Symptoms of raccoon roundworm typically appear between one and four weeks after exposure to eggs, according to county public health officials. They can include nausea, tiredness, lack of attention, loss of coordination, loss of muscle control, blindness, and coma.

Raccoon roundworm, known as Bylisascaris procyonis, is an intestinal parasitic infection that can affect the human spinal cord, brain and eyes, officials said.

Los Angeles County public health officials said Tuesday they are investigating two human cases of a rare infection known as raccoon roundworm in the South Bay area. No details about the patients were released.