A Public Health Agency of Canada (PHAC) expert is advising Canadians to ventilate and clean seasonal buildings before use to reduce hantavirus exposure [1].

These warnings come as the 2026 cottage season begins in rural regions across Canada [2]. The guidance follows a spike in public health concerns after hantavirus exposures were linked to the MV Hondius cruise ship [3, 4].

Officials recommend that owners of cottages, sheds, and cabins take specific steps to ensure safety before occupying these spaces. A PHAC expert said, "If you are opening up outlying buildings, whether it's a shed or a cottage (or a) cabin ... let it air out as much as you can. Open windows, open doors" [1].

Proper cleaning techniques are essential to prevent the virus from becoming airborne. The expert said, "If you see feces, spray them with a mild detergent or bleach solution and let them sit for a while before sweeping or vacuuming them up" [1].

The current alert follows a specific incident involving the MV Hondius. Six Canadians are currently isolating at home after being exposed to the virus on the vessel [3]. Additionally, more than 140 asymptomatic passengers and crew were expected to disembark in the Canary Islands [4].

Canadian consular officials have traveled to the Canary Islands to coordinate with those affected by the cruise ship incident [4]. While that event occurred at sea, PHAC is using the moment to remind the general public about the risks associated with rodent-infested rural properties during the spring transition [1, 2].

“"Open windows, open doors."”

The PHAC warning highlights a strategic effort to leverage a high-profile international health incident to reinforce domestic preventative health measures. By linking the cruise ship outbreak to the seasonal opening of rural properties, health officials are attempting to increase public vigilance against a rare but serious respiratory disease during a high-risk window for rodent activity.