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Parasit Exam 3 > Insects 2 > Flashcards

Insects 2 Flashcards

1
Q

Tabanus

  • Common name
  • hosts
A
  • horse fly

- large domestic or wild animals, humans, small mammals, birds

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2
Q

Tabanus

-Identification

A
  • stout bodied fly

- mouthparts slashing and sponging

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3
Q

Tabanus

  • Pathogenesis and lesions
  • CS
A
  • painful bites
  • efficient mechanical vectors of several dz
  • annoyance
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4
Q

Chrysops

-Common name

A

deer fly

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5
Q

Chrysops

-Identification

A
  • dark bands across wings
  • antennae elongate
  • Bite horses in shaded areas
  • horses will stand in the sun to avoid
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6
Q

Tabanids

  • Dx
  • Tx and prevention
A
  • identify fly
  • Chrysops prefer shade
  • Control in housing and on animals (repellents, insecticides)
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7
Q

Melophagus ovinus

  • Host
  • Identification
  • site of infection
A
  • sheep
  • flattened, hairy wingless dipteran
  • blood sucking mouthparts
  • wool
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8
Q

Melophagus ovinus

-LC

A
  • Female produces one egg which hatches inside her body
  • Third instar adheres to fleece. Immobile instars pupate and visible on fleece
  • adults emerge in 3 weeks in summer, longer in winter
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9
Q

Myiasis

  • Facultative
  • Obligatory
A
  • infestation of living animals w/ larvae of dipteran flies
  • optional
  • can not survive w/o host
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10
Q

Cutaneous myiasis

A

“fly strike”

  • maggots causing fly strike belong to Calliphoridae or Sarcophagidae Family
  • Calliphoridae, the blow flies, screwworm
  • sarcophagidae are the flesh flies
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11
Q

Family Oestridae

  • Adults
  • Larvae
A
  • long hairy flies, non functional mouthparts, short-lived

- obligatory parasites, host specific

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12
Q

Cuterebra

  • Common name
  • hosts
A
  • rodent or rabbit bot fly

- rodents, rabbits, zoonotic

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13
Q

Cuterebra

-identification

A

third stage instar and season

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14
Q

Cuterebra

-sites of infestation

A

subcutaneous connective tissue, can locate in nasal and oral regions and migrate to the brain

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15
Q

Cuterebra

-Pathogenesis and lesions

A

fibrotic cyst forms from instar in subcutaneous tissue. Instar in brain of cat can lead to infarction

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16
Q

Cuterebra

-CS

A

-lump in neck, fur constantly wet, hole drips fluid

17
Q

Cuterebra

-Dx

A
  • Instar can be removed whole
  • Type 1 hypersensitivity type rxn
  • Wound heal slowly
18
Q

Cuterebra

-Tx and prevention

A

-several remedies may protect, but are not approved

19
Q

Hypoderma

  • Common name-adults:
  • Common name-instar:
  • Hosts
  • identification
A
  • warble fly, heel fly, ox warble
  • cattle grub
  • cattle
  • typical oestrid
20
Q

Hypoderma
LC
-H. lineatum
-H. bovis

A
  • overwinter as 1st instar
  • lineatum; accumulate in submucosa of esophagus. Laid in lines of 6 or more on lower limb, active begining of summer.
  • bovis; accumulate in epidural fat of spinal cord, eggs laid singly, active later
21
Q

Hypoderma

-site of infestation

A

3rd stage instars found in lumps (warbles) on backs of cattle in spring

22
Q

Hypoderma

-pathogenesis and lesions

A
  • 3rd stage larvae under skin causes damage and downgrade carcass; ECONOMIC LOSS
  • lineatum death-> bloat
  • bovis toxins -> paraplegia
23
Q

Hypoderma
CS
Dx
Tx

A
  • faulty regurgitation, bloat, paraplegia
  • identification of parasite
  • MCLs kill early stages, timing
24
Q

Oestrus ovis

  • common name
  • host
A

sheep nasal bot, warble fly of sheep

-sheep, goats, llamas, humans

25
Q

Oestrus ovis

-identification

A

nasal bots 3 cm long, yellowish-white

26
Q

Oestrus ovis

LC

A
  • female deposits 1st stage instars into nostril of sheep during flight
  • overwinter stage (2w-9m)
  • developing bots feed on mucus, cause irritation
  • in frontal sinuses develop to 2nd and 3rd stage instars
  • reach 3rd instar stage (3w-months) before sneezed out to pupate (4-7w)
  • Adults emerge, females survive 2w, depositing 500 instars
27
Q

Oestrus ovis

  • pathogenesis and lesions
  • CS
A
  • instars irritate w/ hooks and spines and excessive secretion
  • bacterial infection common
  • to avoid attacks animals expend much energy and lose condition and weight
  • Aberrant migration through soft pallet may enter brain cavity
  • humans can become infected in the eye or lip, but does not develop further
28
Q

Oestrus ovis

  • Dx
  • Tx & prevention
A
  • fly identification

- MCLs at beginning of summer and again midwinter

29
Q

Gasterophilus

  • common name
  • host
  • G. intestinalis
  • G. nasalis
A
  • Bot fly larvae, bot fly
  • Horse
  • differentiate based on color and spines
30
Q

Gasterophiluis

-LC

A
  • Egg hatches to 1st stage instar
  • G. intestinalis: hatches when licked; attached to tongue/lips
  • G. nasalis: hatches spontaneously; crawls into mouth
  • In oral cavity 1st to 2nd stage instar
  • Swallowed; develop 3rd stage instar (site specific); live up to 12 m
  • spring pass in feces, pupate
  • 3-9 wk adult fly
31
Q

Gasterophiluis intestinalis

A
  • eggs on forelegs and shoulder
  • 3rd stage instars in non-glandular part of stomach and cardiac region
  • red in fresh feces
  • 2 rows of spines
32
Q

Gasterophilus nasalis

A
  • eggs on intermandibular spaces
  • 3rd stage instars attach around pylorus and duodenum
  • yellow in fresh feces
  • 1 row of spines
33
Q

Gasterophilus

  • pathogenesis and lesions
  • CS
A
  • adult fly is annoying
  • attached instars can provoke an inflammatory rxn
  • Fly worry
34
Q

Gasterophilus

  • Dx
  • Tx and prevention
A
  • differentiate based on color, spines and location in host
  • seen during gastroscopy
  • manual removal of eggs
  • endoparasiticides for instar stages

Parasit Exam 3 (11 decks)

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