A new vaccine is being trialled which is hoping to lead to a human vaccine against the deadly, dengue and zika viruses.
Kunjin virus, which is transmitted by mosquitoes, causes lesions in the skin of crocodiles but there is hope that a newly developed vaccine can have broad applications, include pathogens of mosquito borne diseases which affects humans.
Professor Roy Hall says scientists are still trying to learn about how the transmissions occur.