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Myiasis by aseem

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Myiasis by aseem

  1. 1. MYIASIS Syn : Blow/Bot/Fly-Strike
  2. 2. Introduction • Gk : “Muia” – Fly ; Scot: ‘Boateig’ – Maggot ; Blow – to deposit ; Screw – spinous horny projections • infestation of body tissues of humans and animals by the larvae (maggots) of Diptera – Frederich William Hope (1840) • 02 groups (based on Myasis-causation) : Obligatory (Larval Stage in Mammalian body) Facultative (Decaying flesh, Wound)
  3. 3. Clinical classification (ICD-10) • DERMAL / SUB-DERMAL • CUTANEOUS – Creeping – Furuncular – Traumatic • • • • • NASOPHARYNGEAL OPHTHALMOMYIASIS AURICULAR INTESTINAL UROGENITAL
  4. 4. ETIOLOGY Muscidae (Wound Myiasis / Accidental) -Musca domestica (Housefly) -Fannia canicularis (lesser / latrine housefly) Calliphoridae (blowflies – Metallic / Non-metallic) • • • • • • • Cochliomyia (NW Screwworm) Chrysomyia (OW Screwworm) Cordylobia (Tumbu fly / Sahara fly) Auchmeromyia (Senegal Sucker/Congo floor m.) Calliphora (Bluebottle) Lucilia (Phaenicia) (Greenbottle) MDT (Serricata) Phormia (Black blowfish)
  5. 5. Sarcophagidae: (Flesh flies) -Sarcophaga -Wohlfahrtia Oestridae -Dermatobia (human botfly) FM -Gasterophilus (horse botfly) GI -Oestrus (Sheep nostril fly) NP -Hypoderma (Warble heel fly) ?HES Cuterebra (Rabbit-rodent botfly)
  6. 6. • aa
  7. 7. CLINICAL FEATURES FACULTATIVE / TRAUMATIC WOUND MYIASIS Eggs / Larvae in suppurating tissues Calliphora, Lucilia, Phormia, Sarcophaga OBLIGATORY CUTANEOUS MYIAISIS CREEPING ERUPTIONS FURUNCULAR MYIASIS Cordylobia, Cochliomyia, Dermatobia, Hypoderma, Gastrophilus, Oestrus assoc with HES / Constt symptoms ; Exposed areas
  8. 8. Traumatic Myiasis • aa
  9. 9. Furuncular Myiasis Insiduous, tender boils central punctum Serosanguinous discharge posterior end of the larva, Spiracles visible in punctum Lymphangitis , regional LAN Rapid resolution on removal of larva
  10. 10. Creeping Eruptions Resembles cutaneous larva migrans tortuous, thread-like red line with terminal vesicle marks the passage of the larva
  11. 11. • aa
  12. 12. • aa
  13. 13. TREATMENT Wound myiasis debridement and irrigation (Chloroform, Turpentine guaze, Ether, Paraffin, Eusol) treatment of secondary infections Mechanical Forceps Extraction
  14. 14. Furuncular myiasis traditional methods: pork fat, mineral oil, petrolatum, butter, beeswax, cigarette ash, chewing gum surgical (I & D  Extraction) Creeping Eruptions Extraction beyond the vesicle Ethyl Chloride freeze Ivermectin 12mg PO stat ; Albendazole 400mg
  15. 15. THANK YOU

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