Lecture One

Question 1

What is symbiosis and name the three main types of it: (for each state whether or not they are normally obligatory )

Answer 1

Refers to the close relationship between two different organisms:
Commensalism- one partner benefits other remains unharmed (normally not obligatory)
Mutualism- both partners benefit (often but not always obligatory)
Parasitism- the parasite benefits and the host is harmed (obligatory for the parasite but not for the host)

Question 2

What is the difference between an endo and and ecto parasite?

Answer 2

ecto- infest the host

endo- infects the host

Question 3

What is the difference between an obligatory and faculative?

Answer 3

Obligatory- host required

Facultative- host is not required

Question 4

What is the definitive host?

Answer 4

The host in which sexual maturity is obtained

Question 5

What is an intermediate host?

Answer 5

additional obligatory host in the parasites life cycle

Question 6

What is a paratenic host

Answer 6

additional non-obligatory host within the life cycle

Question 7

What is a vector?

Answer 7

arthropod carrier of infective stage from one host to another

Question 8

What is a reservoir host?

Answer 8

alternative host, does not suffer clinical disease but can act as a carrier

Question 9

What is an accidental host?

Answer 9

one that does not normally harbour the parasite and one that it is unable to complete its life cycle within