L19 Review

Question 1

Mechanical vs biologoical vectors

Answer 1

Mechanical vectors – simply functioning as passive vehicles of transmission of etiologic agents
2. Biological vectors – functioning as an active vehicle of transmission of etiologic agents as well as an
environment for development and/ or reproduction of an etiologic agent prior to its infective stage

Question 2

List morphological features that differ between insect and arachnids

Answer 2

• regions
• wings
• anetna

Question 3

Athropods general morphology

Answer 3

Bilateral symmetry
* Jointed limbs (‘arthro’ -joint + ‘pod’-leg)
* Segmented bodies
* A hard, chitinous exoskeleton – the cuticle which provides physical and physiological protection
* A hollow body cavity (coelom), that contains hemolymph
* An open circulatory system and a dorsal, tubular heart
* An alimentary tract, and different feeding habits including:
✓ Hematophagous (blood-sucking) arthropods
✓ Histophagous (tissue-feeding) arthropods
* A central nervous system with two longitudinal nerve tracts
* Separate sexes in adult stages
* A complex life cycle

Question 4

What are two maintain feeding habits of parasitic artopods

Answer 4

• hista: ticks, sucking lice
• hema: dust mites,scabies mites, fleas

Question 5

What are instars

Answer 5

…

Question 6

Difference between complete and incomplete with examples

Answer 6

flies and flease are only complete

Question 7

Dust mites lites where do they live

Answer 7

clothes, under places, carpets, bedding

Question 8

What are two most common dust mites

Answer 8

dust mites and scabies

Question 9

Ways to prevent allergic atacks of mites

Answer 9

vaccum, washing bedding, reduce humidity under 50%, hypoallergenic beddings

Question 10

Most common mites of humans

Answer 10

scabies

Question 11

How do mites infestations occur

Answer 11

• physical contact for scabies
• contact with infested person with gravid female

Question 12

In which ectoparasite does mating occur once, leaving female fertile

Answer 12

scabies

Question 13

Which parasitc athropod borrow under skin

Answer 13

scabies

Question 14

What are sypptoms of scabies

Answer 14

rash on fold, severe itching

Question 15

3 ways infestation can be treated

Answer 15

1. vorroa hygiene techniques
2. brood trapping
3. queen caging
4. brood removal

Question 16

3 ways vorroa mice can be detected

Answer 16

1. sugar jar
2. ethanol jar
3. examine brood
4. sticky scren

Question 17

Difference between male and female

Answer 17

• reproduce vs infected
• colour
• death

Question 18

what do vorroa do to mites

Answer 18

• rip of tegument eat fat secondary infection
• add how
• add effect

Question 19

Most important pest of bees

Answer 19

vorroa mites

Question 20

Importance of humidity in control of mites

Answer 20

reduce humitity, less than 50%

Question 21

What to prevent / control scabies

Answer 21

• avoid contact with infected materal and people
• wash hot cycle and store in bag for more than 3 days

Question 22

How are scabies and crusted scabies treated

Answer 22

• topical cream for scabies
• ivermectin for crusted scabies + topical cream

Question 23

How scabies diafgnosies

Answer 23

appearance can see mites/eggs in burrows

Question 24

What is norweigan scabies

Answer 24

• crusted scabies, no itching in immunocompormised
• sever crusting with many mites