AJ Cann [creativecommons license] via Wikimedia CommonsToxoplasmosis may be the most common parasitic infection worldwide, affecting more than two billion people. Existing treatments have serious side effects, can cause hypersensitivity in some patients and are ineffective during some of the parasite’s life stages. There is no preventative vaccine. New treatments for toxoplasmosis are desperately needed. Now it seems that need may be met by a drug that was initially developed to treat malaria.