Lecture 7-Dermacentor Flashcards
(29 cards)
Phylum of Dermacentor
Arthropoda
Class of Dermacentor
Arachnida
Commonly known as ____?
ticks
Ecto or endoparasite?
ectoparasite
Common hosts (general)
mammals, burds and reptiles
4 life stages
- egg
- larvae
- nymph
- adult
Difference between nymph and adult?
both have 8 legs but nymphs have undeveloped reproductive system
Separate sexes?
yes
Questing behaviour
Ticks climb vegetation and when they sense a host, they clump together and try to attach
2 species of ticks studied
D. albipiticus and D. andersoni
Common named for D. albipiticus
Winter (moose) tick
Common named for D. andersoni
Rocky Mountain Wood Tick
How many hosts does D. albipiticus need?
1
How many hosts does D. andersoni need?
~3 (multiple)
When do engorged females of D. albipitcus lay eggs?
March to April (early spring)
Factors affecting transmission of ticks (x5)
- shade
- temperature
- onset of winter
- onset of spring
- presence of tick predators
Host defense response (x2)
- hypersensitivity rxn to salivary antigens
- grooming
What causes hypersensitivity rxn. to salivary antigens?
basophil response
What causes grooming behaviour?
systemic eosinophil response (programmed)
2 types of grooming behaviour
programmed and stimulus
Pathology in host (x6)
- feed on blood and tissue fluids
- local skin irritation
- secondary infection
- transmit various pathogens
- tick paralysis
- mortality/morbidity
What causes babeosiosis?
Babesia spp (protozoan parasite)
What causes anaplasmosis and ehrlichiosis?
Ehrlichia spp. and Anaplasma spp. (bacteria)
What causes Lyme disease?
Borellia burgdorferi