Why Hantavirus Quarantine Duration Far Exceeds COVID-19 Protocols

A deadly outbreak involving hantavirus has been reported aboard a Dutch cruise ship sailing from Argentina in the Atlantic Ocean. According to data from the World Health Organisation (WHO), 11 cases have been confirmed to date, with three fatalities reported. Although no additional cases have been reported on land, health authorities have implemented strict preventive measures.

Eighteen passengers from the United States aboard the vessel until 10 May are now undergoing quarantine at the University of Nebraska Medical Center. Notably, the quarantine duration has been set at 42 days—significantly longer than the standard 14-day quarantine applied during the early stages of the COVID-19 pandemic in 2020.

Hantavirus is typically a family of viruses transmitted by rodents (rats) through urine, faeces, and saliva. However, the variant spreading on this cruise ship has been identified as the Andes virus, a South American strain with unique characteristics compared to other hantavirus types.

Initial symptoms of Andes virus infection resemble influenza, including fever, fatigue, and muscle ache. However, in severe cases, patients may develop Hantavirus Pulmonary Syndrome (HPS)—a condition characterised by severe inflammation of the lungs and fluid accumulation, causing acute respiratory distress.

The six-week quarantine period is based on the virus’s uncommon incubation timeline. Dan Shirley, an infection prevention expert from UW Health, explained that the Andes virus has an incubation window of between 4 to 42 days before symptoms emerge.

Several factors contribute to this extended incubation and quarantine duration. Although this outbreak is lethal, experts emphasise that the risk to the general public remains low. Luis Ostrosky, head of infectious diseases at UTHealth Houston, stated that this exposure is highly localised to a single cruise ship and all at-risk individuals have been identified.

As a general precaution against hantavirus, the public is advised to:

• Avoid contact with rodents and their droppings

• Ensure proper ventilation when cleaning areas potentially contaminated by rodent waste

• Use appropriate protective equipment when handling suspected rodent-contaminated materials

This outbreak serves as a reminder to the global health community that high human mobility can transport viruses across continents within days, necessitating adaptive quarantine systems that account for the unique characteristics of each pathogen.