Volume 23, Number 9—September 2017
Possible Role of Fish as Transport Hosts for Dracunculus spp. Larvae
|Fish species||Dracunculus sp.||No. fish consumed/no. offered*||Total no. copepods†||Days until euthanasia of ferret‡||Dracunculus infection status of ferret||No. worms recovered and sex§|
|Mosquitofish (Gambusia affinis)||D. insignis||28/30||300||91 and 134||–||0|
|Tilapia (Oreochromis niloticus)
||91 and 134
|Fathead minnow (Pimephales promelas)||D. insignis||30/30||300||91 and 118||+||1M|
*In groups of 5 fish/day for 6 days.
†>25% of copepods infected.
‡The D. insignis worm–exposed ferrets have 2 entries for days until euthanasia because these animals were exposed to fish at 2 different time points with copepods infected with larvae from 2 different worms.
§All worms were recovered from the subcutaneous tissues of the limbs.
¶Of these 6 female worms, 5 were gravid, indicating a male worm either was missed or had died before necropsy.