Lec 15: Ectoparasite

Question 1

Most hard ticks submitted to the laboratory belong to the genera ___.

Answer 1

Amblyomma
Dermacentor
Ixodes
Rhipicephalus

Question 2

Amblyomma spp CN

Answer 2

• Lone star
• Gulf Coast Tick

Question 3

Medical importance of Amblyomma spp.

Answer 3

Amblyomma americanum
• tularemia
• granulocytic ehrlichiosis
• monocytic ehrlichiosis

Amblyomma maculatum
• tidewater spotted fever

Question 4

Dermacentor spp. CN

Answer 4

American dog ticks

Question 5

Medical importance of Dermacentor spp.

Answer 5

Dermacentor variabilis
• Rocky mountain spotted fever
• tularemia

Dermacentor andersoni
• Rocky mountain spotted fever
• tularemia
• Colorado fever virus

Question 6

Ixodes spp CN

Answer 6

Black-legged deer ticks

Question 7

Medical importance of Ixodes spp.

Answer 7

Ixodes scapularis & Ixodes pacificus
• Lyme borreliosis
• babesiosis

Question 8

Brown Dog Tick is the CN of what hard tick?

Answer 8

Rhipicephalus sanguineus

Question 9

Medical importance of Rhipicephalus sanguineus

Answer 9

Rocky mountain fever

Question 10

1. CN of Sarcoptes scabiei
2. Medical importance

Answer 10

1. Human itch mite
2. Scabies

Question 11

1. CN of Demodex spp.
2. Medical importance

Answer 11

1. Follicle mite
2. Inhabits sebaceous glands & hair follicles (mostly scalp follicles)

Question 12

1. Dust mite is the CN of ___.
2. Medical importance

Answer 12

1. Dermatophagoides spp.
2. Allergies, asthma

Question 13

How to distinguish Ticks from mites?

Answer 13

Ticks are/have:
• larger
• Haller’s organ (chemosensation)
• Toothed hypostome

Question 14

The species of Lice that parasitize humans

Answer 14

• Pediculus humanus
• Pthirus pubis

Question 15

The difference of Pthirus pubis from Pediculus humanus

Answer 15

Pthirus pubis
• wider
• has abdominal protuberance

Pediculus humanus
• longer

Question 16

Medical importance of Pediculus humanus

Answer 16

Anemia (heavy infestation)

Question 17

Medical importance of Pthirus pubis

Answer 17

• NOT a vector of disease
• High contagious

Question 18

Two main Bed Bug spp that feed on humans

Answer 18

• Cimex lectularius
• Cimex hemipterus

Question 19

1. CN of Ctenocephalides spp.
2. Intermediate host

Answer 19

1. Cat & Dog flea
2. Hymenolepis spp.

Question 20

1. CN of Xenopsylla cheopis
2. Medical importance

Answer 20

1. Oriental Rat Flea
2. Medical importance
   • Black plague (Yersinia pestis)
   • Hymenolepis spp. carrier

Question 21

1. CN of Pulex irritans
2. Medical importance

Answer 21

1. Human Flea
2. Dipylidium caninum & Hymenolepis spp. carriers

Question 22

1. Species under Tunga
2. CN of Tunga spp.
3. Medical importance

Answer 22

1. a. Tunga penetrans
   b. Tunga trimamillata
2. Chigoe fleas
3. Tungiasis

Question 23

1. CN of Dermatobia hominis
2. Clinical presentation

Answer 23

1. Human Bot Fly
2. Furuncular myiasis

Question 24

1. CN of Cochliomyia hominivorax
2. Clinical presentation

Answer 24

1. Primary screwworm fly
2. Obligatory wound myiasis

Question 25

1. CN of Cordylobia anthropophaga 2. Clinical presentation

Answer 25

1. skin maggot fly 2. Obligatory furuncular myiasis

Question 26

1. CN of Lucilla (Phaenicia) spp. 2. Clinical presentation

Answer 26

1. Blow fly 2. Facultative wound myiasis, aural myiasis

Question 27

1. CN of Sarcophaga spp. 2. Clinical presentation

Answer 27

1. Flesh fly 2. **Aural myiasis**, facultative wound myiasis

Question 28

1. CN of Gasterophilus spp. 2. Clinical presentation

Answer 28

1. Horse stomach bot fly 2. Migratory furuncular myiasis

Question 29

1. CN of Oestrus ovis 2. Clinical presentation

Answer 29

1. Sheep Nasal bot fly 2. Opthalmomyiasis

Question 30

1. CN of Cuterebra spp. 2. Clinical presentation

Answer 30

1. Roden and Lagomorph bot fly 2. Furuncular myiasis

Question 31

**Pseudoparasite**: PSYCHODIDAE 1. Species 2. CN 3. Location 4. Feeding

Answer 31

1. Psychoda cinerea 2. **a.** Moth fly **b.** Drain fly 3. Water & organic sludge 4. Organic film, bacteria, fungi, algae

Question 32

**Pseudoparasite**: SYRPHIDAE 1. Species 2. CN 3. Feeding

Answer 32

1. Eristalis tenax 2. **a.** Rat-tailed maggot **b.** Drone fly 3. Decaying organic matter

Question 33

**Pseudoparasite**: STRATIOMYIDAE 1. Species 2. CN

Answer 33

1. Hermetia illucens 2. Soldier fly