Apicomplexa are intracellular parasites that severely impact human health and economic prosperity in Australia and around the world. They include the malaria-causing parasite Plasmodium and the opportunistic pathogen Toxoplasma gondii. Our focus is predominantly on Toxoplasma, since the types of questions we are addressing are usually easiest to answer in this organism, although we collaborate extensively with the highly integrated malaria research community at ANU to translate our studies into Plasmodium parasites.