitive host for development/reproduction

Question 11

What is a “prepatent period?”

Answer 11

The time from the infection with a parasite to the emergence of the reproducing adult

Question 12

What are some types of pathologic consequences of a parasitic infection/infestation?

Answer 12

Trauma
Lesions
Inflammation
Mechanical obstruction
Transmission of other diseases
Irritation

Question 13

Which of the following is a nematode?
A. Echinococcus granulosus
B. Fasciola Hepatica
C. Ancylostoma canium
D. Toxoplasma gondii

Answer 13

C. Ancylostoma canium

Question 14

What type of nematode egg is this?

Answer 14

Ascrid

Question 15

Define monecious

Answer 15

Those that possess both male and female reproductive organs within the same individual

Question 16

What do nematodes lack?

Answer 16

A Gi tract

Question 17

What is the difference between a direct and an indirect lifecycle?

Answer 17

Direct: parasite does not need an intermediate host to get to a definitive host to develop/reproduce
Indirect: Parasite needs one or more intermediate hosts to develop then a definitive host to reproduce

Question 18

T/F: the scolex for eucestodes is always armed with hooks

Answer 18

FALSE

Question 19

Where on a tapeworm would you find gravid proglottids?

Answer 19

The rear end of a tapeworm; the thick proglottid

Question 20

What helminth is always Dioecious?

Answer 20

Nematodes

Question 21

How does a trematode eliminate gastrointestinal waste?

Answer 21

Do not have an anus-
Regurgitates digested food

Question 22

What area two site predilections for trematodes?

Answer 22

Respiratory
Blood Vessels

Question 23

What protozoan class does not have a trophozoite stage?

Answer 23

Apicomplexa

Question 24

What system does aelurostrongylus affect as an adult?

Answer 24

The respiratory tract

Question 25

How does a human become infected with Toxocara canis?

Answer 25

Fecal-oral transmission Ingestion of the eggs

Question 26

How can a cat become infected with Toxocara cati?

Answer 26

Ingestion of infected mice

Question 27

T/F: Ancylostoma tube for me requires a snail as an intermediate host before it infects the feline definitive host

Answer 27

FALSE

Question 28

What is the zoonotic problem that accompanies hook worms?

Answer 28

Creeping eruption

Question 29

What is this?

Answer 29

Trichuris Vulpis

Question 30

Wat dis?

Answer 30

Ancylostoma canium

Question 31

What parasite is depicted?

Answer 31

Echinococcus Granulosus

Question 32

Describe the life cycle of the heartworm

Answer 32

1. Mosquito bites infected dog and ingest mircofilariae from dogs bloodstream 2. Microfilaria develop into infective larva 3. Mosquito takes a blood meal from another dog (definitive host) and transmits infective larva into new dogs bloodstream 4. Larva migrate through dogs tissues (L4-L5) and after prepatent period (6 months), mature into adult heartworms in the heart (Right ventricle) 5. Adult heartworms mate and the female worms release new microfilaria into bloodstream repeating the cycle

Question 33

Where can Eucoleus sp. be found in small animals?

Answer 33

Large airways Nasal cavity/Frontal sinus

Question 34

What should an owner do if they find diplydium canium in their dogs feces?

Answer 34

Inform the owner that their pet has fleas and to treat the patient and their environment for fleas

Question 35

What is salmon poisoning caused by?

Answer 35

Scientific name?- Nanophyetus salmincola (the smallest fluke) RICKETSSIAL agents produce it

Question 36

Which fluke is a result of lizard poisoning?

Answer 36

Platynosomum Fastosum

Question 37

what is swimmers itch?

Answer 37

Shistosomes (during the cercarial stage) that penetrate your skin by wading in shallow waters where ducks/water fowl reside and migrate through your skin

Question 38

Describe the outward signs that may indicate infection of oxyuris equi.

Answer 38

Broken tail hairs Rubbing rear end on fence post Puritis