Toxocariasis (Visceral or Ocular Larva Migrans) By Chelsea Marie, PhD, University of Virginia; William A Petri, Jr, MD, PhD, University of Virginia School of Medicine Reviewed / Revised Sep 2022 View Patient Education Pathophysiology Symptoms and Signs Diagnosis Treatment Prevention Key Points Topic Resources Toxocara canis Life... Toxocariasis is human infection with nematode ascarid larvae that ordinarily infect animals.