Lecture 7-Dermacentor Flashcards

(29 cards)

1
Q

Phylum of Dermacentor

A

Arthropoda

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2
Q

Class of Dermacentor

A

Arachnida

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3
Q

Commonly known as ____?

A

ticks

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4
Q

Ecto or endoparasite?

A

ectoparasite

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5
Q

Common hosts (general)

A

mammals, burds and reptiles

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6
Q

4 life stages

A
  • egg
  • larvae
  • nymph
  • adult
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7
Q

Difference between nymph and adult?

A

both have 8 legs but nymphs have undeveloped reproductive system

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8
Q

Separate sexes?

A

yes

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9
Q

Questing behaviour

A

Ticks climb vegetation and when they sense a host, they clump together and try to attach

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10
Q

2 species of ticks studied

A

D. albipiticus and D. andersoni

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11
Q

Common named for D. albipiticus

A

Winter (moose) tick

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12
Q

Common named for D. andersoni

A

Rocky Mountain Wood Tick

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13
Q

How many hosts does D. albipiticus need?

A

1

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14
Q

How many hosts does D. andersoni need?

A

~3 (multiple)

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15
Q

When do engorged females of D. albipitcus lay eggs?

A

March to April (early spring)

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16
Q

Factors affecting transmission of ticks (x5)

A
  • shade
  • temperature
  • onset of winter
  • onset of spring
  • presence of tick predators
17
Q

Host defense response (x2)

A
  • hypersensitivity rxn to salivary antigens

- grooming

18
Q

What causes hypersensitivity rxn. to salivary antigens?

A

basophil response

19
Q

What causes grooming behaviour?

A

systemic eosinophil response (programmed)

20
Q

2 types of grooming behaviour

A

programmed and stimulus

21
Q

Pathology in host (x6)

A
  • feed on blood and tissue fluids
  • local skin irritation
  • secondary infection
  • transmit various pathogens
  • tick paralysis
  • mortality/morbidity
22
Q

What causes babeosiosis?

A

Babesia spp (protozoan parasite)

23
Q

What causes anaplasmosis and ehrlichiosis?

A

Ehrlichia spp. and Anaplasma spp. (bacteria)

24
Q

What causes Lyme disease?

A

Borellia burgdorferi

25
What causes relapsing fever?
Borrelia crocidurae bacteria
26
What causes Rocky mountain spotted fever?
Rickettsia ricketsii bacteria
27
What causes tularemia?
Francisella tularensis bacteria
28
2 treatment options
- chemical acaricides (neurotoxins) | - manual removal
29
3 types of control methods
- pasture spelling - resistant genetic lines of cattle - vaccines (mid gut Ag recombinant)