M/I: Parasitology 1 and 2

Question 1

• appreciate the broad range of parasitic organisms and the importance of parasitic diseases
• gain an understanding of life-cycle variations
• recognise the roles played by different classes of host
understand the life-cycles of parasites causing scabies, tick infections, lice infections, amoebiasis, toxoplasmosis and giardiasis.

Answer 1

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Question 2

Parasitology definitions:
Parasite-
Definitive host –
Intermediate host – 
Paratenic host – 
Reservoir host –

Answer 2

A plant or animal that lives on or in another living organism on which it is metabolically dependent
Host in which the parasite reaches sexual maturity
Host in which development occurs but the parasite does not reach sexual maturity
Host in which the parasite enters the body and does not undergo development but remains infective
An animal which can be normally infected with a parasite that also infects people

Question 3

What are the different types of human louse and how are they spread?

Answer 3

Pediculus humanis= body louse, clothing spread (lays eggs in clothing)
Pediculus capitis= head louse, spread by contact (most common, seeing a resurgence)
Phthisrus pubis= public louse, spread by contact
** lice are very host specific

Question 4

What is the lice lifecycle? e.g. P. captious

Answer 4

Egg is laid on hair shaft, the nymph develops , 3 moults to form adult male and female which then reproduce.