Researchers in Australia report development of a new type of gold nanoparticle that destroys the parasite responsible for toxoplasmosis, a potentially serious disease acquired by handling the feces of infected cats or eating undercooked meat. Their so-called “golden bullet” could provide a safer, more effective alternative for treating the disease than conventional drug therapy, they say. Toxoplasma gondii, the parasite that causes the disease, infects more than 60 million people in the United States alone.