Five of the seven guests who became ill from suspected alcohol poising at a 5-star resort on Fiji's Coral Coast have been discharged from Lautoka Hospital.
At least two of the four Australians who became sick are also heading home.
The group of seven became seriously ill after drinking pina coladas at the Warwick Fiji Resort.
Fiji's Deputy Prime Minister and Minister for Tourism Viliame Gavoka told local reporters in Suva on Monday that it was an "extremely isolated incident".
He said the fact that most of those affected have been discharged "is a good indication that it is not as serious as we expected".
"The Fijian government would like to reassure both local and international visitors to Fiji that this is a very isolated incident," he said.
"Thousands of tourists are currently visiting Fiji, and close to a million tourists visit annually, and safely. This is the only reported case of its kind that we've experienced in recent memory, and certainly nothing like this has been experienced this year.
"While we understand the concern, we want to emphasise that the tourism experience in Fiji is typically very safe, and we have acted immediately to try and discover the cause of what made these guests, at this resort, fall ill."
He added that the government will keep the public informed about the investigation.
Local journalist Mereoni Mili said it will take three to five day for the toxicology report to return and find out what happened.
Meanwhile, New Zealand's Foreign Affairs Ministry has increased its alert level to two out of four for Kiwis travelling to Fiji.
