In a three-year study of almost 600 koalas admitted to the Australian Zoo Wildlife Hospital in Queensland, 73.8% of the animals were infected with at least one species of the parasitic protozoal genus Trypanosoma, the most common of which was T. irwini.
Nun estudo de tres anos cuns 600 exemplares admitidos no Australian Zoo Wildlife Hospital de Queensland, determinouse que o 73,8% dos animais estaban infectados polo menos cunha especie parasita de protozoos do xénero Trypanosoma, sendo o máis común o Trypanosoma irwini.