Koala vaccine hailed but rollout cost too much to bear

UniSC researchers have developed the first chlamydia vaccine to protect koalas from the disease. (Darren England/AAP PHOTOS)

A proposed rollout of a world-first chlamydia vaccine for koalas could cost "squillions and squillions", wildlife advocates warn.

University of the Sunshine Coast researchers have spent more than a decade developing the breakthrough, single-use vaccine which they hope to launch in 2026.