NAVLE Rabbits

Rabbit Cuterebriasis Study Guide

March 28, 2026 20 min read 18 views
Cuterebriasis is a parasitic infestation caused by larvae of Cuterebra species (bot flies, order Diptera, family Cuterebridae).

Overview and Clinical Importance

Cuterebriasis is a parasitic infestation caused by larvae of Cuterebra species (bot flies, order Diptera, family Cuterebridae). While rabbits and rodents are the natural hosts for these obligate parasites, domestic pet rabbits represent atypical hosts that can develop severe, potentially life-threatening disease due to aberrant larval migration. Understanding this multisystemic parasitosis is critical for NAVLE examination as it presents diagnostic challenges and requires prompt recognition to prevent fatal complications.

Life Stage Description
Adult Fly Large (1-2 cm), bee-like appearance with robust body. Non-feeding adults with vestigial mouthparts. Lifespan: approximately 2 weeks. Active in late spring through early fall.
Egg Deposition Female lays 5-15 eggs per site (up to 2,000 total) near rabbit burrows, along rabbit runs, or on vegetation and stones in rabbit habitat. Eggs do NOT attach directly to the host.
First Instar Larva Eggs hatch in response to sudden temperature increase (body heat from passing host). Slender, transparent larvae (1-1.5 mm long) attach to host fur and migrate to natural body openings (nares, mouth, rarely wounds). Enter through mucous membranes, NOT through intact skin.
Second Instar Larva Gray to white/cream color, 5-15 mm long. Larvae migrate through subcutaneous tissues to preferred sites (usually head, neck, dorsum).
Third Instar Larva Dark brown to black, heavily spined, 3-4.5 cm long. Creates characteristic warble (subcutaneous cyst) with breathing pore (2-4 mm opening). Development takes 3-7 weeks in host. Most commonly found stage by veterinarians.
Pupation Mature third instar exits through breathing pore, drops to ground, and pupates in soil. Pupae overwinter in cool climates. Adults emerge in spring/summer to continue cycle.

Parasite Biology and Taxonomy

Taxonomy

The genus Cuterebra contains more than 70 species restricted to the Western Hemisphere (North and South America). Two important subgenera affect lagomorphs:

  • Subgenus Trypoderma: 22 species that primarily parasitize rabbits and hares (lagomorphs)
  • Subgenus Cuterebra: 12 species that parasitize rodents

The most clinically relevant species for domestic rabbits is Cuterebra buccata, though other lagomorph-infesting species may be involved depending on geographic location.

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