http://www.computerworld.com.au/index.php/id;1543938596
According to Medibank Private thousands of 457 visa holders are uninsured, despite immigration regulations specifying that sponsoring employers are responsible for the cost of medical treatment and repatriation (if required) for the visa holder and any dependents.
The IT industry employs more 457 visa holders than any other industry, and while it may seem to carry a lower risk compared to jobs in mining and manufacturing, even the simplest of medical treatments can end up costing the employer thousands of dollars, according to the health insurer.