Parasitology

Question 1

What are the different symbiosis?

Answer 1

Phoresis
Mutualism
Commensalism
parasitism

Question 2

A symbiote is an organism that live far from each other. True or false?

Answer 2

False, they live in close association with each other.

Question 3

Define symbiosis.

Answer 3

association of two organisms which can not exist independently, “living together”.

Question 4

Is a giardia lamblia a parasite or commensulate?

Answer 4

Both

Question 5

What are the different types of hosts?

Answer 5

Definitive - harbors adult (sexual) stage of a parasite.
Intermediate - tabors larval (asexual) stage of a parasite.
Paratenic - habor a parasite that does not undergo required development; a transfer host
reservoir - an animal (definitive) host that serves to maintain the parasite’s life cycle in nature
incidental - an unusual host, unnecessary for the maintenance of the parasite in nature.

Question 6

What is a vector?

Answer 6

an object or an organism responsible for transmitting a parasite from one host to another.

Question 7

What are the different types of vectors?

Answer 7

Biologic - a vector in which the parasite multiples or develops.
Mechanical - a vector that transmits the parasite unchanged from host to host.

Question 8

True or false, a female anopheles mosquito is a mechanical vector of malaria?

Answer 8

False, it is a biological vector.

Question 9

What are the 3 types of parasites?

Answer 9

Obligate. temporary, and facultative.

Question 10

True or false, a temporary parasite is parasitic for limited periods for either feeding or reproduction?

Answer 10

True

Question 11

What is a facultative parasite?

Answer 11

an organism that is not normally parasitic but can survive for a limited period when accidentally found in another organism.

Question 12

True or false, an obligate parasite is totally physiologically independent of its host?

Answer 12

False, completely dependent.

Question 13

A ectoparasite live on the host and causes infestations, true or false?

Answer 13

True

Question 14

What is an endoparasite?

Answer 14

lives within the host and causes infections.

Question 15

What is an example of ectoparasite seen on dogs and cats?

Answer 15

Flea

Question 16

What is Zoonosis?

Answer 16

any disease of animals that can be transmitted to humans.

Question 17

What is the difference between a protozoa and helminths.

Answer 17

Protozoa - multiply in definitive host
helminths - adult worms do not multiply in definitive host. Worms die over time, unless the host is re-exposed. (severity of disease is proportional to worm load introduced into the host.)

Question 18

What is host specificity?

Answer 18

when a parasite ( particularly helminths) have a specificity for a particular definitive or intermediate host.

Question 19

Why do parasites display host specificity?

Answer 19

Often parasite life cycles can only be completes in a particular host.

Question 20

True or false, the best adapted parasites are the most pathogenic.

Answer 20

False, the least pathogenic are the best adapted.

Question 21

What are the required conditions for endemic parasites?

Answer 21

-Reservoir of infection
-means of transmission to susceptible host
- ability to invade and establish new hosts
-ability to reproduce

Question 22

What are the 3 types of eukaryotic organisms that affect the health and wellbeing of animals?

Answer 22

Protozoa - single cell nucleated
helminths - worm like animals showing differentiation
–nematode - roundworm
– cestode - tapeworm (flat worm)
–trematode - fluke (flatworm)
-arthropods - arachnids and insects