WHO Reports Hantavirus Outbreak: 12 Cases and 3 Deaths Confirmed

The World Health Organization (WHO) has reported that the number of confirmed hantavirus cases has risen to 12, with three deaths recorded as of May 2026.

The updated figures follow the confirmation of a new positive case in the Netherlands and a case involving a crew member on the MV Hondius cruise ship.

Public health officials have indicated that while the outbreak warrants a high level of preparedness, the current situation does not call for panic.

Details of the Current Outbreak

The confirmation of hantavirus among the crew of the MV Hondius cruise ship has drawn particular attention to the transmission of the virus in specific environments. The WHO has been monitoring the situation as the case count increased, including the most recent positive result identified in the Netherlands.

The rise to 12 reported cases and three fatalities underscores the severity of the virus when infection occurs, although the overall number of cases remains relatively low.

Understanding Hantavirus Transmission

Hantaviruses are zoonotic viruses, meaning they are naturally carried by rodents. Humans typically become infected through contact with rodents or their urine, droppings and saliva.

Transmission often occurs when rodent excretions are aerosolized—turned into small particles in the air—which are then inhaled by humans. While less common, infection can also occur through bites or scratches from an infected rodent.

Clinical Presentations and Symptoms

In humans, hantaviruses generally cause two distinct and severe syndromes depending on the type of virus and the geographical location of the infection.

One form is hantavirus pulmonary syndrome, which primarily affects the lungs. This condition often begins with flu-like symptoms, including:

• Fever
• Fatigue
• Muscle aches, particularly in the thighs, hips, and back
• Headaches, dizziness, or chills
• Gastrointestinal issues such as nausea, vomiting, or abdominal pain

As the illness progresses, patients may experience sudden respiratory failure, characterized by coughing and shortness of breath.

The second form is hemorrhagic fever with renal syndrome, which primarily affects the kidneys and blood vessels. This syndrome is often marked by kidney swelling and the presence of blood or excess protein in the urine.

Treatment and Prevention

There is currently no specific cure for hantavirus diseases. Medical management focuses on early supportive care, which involves close clinical monitoring and the management of cardiac, respiratory, and kidney complications to improve survival rates.

Prevention relies heavily on reducing human contact with infected rodents. Public health guidance generally emphasizes maintaining clean environments to discourage rodent infestations and taking precautions when cleaning areas where rodents may have been present.

The current outlook from health authorities emphasizes that while the MV Hondius outbreak and the cases in the Netherlands are significant, the risk to the general public remains low provided that standard preparedness and prevention measures are followed.