While the outbreak aboard a cruise ship in the Atlantic is concerning, the virus isn’t easily transmitted through casual contact.

The hantavirus-hit cruise ship MV Hondius departed Cape Verde for Tenerife on Wednesday, as authorities rush to trace anyone who may have come into contact with the virus.

The World Health Organization said the risk to the wider public was low but added that limited human-to-human transmission had been reported in some strains of the virus.