Lecture 10

Question 1

Taxa invading live tissue

Answer 1

• Calliphoridae (blowflies)
• Oestridae (botflies)
• Sarcophagidae (flesh flies)

Question 2

Calliphoridae

Answer 2

Blowflies

Question 3

Oestridae

Answer 3

Botflies

Question 4

Sarcophagidae

Answer 4

Flesh flies

Question 5

What is myiasis?

Answer 5

invasion of live tissues by fly larvae characterized by its site of invasion

Question 6

5 sites of myiasis invasion

Answer 6

• gastrointestinal
• urogenital
• ocular
• nasopharyngeal
• cutaneous

Question 7

Facultative vs Obligatory Myiasis

Answer 7

Facultative: larvae capable of living in both living and decaying tissue

Obligatory: larvae dependent on living tissue

Question 8

example of facultative myiasis

Answer 8

1. Ingestion of fly eggs
2. cutaneous myiasis: blowfly and fleshfly maggots develop in sores

Question 9

What is maggot therapy?

Answer 9

controlled therapeutic use of sterile fly maggots that feed on necrotic tissue

Question 10

what species is involved in obligatory myiasis

Answer 10

oestridae (botflies)
Calliphoridae (New World Screwworm)

Question 11

How does obligatory myiasis occur?

Answer 11

eggs are laid on carrier
hatch when carrier feeds on host
enters skin and forms small boils that grow (furuncular myiasis)

Question 12

how are new world screwworms involved in myiasis

Answer 12

• pregnant females attracted to fresh wounds to lay eggs
• larvae feed on healthy tissue

Question 13

What is the technique to reduce New World screwworms?

Answer 13

release of sterile males

Question 14

Treatments of Myiasis

Answer 14

• Varies according to : location and severity
• Manual/surgical removal
• removal of entire damaged tissue
• antibiotics to prevent secondary infection
• Chemotherapy: ivermectin
• purgatives: for intestinal cases

Question 15

Prevention of Myiasis

Answer 15

• insect repellents
• hygiene, where tissue damage
• close monitoring
• clothes and underwear
• prophylactic use of ivermectin in livestock