Toxoplasma gondii is a widespread parasite of animals that causes zoonotic infections in
humans. Previous studies have revealed a strongly clonal population structure in North
America and Europe, while strains from South America are genetically separate and more
diverse. However, the composition within North America has been questioned by recent
descriptions of genetically more variable strains from this region. Here, we examined an
expanded set of isolates using sequenced-based phylogenetic and population analyses to …