L 68 Ectoparasites

Question 1

Ticks are second to _____ in transmitting disease to humans

Answer 1

Mosquitos

Question 2

Ticks are ______ feeders

Answer 2

Ticks are slow feeders and do not transmit disease quickly

Question 3

What is the scutum and hypostome on the tick?

Answer 3

Scutum is the shield-like back

Hypostome is just above move, used for attachment

Question 4

How to remove a tick

Answer 4

Grasp the tick with forceps near the head and gentle pull

Don’t squeeze the body!

Question 5

Tick disease prevention

Answer 5

Wear long sleeves and pants

Check often for ticks and use deet

Question 6

What are the ticks that cause Lyme Disease?

Answer 6

Ixodes

Amblyomma americanum

Question 7

Which ticks cause babesiosis?

Answer 7

Ixodes

Rhipicephalus sanguineus

Question 8

Which ticks can cause paralysis?

Answer 8

Dermacentor

Amblyomma americanum

Question 9

Which ticks cause Rocky Mountain Spotted Fever?

Answer 9

Dermacentor
Amblyomma americanum
Rhipicephalus sanguineus

Question 10

Which tick is the Lone Star Tick?

Answer 10

Amblyomma americanum

Question 11

What is tick toxicosis?

Answer 11

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

Question 12

Pyemotes dermatitis

Answer 12

Type of mite
Straw and grain itch
May provoke allergic response

Question 13

Demodex folliculorum

Answer 13

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

Question 14

Eutrombicula

Answer 14

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

Question 15

Scabies

Answer 15

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

Question 16

Norwegian Scabies

Answer 16

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

Question 17

Scabies diagnosis

Answer 17

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

Question 18

Scabies treatment

Answer 18

Permethrin
Ivermectin–anti-helminthic
Pruritis might continue

Question 19

Lice species on head, body, pubic

Answer 19

Phthirus: pubic
Pediculus: head and body

Question 20

Are lice a big deal?

Answer 20

Not really

Question 21

Crabs?

Answer 21

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

Question 22

Pediculus humanus

Answer 22

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