Researchers engineer brain-infecting parasite into living drug delivery system

Toxoplasma gondii is a protozoan parasite famous for its cunning ways. This microbial manipulator can only reproduce inside of cats, so, if it finds itself in another mammalian host, like a rat, it alters the rodent’s behavior to make it less fearful of felines. This effect has even been found in wild spotted hyena cubs, who behave more boldly toward lions when infected with T. gondii.

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