MT-CYB and coinfection: The fact that potoroo and quokka-derived samples harboured co-infections with T. worthingtonorum and T. gilberti or T. brachyuri, respectively, associated with a yet incomplete database of mitochondrial gene information from many Theileria spp., hinders an accurate and unambiguous characterisation of these isolates at both cox3 and cytB loci (Figs 2 and 3).