A world-first vaccine to protect koalas from chlamydia infections has been approved in Australia. Developed by the University of the Sunshine Coast, the vaccine significantly reduces symptoms and mortality rates in koalas. While some conservationists support the vaccine, others argue that efforts should focus on preserving koala habitats, as habitat loss is a major threat to their survival. Koalas are endangered due to disease, habitat loss, and other factors, with predictions of potential extinction by 2050.