Arterial Worm and Food Impaction

Food impactions in white-tailed deer can be caused by arterial worms that cause facial paralysis and allow food to accumulate in the jaw area.

Arterial worms, Elaeophora scheideri, parasitize wild ruminants and are usually associated with facial swelling due to food impactions and occasionally cause damage to teeth or jaw bones.  High worm loads result in reduced blood flow to the face which causes facial paralysis.  This paralysis will cause food to collect in the jaw area. 

Arterial worm infected deer.
Arterial worm infected white-tailed deer with associated food impaction.
 Arterial worm infected deer.
Arterial worm infected white-tailed deer with associated food impaction.

The adult nematode typically resides in the carotid arteries of the host where females produce larvae which lodge in the capillaries of the skin on the head.  The larvae are ingested by horseflies taking a blood meal, where they continue to develop and are then transmitted back to a deer where they migrate to the brain and then back to the carotid arteries. 

 



FWC Facts:
Manatees have molars but no front teeth (no incisors or canines). Manatee teeth are unusual among mammals because they are continually replaced throughout the animals' lives.

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