An 18-month-old female koala named Bamse has become the first to receive a revolutionary chlamydia vaccine in a two-dose format, significantly easing treatment of this serious disease threatening koalas across Australia.
- First koala treated with new double-dose vaccine implant
- Implant releases booster slowly over 30 days, minimizing stress
- Chlamydia infections dropped 75% in treated southern Queensland population
What happened
Bamse, a young female koala from Burleigh, Queensland, was the first to receive a new chlamydia vaccine combining an injection with a slow-release implant. This new format delivers the necessary double dose in one procedure rather than requiring two captures, which are stressful and resource-intensive. The implant breaks down over 30 days to release the booster dose, a breakthrough that makes large-scale treatment in wild populations feasible.
Since receiving her treatment in May, Bamse was monitored via a GPS collar and showed no signs of chlamydia one month after treatment. Following her, four more koalas received the same vaccine method and were returned to their habitats. This innovative approach builds on years of vaccine work to address chlamydia, a disease infecting up to 90% of some isolated populations and threatening koalas' survival by causing infertility and blindness.
Why it feels good
Koalas' fight against chlamydia has been a serious conservation challenge, as the disease reduces fertility and leads to blindness, pushing populations toward local extinction. The new double-dose vaccine method significantly reduces the stress on these sensitive animals by avoiding the need for multiple captures. It also conserves resources and makes vaccination programs more scalable and effective.
The early success in southern Queensland's koalas has seen infection rates drop by about 75%, and the population has started to stabilize. The birth of numerous joeys and grand-joeys following treatment offers heartening signs for the species’ recovery. This breakthrough gives conservationists renewed optimism for preserving an icon of Australia’s biodiversity.
What to enjoy or watch next
Continued monitoring of Bamse and other vaccinated koalas will provide valuable data on the long-term effectiveness of this treatment. Veterinary teams will watch closely as these koalas come into breeding age, hoping to witness healthy joey births and survival as confirmation that the vaccine campaign is sustaining populations.
The vaccine’s success could serve as a model for addressing infectious diseases in other wildlife species facing similar threats. For those interested in conservation and animal health, following the ongoing developments at Currumbin Wildlife Hospital, Queensland University of Technology, and other Australian centers will showcase how science and care are combining to protect koalas and other vulnerable animals.