The World Health Organization has confirmed it is actively monitoring and supporting a public health response following the detection of hantavirus cases linked to a cruise vessel sailing in the Atlantic Ocean.

According to the agency, one case has been laboratory confirmed, while five additional cases remain under investigation, bringing the total number of affected individuals to six. Of these, three deaths have been recorded, while one patient is currently receiving intensive care in South Africa.

Health authorities say detailed investigations are ongoing, including further laboratory testing and epidemiological assessments to determine the source and extent of the outbreak. Medical care and support are also being provided to passengers and crew on board the vessel.

The WHO noted that genomic sequencing of the virus is underway as part of efforts to better understand the strain involved and guide response strategies.

Hantavirus infections are typically associated with environmental exposure, particularly contact with urine or faeces of infected rodents. Although rare, limited human-to-human transmission has been documented, and the infection can lead to severe respiratory illness requiring close medical monitoring and supportive care.

The organisation said it is coordinating with relevant member states and the ship’s operators to facilitate the medical evacuation of two symptomatic passengers, while also conducting a comprehensive public health risk assessment for those still on board.

The WHO added that it has notified National Focal Points in line with the International Health Regulations and will issue a Disease Outbreak News update for the public as investigations progress.