Bots/grubs Flashcards
what is myiasis
the condition of being infested or infected by fly larvae that feed on the host’s living or dead tissue, body fluids, or ingesta
when does myiasis start
when a female fly lays her eggs or larvae on or near a living host animal
sites of infestation (5)
- enteric
- cutaneous
- nasopharyngeal
- ocular
- rectal
family: oestridae
- stomach bots, nose bots, rodent bots, grubs
- obligate mammal parasites
- host specific
- rarely affect people
- nasopharyngeal, enteric, cutaneous myiasis
- univoltine
- can’t bite
oestridae life cycle
- adults mate soon after emergence
- adults live <1 month
- females place offspring on host
- larvae reside in host
- mature larvae exist host and pupate in soil
gasterophilus
- horse stomach bots
- eggs anchored to hairs, licking stimulates hatching
- L1 enter mouth, burrow in tongue, exit to stomach
- exit horse in speing
treatment of gasterophilus
macrocyclic lactones (ivermectin, moxidectin) –> treat in mid september (before they get into stomach)
hypoderma
- cattle grubs
- univoltine
- adults short lived
- eggs glued to host hairs, L1 enter follicles
- hide damage
nasal bots
- oestrus ovis in sheep
- cephenemyia in deer, cervids
- univoltine
- adults late spring, L1 on muzzle, L3 exit nostrile, pupate in soil
treatment of nasal bots
oral ivermectin
cuterebra
- warble flies
- hosts are rodents, lagomorphs, cattle, monkeys, humans (cats/dogs are incidental hosts)
- eggs in soil, larva enters SQ tissue
what is strike
cutaneous myiasis, usually facultative, can be obligatory
symptoms of strike
- inappetance, drowsiness, irritation
- aural, rectal, ocular forms
culprits of strike in sheep
blow flies (calliphoridae), metallic –> carrion (blow fly larval habitat)
screwworm
- obligatory myiasis
- eradicated in many places (sterile insect technique)
