<p>It’s been an ordeal for those who embarked on a cruise across in early April and it’s not over yet. </p><p>The ship's passengers are being repatriated across the world after potential exposure to hantavirus, which caused the death of three passengers. </p><p>Among those heading home are four Australians who will soon be placed in a quarantine facility in Western Australia. </p><p>What is the virus, how does it spread and should we be worried about it? </p><p>Today epidemiologist Raina MacIntyre from UNSW on everything you need to know about hantavirus. </p><p>Featured: </p><p>Raina MacIntyre, epidemiologist and Professor of Global Biosecurity at the University of New South Wales</p>