Medicine & USMLE

Loa loa

  1. Giardia lamblia
  2. Toxoplasma gondii
  3. Entamoeba histolytica
  4. Cryptosporidium
  5. Naegleria fowleri
  6. Trypanosoma brucei
  7. Plasmodium Overview
  8. Plasmodium Disease (Malaria)
  9. Babesia
  10. Trypanosoma cruzi
  11. Leishmania
  12. Trichomonas vaginalis
  13. Enterobius vermicularis (pinworm)
  14. Ascaris lumbricoides (giant roundworm)
  15. Strongyloides stercoralis (threadworm)
  16. Ancylostoma and Necator
  17. Trichinella spiralis
  18. Trichuris trichiura (whipworm)
  19. Toxocara canis
  20. Onchocerca volvulus
  21. Loa loa
  22. Wuchereria bancrofti
  23. Taenia solium
  24. Diphyllobothrium latum
  25. Echinococcus granulosus
  26. Schistosoma
  27. Clonorchis sinensis
  28. Sarcoptes scabiei (Scabies)
  29. Pediculus humanis and Phthirus pubis (Lice)


Loa loa is a species of roundworm parasite that infects humans via the bite of the deer fly. Subcutaneous migrations of the worm can be visible when it crosses the conjunctiva of the eye, as well as cause subcutaneous swellings under the surface of the skin, formally called Calabar swellings. Infections with loa loa are commonly treated with DEC, or diethylcarbamazine. 

Key Points

  • Loa Loa
    • Characteristics
      • Type of nematode (roundworm) parasite
    • Transmission
      • Via bite of deer fly (Chrysops)
    • Presentation: Loiasis
      • Transient swelling in skin
        • Also known as Calabar swellings
      • Worm seen in conjunctiva of eye
      • Eosinophilia
    • Diagnosis
      • Find worm in skin, eye, or blood smear
    • Treatment
      • Diethylcarbamazine (DEC)