The coalas are dying, and climate change is affecting

The guilty is clamidia, a sexually transmitted virus that infects more than 100 million people worldwide every year and can cause infertility.

For coalas, uncontrolled chlamydia can cause painful blindness and cyste in the reproductive leaflet of an animal that can lead to death, writes CNN.

Worse still, antibiotics used to treat the disease can destroy the delicate flora of the intestines that koalas need to consume their basic eucalyptus - leaf diet, leading some to die of starvation after recovery.

This disease can also spread quickly, but experts say climate change is affecting the death of koalas as well.

Scientists are now testing vaccines against chlamydia to protect animals.