New health warning for West Aussies in Bali New health warning for West Aussies travelling to Bali. WEST Australians are being warned about travelling overseas after a dramatic increase in infectious diseases in tourists coming back from Bali and other Asian countries. A study being presented today at the Annual Meeting of the Australasian Society for Infectious Diseases (ASID) reveals that increased travel to Bali by West Australians has resulted in a dramatic increase in overseas-acquired cases of a range of infectious diseases. Worryingly, many diseases acquired overseas are resistant to normal treatment with antibiotics. The most common disease acquired from Indonesia was dengue fever, gastroenteritis, Chlamydia and gonorrhea. The study found there was a significant impact on individuals and the health system from the infections. The study's findings comes as experts at the conference warn of the growing risk of travellers to India, China and South East Asia bringing home E.coli infections that are immune to treatment with a normal course of antibiotic tablets. People with an antibiotic resistant E.coli urinary tract infection (UTI) are up to six times more likely to have recently travelled to India than those with a typical E. coli UTI, a new study has found.