(CNN) The deaths of an American couple who became ill while vacationing in Fiji late last month are being investigated by health officials on the South Pacific Island, with help from the US Centers for Disease Control and Prevention, authorities said Tuesday.

Texas residents David and Michelle Paul arrived in Fiji on May 22, Fiji's Ministry of Health and Medical Services said in a statement. They were on holiday in the country's Western Division.

"Although they were provided medical treatment as standard of care, their illnesses progressively worsened and despite best efforts, they died within a few days of each other," the statement said.

Fiji's Ministry of Health said investigations into the cause of death are ongoing, but added that influenza has been ruled out.

"And at this stage we do not believe there is any risk to the public. It would be premature to speculate further on the cause of death until the investigation is complete," the ministry of health said.

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