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THE emergence of a hantavirus outbreak linked to the cruise ship MV Hondius has reignited traumatic memories of the COVID-19 pandemic, as health officials around the world scramble to reassure the public while confronting a surge of misinformation, online conspiracy theories and growing public anxiety.
Although experts insist the outbreak does not pose a pandemic-level threat, the combination of a deadly rodent-borne virus, multiple fatalities and quarantine measures aboard a luxury liner has fuelled intense global attention reminiscent of the earliest days of COVID-19.
Reuters reported that as of Thursday, health authorities had confirmed 11 hantavirus cases linked to the outbreak, including three deaths among passengers who had travelled aboard the vessel.
Dozens of additional passengers are now being monitored after returning to nearly 20 countries.
The outbreak has forced global public health agencies to revisit one of the most contentious lessons of the COVID era: how to communicate clearly and rapidly during an unfolding health emergency without amplifying fear.
“Hantavirus thread incoming,” the Illinois Department of Public Health posted on social media earlier this week while discussing an unrelated and non-threatening domestic case.
“But you have to promise to read this whole thread before panic-texting your group chat. Deal?”
Health officials interviewed by Reuters said authorities were consciously attempting to avoid the communication failures that characterised the early stages of the COVID pandemic, when inconsistent messaging, delayed responses and politicised debates eroded public trust in scientific institutions.
“We spend half of our time discussing how we will communicate,” said Gianfranco Spiteri, emergencies lead at the European Centre for Disease Prevention and Control.
Public health experts acknowledged that modern audiences remain deeply sensitive to any outbreak involving quarantine procedures, cruise ships or unfamiliar viruses, particularly after years of pandemic trauma.
During COVID-19, governments across the world faced criticism for delayed responses, contradictory guidance and uneven vaccine rollouts, while misinformation flourished across digital platforms.
One study later found that trust in public health institutions declined in 20 of 27 European Union countries between 2020 and 2022.
Officials responding to the current hantavirus outbreak said they were now attempting to combine transparency with empathy while openly acknowledging scientific uncertainties.
“There are people who say we are overdoing it, and on the other extreme, that we’re not doing enough,” Spiteri said.
“We always base our messages on the evidence we have.”
Despite repeated reassurances from experts that the public risk remains low, social media platforms have become saturated with speculation, fear and false claims suggesting the outbreak could trigger another global lockdown.
Some online posts have falsely portrayed hantavirus as a greater existential threat than COVID-19, while others have promoted unproven treatments including ivermectin, vitamin D and zinc supplements.
Conspiracy theories have also proliferated, including baseless claims linking the outbreak to Pfizer vaccines or alleging the crisis was fabricated to benefit pharmaceutical companies.
Sander van der Linden, a misinformation expert and psychology professor at the University of Cambridge, warned that societies remained dangerously vulnerable to false narratives during health emergencies.
“We need to do more preparatory work to create resilience in the population,” he said.
Health experts stressed that unlike the coronavirus outbreak in 2020, hantavirus is already well understood scientifically and established containment measures exist.
The Andes strain involved in the current outbreak has circulated for decades in parts of Argentina and Chile, while preliminary analysis of samples taken from the cruise ship reportedly showed no significant mutation or variation from previously known strains.
“We have kind of lost perspective,” said Gustavo Palacios, a hantavirus expert at the Icahn School of Medicine at Mount Sinai in the United States.
An outbreak, he said, could still represent a serious public health incident without escalating into a global pandemic.
The World Health Organization has adopted a far more aggressive communication strategy than during the early stages of COVID-19, holding regular press briefings, issuing public alerts and directly responding to misinformation through online question-and-answer sessions.
WHO Director-General Tedros Adhanom Ghebreyesus even issued an unusual open letter addressed directly to residents of Tenerife after the MV Hondius docked on the Spanish island under strict health controls.
“But I need you to hear me clearly: this is not another COVID,” Tedros wrote.
“The current public health risk from hantavirus remains low. My colleagues and I have said this unequivocally, and I will say it again to you now.”
Some agencies, however, were criticised for responding too slowly. In the United States, the Centers for Disease Control and Prevention only issued its first formal communication regarding the outbreak five days after the story emerged publicly.
“One of the things this is teaching us is a lesson we should have learned from COVID: What we say is really important,” said infectious disease specialist Michael Osterholm of the University of Minnesota.
The imagery surrounding the outbreak has also intensified public concern because of its resemblance to the infamous Diamond Princess incident during the opening stages of the COVID pandemic in 2020, when more than 700 passengers were infected and 14 people died while quarantined off the coast of Japan.
“The whole cruise ship thing … is a very significant memory from the beginning of COVID,” said Krutika Kuppalli, associate professor of medicine at the University of Texas Southwestern Medical Center.
“There’s an emotional reaction that is stirring people.”
For many residents in Tenerife, the arrival of international health officials and the visible quarantine operation revived memories many hoped had been left behind.
“It gave me the impression that this isn’t just the flu – otherwise all these people wouldn’t be coming,” said Laura Millán, a resident of Tenerife who witnessed passengers disembarking under strict infection-control procedures.
At the same time, she acknowledged that the strong international response also helped reassure the public that authorities were taking the outbreak seriously and implementing appropriate safety measures. - May 15, 2026
