Usually indirect life cycle via terrestrial snail/slug
White tail deer is the "true host"
Alpaca's meningeal worm
Aberrant migration of parasite into CNS can occur in small ruminants, horses, camelids; usually spinal cord, infrequently brain → inflammation
Clinical presentation: Ataxia, hindlimb weakness or paralysis with progression to forelimbs, circling, head tilt, twisted neck, depression, blindness
Diagnosis: Compatible history (deer in pasture w/ small ruminants), physical & neurologic exam, CSF analysis, necropsy is confirmatory