BUG Quiz 2 + Midterm Review

Question 1

Identify with Scientific & Common Names

Answer 1

Scientific: Sarcoptes scabiei

Common: Scabies or Mange

Question 2

Identify with Scientific & Common Names

Answer 2

Scientific: Notoedres cati

Common: Mange

Question 3

Identify with Scientific & Common Names

Answer 3

Scientific: Otodectes cynotis

Common: Ear Mite

Question 4

Identify with Scientific & Common Names

Answer 4

Scientific: Psoroptes cuniculi

Common: Ear Canker

Question 5

Identify with Scientific & Common Names

Answer 5

Scientific: Demodex spp

Common: Demodectic Mange

Question 6

Identify with Scientific & Common Names

Answer 6

Scientific: Demodex spp

Common: Demodectic Mange

Question 7

Identify with Scientific & Common Names

Answer 7

Scentific: Cheyletiella spp

Common: Walking Dandruff

Question 8

Identify with Scientific & Common Names

Answer 8

Scientific: Cheyletiella
Common: Walking Dandruff

Question 9

Identify with Scientific & Common Names

Answer 9

Scientific: Anoplura Louse

Common: Sucking Louse

Question 10

Identify with Scientific and Common Names

Answer 10

Scientific: Mallophaga

Common: Biting Louse

Question 11

Identify with Scientific and Common Names

Answer 11

Scientific: Ctenocephalides felis

Common: Common Flea

Question 12

Identify with Scientific and Common Names

Answer 12

Scientific: Ixodid Tick

Common: Hard Tick

Question 13

Identify with Scientific and Common Names

Answer 13

Scientific: Ixodid Tick

Common: Hard Tick

Question 14

Identify with Scientific and Common Names

Answer 14

Scientific: Argasid Tick

Common: Soft Tick

Question 15

Identify with Scientific and Common Names

Answer 15

Scientific: Argasid Tick

Common: Soft Tick

Question 16

Identify

Answer 16

Maggot

Question 17

Identify. What life stage is this? How do you know?

Answer 17

Cuterebra

The life stage is L2 because it is not dark enough to be L3

Question 18

Identify. What Life stage is this? How do you know?

Answer 18

Cuterebra

Life stage L3 because only at this stage does the larvae become covered in black dorsal spines

Question 19

Describe the difference in appearance between Isospora spp and Toxascaris leonina

Answer 19

• T. leonina is around 90um while Isospora spp are 20-40 um
• T. leonina has a rough, very striated shell while Isospora spp is more smooth
• Isospora is either egg-shaped or looks identical to Toxocara canis except colourless

Question 20

Describe the differences between Paragonimus kellicotti, Alaria spp and a typical mite egg

Answer 20

• P. kellicotti is usually smaller than Alaria spp (75-118 um vs 98-134 um)
• P. kellicotti has distinguishing “shoulders” The shell is also very contrasting compared to its cytoplasm
• A typical mite egg more resembles Ancylostoma eggs with a folded up mite inside
• Alaria spp has distinct swirls & circles inside the egg. It is a lighter yellow colour while P. kellicotti is a darker golden brown

Question 21

What are 4 major differences to distinguish between Dirofilaria immitis and Dipetalonema

Answer 21

1. Dirofilaria immitis has a tapered head and Dipetalonema has a straight head
2. DIrofilaria immitis is larger 284-340 um vs Dipetalonema’s 258-292 um
3. When fixed in Formalin, Dirofilaria has a straight tail and Dipetalonema has a curved tail
4. Dipetalonema has a Cephalic hook on the end

Question 22

What are 2 major ways to distinguish between the adult stages of Taenia spp and Diphyllobothrium latum

Answer 22

1. Diphyllobothrium latum has Bothria on the Scolex instead of the Acetabula seen on Taenia spp
2. Diphyllobothrium latum has a small brown dot in the centre of each Proglottid which is the uterus of each segment

Question 23

What happens if we, as humans, ingest the eggs of Echinococcus spp? What happens if we ingest the intermediate host?

Answer 23

If we ingest the eggs, we become the intermediate host and the Hyatid Cysts begin to grow and death can occur

If we ingest the intermediate host, we become a dead-end host and nothing will likely occur

Question 24

Explain the step-by-step Elimination process involved in Identifying Mites

Answer 24

1. What category does it fall under? Sarcoptid (short back legs, round body) or Psoroptid (long back legs, pear shaped body) Use this to narrow it down to 2 choices (There is 2 species in each Category)
2. Which distinguishing factor does it have? (Dorsal spines, suckers, pedicels) Use these to decide which of the 2 species you are looking at

Question 25

Which Mite can be described as having dorsal spines?

Answer 25

Sarcoptes scabiei

Question 26

Which is the largest of the Mites?

Answer 26

Psoroptes cuniculi

Question 27

Which Mite can be described as having martini-glass shaped suckers?

Answer 27

Psoropted cuniculi

Question 28

Which mite is commonly known as the Ear Mite?

Answer 28

Otodectes cynotis

Question 29

Which Mite can be described as having a massive head and claws on the mouth?

Answer 29

Cheyletiella spp

Question 30

Name 2 solutions you can use to perform a Fecal Floatation and how long the wait time is for each

Answer 30

1. Sodium Nitrate: 10 minutes
2. Sugar solution: 15-20 minutes

Question 31

What are 2 tests used to isolate and examine Microfilariae, usually of Dipetalonema and Dirofilaria?

Answer 31

1. Modified Knott’s Technique
2. Filter Test

Question 32

List the steps involved in setting up a Microscope for a fecal sample. (There are 5 things to note)

Answer 32

1. Condenser down
2. Diaphragm closed
3. Light all the way up
4. Scan and Measure on 10x
5. Details on 40x