Ticks and Tick-borne Disease Flashcards Preview

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Flashcards in Ticks and Tick-borne Disease Deck (48)
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1

What are the features of ticks and how do they differ from insects?

Ticks are arachnids, NOT insects. Cephalothorax and abdomen, or completely fused body. 8 legs. NO antennae, and NO wings.

2

What are some features of soft ticks (Argasidae)?

Mouth parts cannot be seen from dorsal view. NO scutum. Take multiple, small blood meals. Lay multiple batches of eggs.

3

What are some features of hard ticks (Ixodidae)?

Mouth parts are visible from dorsal view. Have scutum, but females only have partial scutum. Feed for approx. 1 week, lay ONE large batch of eggs (>20000). Sexual dimorphism.

4

Palp

Appendage found on the mouth (capitulum) of invertebrates. DOES NOT go into the skin when tick feeds.

5

Hypostome

Serrated edges on the mouthparts (capitulum), which help anchor the tick into the skin.

6

How many legs do tick larval stages have?

6

7

How many legs do tick nymphs have?

8

8

How many nymphal stages do soft and hard ticks have?

Soft ticks: 2 or more
Hard ticks: Only 1

9

Argas

Soft tick sp.
Feeds on birds and bats.
Morphology: Flat body and suture line!

10

Ornithodoros

Soft tick sp.
Feeds on mammals.
Round body, NO suture line. Long, well-developed mouth parts.

11

Otobius megnini

Soft tick sp.
Feeds on cattle and horses.
Nymphal tegument is spiny. Short mouth parts (NO adult feeding).

12

Ixodes

Black-legged tick.
White-tailed deer and livestock, plus other animals.
Eastern USA
Anal groove in FRONT of anus.

13

Amblyomma americanum

Lone Star Tick
SE USA
Wide host range.
Anal groove behind anus

14

Amblyomma maculatum

Gulf Coast Tick
SE USA
Cattle
Anal groove behind anus

15

Dermacentor variabilis

American Dog Tick
NOT out west.
Canine
Capitulum base does NOT laterally protrude.
7 caudal festoons.

16

Dermacentor andersoni

Rocky Mountain Dog Tick
Everywhere that D. variabilis is NOT located.
Deer, cattle, and sheep.
Morphology same as D. variabilis.

17

Rhipicephalus sanguineus

Brown Dog Tick
Does NOT tolerate cold weather.
Base capitulum protrudes laterally. Festoons present and anal groove.

18

Rhipicephalus (Boophilus) annulatus

Cattle Tick
Eradicated from USA.
Cattle
Same capitulum as R. sanguineus, NO festoons.
REPORTABLE DISEASES!!!

19

Rhipicephalus (Boophilus) microplus

Southern Cattle Fever Tick
Eradicated from USA
Wider host range than R. annulatus.
Same as other Boophilus.
REPORTABLE!!

20

Haemophysalis

Rabbit Tick
WIdely distributed.
Rabbits
Second segment of palp wider than capitulum base.

21

Tick poisoning/toxicosis

Argas soft ticks.
Dermacentor and Amblyomma
Acute ascending flaccid paralysis caused by toxin in tick saliva.

22

Powassan encephalitis transmitted by:

Ixodes spp.

23

Nairobi Sheep Disease transmitted by:

Various hard tick spp. REPORTABLE!!!
Causes hemorrhagic gastroenteritis.

24

African Swine Fever transmitted by:

Ornithodoros soft tick.
REPORTABLE!!! Systemic hemorrhagic disease.

25

Lyme Disease transmitted by:

Ixodes scapularis --> Eastern US
Ixodes pacificus --> Western US
Causative agent: Borrelia burgdorferi

26

Tularemia transmitted by:

Dermacentor and Amblyomma americanum.
Agent: Francisella tularensis
Mid-west disease.

27

Heartwater transmitted by:

Amblyomma
Reportable!!!!
Agent: Ehrlichia ruminantium

28

Canine granulocytic ehrlichiosis transmitted by:

Amblyomma
Agent: Ehrlichia ewingii

29

Tropical Canine Pancytopenia transmitted by:

Rhipicephalus sanguineus
Ehrlichia canis

30

Canine cyclic thrombocytopenia transmitted by:

Rhipicephalus sanguineus
Anaplasma platys