Thelazia - Cattle

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Thelazia species:

  • Bovine "eyeworm", a spiruroid nematode (white thread-like, 1-2cm long; prevalence approximately 40% in dairy cattle)
  • Found in conjunctival sac, inner aspect third eyelid, lachrymal duct
  • Indirect life-cycle (intermediate host: nuisance flies, Musca spp.)
  • Heavy infections may cause lachrymation and conjunctivitis.