A 10-year-old boy and a 14-year-old girl, both from Victoria, are in isolation at Bali’s Sanglah Public Hospital waiting on results of tests for the virus, health authorities say.

They join 22-year-old Melbourne woman Bobbie Masoner, who was on Wednesday confirmed as one of Indonesia’s first swine flu patients, and 12-year-old Victorian boy George Coltman, who is also waiting on test results.

It is understood all four were on the same flight from Melbourne.

Masoner’s diagnosis sparked concern among Indonesian health authorities that the Australian tourists who flock to Bali could spread the virus in Indonesia, a country that has so far avoided the worst of the pandemic.

As a result, Indonesia has announced tighter controls on Australians entering the country.