Worms and wiggly things

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Across
  1. 3. climate associated with increased risk for schistosomiasis; hot and rainy climate (8)
  2. 5. friendly characteristic (8)
  3. 10. Strongyloides stercoralis is the only helminth capable of ... (4-9)
  4. 13. sign of parasitic infection shown on FBC (12)
  5. 14. definitive host for Echinococcus granulosus; a good boy (3)
  6. 15. pathognomonic sign for hydatid disease seen on abdominal USS; aquatic flowering plants (5,4)
  7. 16. trematode (5)
  8. 19. cestode (8)
  9. 20. consequence of lymphatic filariasis; enlargement and hardening of limbs due to chronic oedema (13)
  10. 21. parasitisation of human flesh by fly larvae (6)
  11. 22. fast; whitewater (5)
Down
  1. 1. drug of choice for treatment of schistosomiasis (12)
  2. 2. nematode infection spread by black flies and mosquitos (10)
  3. 4. nematode (9)
  4. 6. trematode disease characterised by Katayama fever, eggs found in bladder/bowel (15)
  5. 7. cestode disease characterised by hepatic cysts; Echinococcus granulosus (7)
  6. 8. drug of choice for medical treatment of hydatid (11)
  7. 9. a complication of hydatid disease that can cause anaphylaxis; burst (7)
  8. 11. natural habitat for Schistosoma spp. (10)
  9. 12. minimally invasive technique used to treat simple hydatid cysts; two of something (4)
  10. 17. beauty not of this world (8)
  11. 18. parasitic worm (8)