Dr Rob Grenfell wo mu kigo CSIRO yabwiye abanyamakuru kuri uyu wa kane ati: "Ubusanzwe bifata hafi igihe cy'umwaka umwe kugera ku myaka ibiri kugira ngo hagerwe kuri iki cyiciro, none mu by'ukuri twakigabanyije kiba igihe cy'amezi macye".
