L 68 Ectoparasites Flashcards Preview

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Flashcards in L 68 Ectoparasites Deck (22):
1

Ticks are second to _____ in transmitting disease to humans

Mosquitos

2

Ticks are ______ feeders

Ticks are slow feeders and do not transmit disease quickly

3

What is the scutum and hypostome on the tick?

Scutum is the shield-like back

Hypostome is just above move, used for attachment

4

How to remove a tick

Grasp the tick with forceps near the head and gentle pull
Don't squeeze the body!

5

Tick disease prevention

Wear long sleeves and pants
Check often for ticks and use deet

6

What are the ticks that cause Lyme Disease?

Ixodes
Amblyomma americanum

7

Which ticks cause babesiosis?

Ixodes
Rhipicephalus sanguineus

8

Which ticks can cause paralysis?

Dermacentor
Amblyomma americanum

9

Which ticks cause Rocky Mountain Spotted Fever?

Dermacentor
Amblyomma americanum
Rhipicephalus sanguineus

10

Which tick is the Lone Star Tick?

Amblyomma americanum

11

What is tick toxicosis?

Tick paralysis
Usually after days of tick feeding
Female saliva causes sonduction block
Fatalities from respiratory paralysis possible
Removing tick leads to resolution within hours

12

Pyemotes dermatitis

Type of mite
Straw and grain itch
May provoke allergic response

13

Demodex folliculorum

Mite
Causes Demodiciosis
Causes Demodex dermatitis
Looks like acne
Involves follicle, is pruritic
Remember the vermiform shape of the mite

14

Eutrombicula

Mite causing chigger dermatitis
Larval mite with long hypostome like a sword
Usually attacks animals–red lesions on animals
In humans produces pruritis but does not burrow
Mite is gone, but leaves hypostome in skin causing itch
Just treat the itch

15

Scabies

Mite
Sarcoptes scabiei
A burrowing mite–female only, lays eggs
Causes pruritic eruptions
Can be an STD
Dog version short lived
Human type from crowded conditions

16

Norwegian Scabies

Crusted lesions teeming with mites
Head, neck, buttock, perianal
Assoc with HIV

17

Scabies diagnosis

Apply mineral oil to skin, scrape lesion and visualize microscopically
Whole or mite parts visualized

18

Scabies treatment

Permethrin
Ivermectin–anti-helminthic
Pruritis might continue

19

Lice species on head, body, pubic

Phthirus: pubic
Pediculus: head and body

20

Are lice a big deal?

Not really

21

Crabs?

Phthirus pubis or pubic lice
Nits (eggs) cemented to hair follicles, adults feed in pubic area
Transmitted by sexual contact

22

Pediculus humanus

Pediculosis is a type of lice that infects the head and body
Only the body louse is vector for epidemic typhus
Treated with permethrin
Transmitted in crowded conditions–don't share clothes, combs