The recent outbreak of hantavirus infection on the Dutch cruise ship MV Hondius raises several questions and concerns. Dutch ornithologist Leo Schilperoord was the first person to die of hantavirus infection on the ship on April 11, 2026. He and his wife, Mirjam, 69, had recently visited northern Patagonia in Argentina, 1,500 miles north and before boarding the ship at a southern Argentine port. So far there have been eight cases in total with three fatalities.
A reconstructed timeline of the events from various sources:
The major issue is the delay in initiating diagnostic and preventive measures and implementing quarantine even after our experience with COVID-19. The first passenger became symptomatic on April 6, but it took a month (on May 11) for the first person to be quarantined in the U.S. Why didn’t the U.S. CDC get involved earlier while there were about two dozen Americans on board?
On May 7, 2026, the CDC sent a team to meet the cruise ship in the Canary Islands, almost a month after the first death due to hantavirus. CDC reported that it is working with partners (federal government, state and local and international) on safely repatriating American passengers from the cruise ship to a facility in Nebraska with specialized medical capabilities. The team was prepared to assess exposure risk among U.S. passengers and determine appropriate monitoring measures. It seems like too little too late. The CDC should have sent investigative teams to South America and coordinated with other health agencies to implement a detailed contact tracing and strict isolation.
Between the epidemiological weeks 1 and 10 of 2026 (4 January to 14 March 2026), the Ministry of Public Health in Argentina reported 12 confirmed hantavirus cases and two deaths in Salta Province, northwestern Argentina. In addition, there were 50 suspected cases. Apparently, there were multiple cases and deaths due to hantavirus in the same area in 2025 also. The Andes virus variant of the hantavirus from this area had already exhibited the troublesome feature of person-to-person spread of the disease. Why was this outbreak not followed up and investigated?
The incubation period of hantavirus is noted to be 1 to 8 weeks. The Nebraska facility is apparently only planning for a total quarantine period of 42 days. It should have been 56 days, if not more. The Dutch couple had been in Argentina for several months, since November last year. Sometime around a month prior to embarking the cruise ship, they took a trip to northern Argentina where hantavirus is endemic. This points to a prolonged incubation period.
Hantavirus is a deadly disease with up to 50 percent mortality and requires specialized PPE including shoe covers to be used by health care personnel. However, pictures circulating in the media show health workers wearing long gowns with exposed shoes spraying the passengers at the Tenerife airport. Are all the mandatory precautions being followed?
Why is the CDC medical journal Emerging Infectious Diseases not publishing the details of the cases and related information so that physicians and other clinicians in the U.S. will become more aware of this emerging disease?
WHO Director-General Tedros Ghebreyesus and the acting CDC Director Jay Bhattacharya were optimistic, saying, “This is not another COVID-19.” Hopefully not, but we do not want to see a repeat of the public health failures of COVID-19. While the CDC and WHO are trying, they can always step it up.
P. Dileep Kumar is a board-certified practicing hospitalist specializing in internal medicine. Dr. Kumar is actively engaged with professional associations such as the American College of Physicians, Michigan State Medical Society, and the American Medical Association. He has held a variety of leadership roles and has authored more than 100 publications in various medical journals and a book on rabies (Biography of Disease Series). Additionally, he has presented more than 50 papers at various national and international medical conferences. Several of his papers are widely cited in the literature and referenced in various textbooks.
Dr. Kumar has been involved in various hospital committees with advanced knowledge of Centers for Medicare & Medicaid Services (CMS) initiatives such as meaningful use, value-based purchasing, and Accountable Care Organizations.
Furthermore, Dr. Kumar has served as a scientific peer reviewer for various medical journals, including the British Medical Journal, Annals of Internal Medicine, American Journal of Cardiology, Physician Leadership Journal, and European Journal of Clinical Microbiology & Infectious Diseases.
Infectious Disease 
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Hantavirus cruise ship outbreak exposes CDC missteps – KevinMD.com
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