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Native reptile populations on Christmas Island have been in severe decline with two species, Lister鈥檚 gecko and the blue-tailed skink, entirely disappearing from the wild. While previously the main driver for this decline is likely predation by invasive species and habitat destruction, a silent killer is now threatening to wipe the species out entirely.

Those bred in captivity on the Australian Territory in the Indian Ocean have also been mysteriously dying, leaving the two species 鈥� which number only around 1000 each 鈥� in danger of extinction. Veterinary scientists from the University of Sydney, the Australian Registry of Wildlife Health and the Taronga Conservation Society Australia have now discovered the cause of these deaths: a bacterium, Enterococcus lacertideformus (E. lacertideformus).

The bacterium was discovered in 2014 after captive reptiles presented with facial deformities and lethargy, and some even died. Samples were collected and analysed using microscopy and genetic testing.

The researchers鈥� findings, published in , will inform antibiotic trials on the reptiles to see if the infection can be treated.

The bacterium grows in the animal鈥檚 head, then in its internal organs, before eventually causing death. It can be spread by direct contact 鈥� including through reptiles鈥� mouths, or via reptiles biting one another 鈥� often during breeding season fights.聽

鈥淭his means that healthy captive animals need to be kept apart from infected ones and should also be kept away from areas where infected animals have been,鈥� said Jessica Agius, co-lead researcher and PhD candidate in the Sydney School of Veterinary Science.

Ms Agius and the research team not only identified the bacterium, they decoded its genetic structure using whole genome sequencing.

Specific genes were identified that are likely to be associated with the bacterium鈥檚 ability to infect its host, invade its tissues and avoid the immune system.

鈥淲e also found that the bacterium can surround itself with a biofilm 鈥� a 鈥榗ommunity of bacteria鈥� that can help it survive,鈥� Ms Agius said.

鈥淯nderstanding how聽E. lacertideformus聽produces and maintains the biofilm may provide insights on how to treat other species of biofilm-forming bacteria.鈥�

The search of the genetic code suggested that the killer bacterium was susceptible to most antibiotics.

笔谤辞蹿别蝉蝉辞谤听David Phalen, research co-lead and Ms Agius鈥� PhD supervisor, said: 鈥淭his suggests that infected animals might be successfully treated. That鈥檚 what we need to determine now.鈥�

In another effort to protect the endangered reptiles on Christmas Island, a population of blue-tailed skinks has been established on the Cocos Islands. Ms Agius played a critical role in the translocation, testing reptiles on the Cocos Islands to make sure that they were free of聽E. lacertideformus.听听

鈥淚t鈥檚 critical we act now to ensure these native reptiles survive,鈥� Ms Agius said.

Declaration: The authors thank the Westmead Institute for Medical Research, Sydney School of Veterinary Science 鈥� University of Sydney, Australian Registry of Wildlife Health - Taronga Conservation Society Australia, and Christmas Island National Park 鈥� Parks Australia for their logistical and financial support.聽

Hero image: Lister's gecko. Credit: Parks Australia.