![]() ![]() Or maybe the parasites, which produce the neurotransmitter dopamine and interact with the cells it infects, modifies behavior of its host. ![]() Perhaps the immune response, while keeping the parasites in check, causes collateral damage elsewhere. Now there is growing evidence that some people, maybe a lot of people, have subtler symptoms triggered by the infection. ![]() They include devastating damage to the brain, nervous system and eyes. But when an unsuspecting woman gets infected during pregnancy and passes the parasite on to her unborn child, the consequences can be profound. A working immune system can keep the parasite in check, so only a minority of those infected has significant symptoms. Nearly one-third of the 7.25 billion people on earth, including an estimated 60 million people in the United States, are chronically infected with the protozoan Toxoplasma gondii. ![]()
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