You can become immune to toxoplasmosis. When the parasite infects healthy individuals, your immune system will usually fight against the parasite and keep it from causing any serious symptoms. If you have a parasite that your immune system is keeping at bay, then generally you are immune to further infection. Some people live their whole lives with the parasite in a dormant state. If, however, you suffer from a weakened immune system you cannot become immune to the parasite and oftentimes must take medication for the rest of your life. While some pregnant women can be immune to toxoplasmosis, your child is not and can be infected by the dormant parasites.
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