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In people with weakened immune systems, especially those with AIDS, symptoms of toxoplasmosis are often brain-related and severe. Also, if toxoplasmosis affects the eyes of a person with a weakened immune system, there may be blurred vision, spots in the field of vision, eye pain and extreme sensitivity to light.
Up to half babies who become infected with toxoplasmosis during the pregnancy are born early (prematurely). The infection can damage the baby's eyes, nervous system, skin, and ears. Often, there are signs of infection at birth. However, babies with mild infections may not have symptoms for months or years after birth. If not treated, most children with this infection develop problems in their teens.