INSECTS: Diptera - Tabanidae, Hippoboscidae, Culicidae, and Oestridae spp. Flashcards
What characteristics are associated with Oestreidae spp.?
- Large, hairy, and short-lived
- Non-functional mouthparts
- Obligatory, host specific, parasitic larvae
What is the common name for Cuterebra spp.?
Rodent or Rabbit bot fly, or New World skin bot fly
Who are the hosts for Cuterebra spp.?
Rodents, rabbits, squirrels, chipmunks, mice, dogs, and cats
Are Cuterebra spp. zoonotic?
Yes
Cuterebra spp. can be identified based on -?
Their thrid instar, or larvae, and the season
What is present on the third instar of Cuterebra spp.?
Black spines
True or False: Veterinary practicioners will occasionally remove young Cuterebra larvae from animals, and because of their small size and white color, they can be misidentified.
True
Where will Cuterebra be found in the host?
In SQ CT’s, in the oral and nasal regions (where instars can potentialy migrate to the brain)
What pathogenesis is associated with Cuterebra infestations?
Fibrotic cysts forming around the instar in SQ tissues, and in cats instars can migrate to the brain leading to an infarction
What clinical signs are associated with Cuterebra infestations?
Lumps in neck, fur constantly wet, Type 1 hypersensitivty, and holes dripping fluids from cysts
What is the common name for Hypoderma spp.?
Warble fly, Heel fly, Ox warble
What is the common name for Hypoderma larvae or instars?
Cattle grub
You identify multiple eggs laid in lines on the distal thoracic limb, and instars in the submucosa of the esophagus. What species of Hypoderma do you suspect?
H. lineatum
You identify eggs laid singly in the epidural fat along the spinal cord. Whay Hypoderma spp. do you suspect?
H. bovis
Where can third instars be found in cattle?
Found in lumps or warbles, on the backs of cattle in spring
When are H. lineatum and H. bovis active?
- H. lineatum* = Early summer
- H. bovis* = Late summer
\While Hypoderma infestations can lead to skin damage and carcass downgrade, what can infestations of H. lineatum and H. bovis lead to prior to death?
H. lineatum can lead to bloat (then death), and H. bovis can lead to toxin production and paraplegia
Timing and what medication can be utilized for treament of Hypoderma spp.?
MCL’s
What is the common name of Oestrus ovis?
Sheep nasal bot
Warble fly of sheep
Who are the common hosts of O. ovis?
Sheep, goats, llamas, and people
True or False: Sheep nasal bots lack mouth parts.
True
Describe the life cycle of O. ovis?
- 1st instars are deposited in host nostrils
- Overwinter stage
- Developing instars feed on mucus
- Migrate to frontal sinsuses developing into 2nd and 3rd instars
- Sneezed out, and pupate to become adults in environment
What pathogenesis is associated with O. ovis?
- Malaise
- Loss of weight
- Irritation and inflammation due to instar hooks and spines
- Snotty nose, increased nasal discharge
- Secondary bacterial infections
Abherrant instar migration can lead to them entering the -?
Brain cavity
When can MCL’s be administered for treatment of Hypoderma infestations?
Late summer or early fall, and then again midwinter
