A deadly outbreak on a cruise ship has put a rare but lethal virus on the global radar
By the time the MV Hondius docked at Tenerife in the Canary Islands on the morning of 10 May, the world had been watching for days. The Dutch expedition cruise ship, which had departed Ushuaia in southern Argentina on 1 April carrying around 150 passengers and crew of 23 nationalities, had become the unlikely centre of a global health response involving 22 countries, the World Health Organization, the US Centers for Disease Control and Prevention, and the Australian Centre for Disease Control.
The cause: hantavirus. Specifically, the Andes strain – a rare and dangerous variant with a mortality rate that the CDC puts at 38 per cent for serious cases, with some clinical estimates reaching higher.
As of this week, eight cases have been confirmed or suspected among those on board, with three deaths. Passengers have been hospitalised across South Africa, the Netherlands, Germany, Spain, Switzerland and Saint Helena. The CDC has classified the outbreak as a Level 3 emergency response.
For most Australian office workers, hantavirus is not a daily workplace concern — and authorities are clear that it shouldn't become one. But for HR leaders and people managers, the outbreak raises questions that are entirely relevant to their roles: what does a novel infectious disease mean for duty of care obligations? How should employers communicate emerging health risks to staff? And are your pandemic response frameworks still fit for purpose?
What is hantavirus, and how does it spread?
Hantavirus is a family of viruses found primarily in rodents, and is not new. Human infection typically occurs through breathing in airborne particles from the droppings, urine or saliva of infected animals — most commonly rats and mice. The Australian Centre for Disease Control has confirmed there are no reports of hantavirus infection in humans in Australia, and the risk to Australians remains low.
The Andes strain, however, is distinctive. It is the only known type of hantavirus documented to spread between people — not just from animals to humans. That human-to-human transmission, while rare and typically requiring close prolonged contact, is what has drawn global attention to the MV Hondius outbreak.
Symptoms begin like influenza: fever, fatigue, muscle aches, nausea. But the disease can progress rapidly to severe respiratory failure, with lungs filling with fluid. The CDC puts the mortality rate for those who develop respiratory symptoms at 38 per cent; some clinical estimates place it higher, at up to 50 per cent. The CDC also notes that symptoms can appear anywhere from four to 42 days after exposure — a particularly long incubation window that complicates contact tracing and monitoring.
University of the Sunshine Coast Associate Professor and microbiologist Joanne Macdonald has noted publicly that the Andes virus is endemic in Argentina and Chile, and has a specific reservoir host found only in that region. That geographical specificity is a key reason why local transmission in Australia is considered highly unlikely.
The employer lens: duty of care and infectious disease
The fact that Australian workers are unlikely to contract hantavirus at their desks does not mean employers should file this story away. What the outbreak does – clearly and with urgency – is illustrate how quickly a rare pathogen can become a multi-country HR crisis.
Under Australia's Work Health and Safety laws, employers carry a primary duty of care to ensure, so far as is reasonably practicable, the health and safety of workers. That duty explicitly includes the risk of exposure to infectious diseases. WorkSafe Victoria's guidance on office health and safety lists infection risks from shared surfaces, common facilities and hot-desking arrangements as identifiable workplace hazards – hazards that require active risk management, not passive acknowledgement.
The practical implications for Australian workplaces in the current environment include several areas of focus.
Business travel to affected regions. Any employees with planned travel to Argentina, Chile or other parts of South America where the Andes virus is endemic should be briefed on the risks. Rodent exposure in rural or outdoor environments – common on adventure travel or field work – carries the primary transmission risk. Employers with staff travelling to these regions have obligations that go beyond issuing a travel advisory. As legal commentators have previously noted on HRD Australia, if an employee is performing work related to their employment, health and safety duties apply – including when they are overseas.
Returning travellers and monitoring. Given hantavirus's incubation period of up to 42 days, an employee who recently returned from South America and develops flu-like symptoms warrants prompt medical attention and transparent communication with their employer. HR teams should have clear protocols for what happens when a staff member reports potential exposure to a serious infectious disease – including how the organisation handles medical information in compliance with the Privacy Act 1988 and the Australian Privacy Principles. The FWC has previously examined these obligations in detail, as covered in HRD's earlier analysis of medical privacy versus workplace safety.
Rodent management in the physical workplace. While the primary hantavirus risk is environmental or travel-related, it is worth noting that hantavirus antibody-positive rodents have been detected in Australia, even if human infection has not been documented locally. Warehouses, storage facilities, construction sites and rural workplaces where rodents may be present should have clear pest management protocols. The WHO's current guidance emphasises ventilation and rodent exclusion as primary preventive measures.
The pandemic preparedness gap
The MV Hondius outbreak is, in many respects, an amplified version of the kind of infectious disease scenario HR departments should be planning for – even when the probability of local spread is low. The ship's cramped quarters, shared spaces and multinational passenger manifest created the conditions for transmission that no one had anticipated when the voyage departed.
For employers, the parallel is the office. Open-plan workplaces, shared kitchens, hot-desking arrangements and high-density common areas are – as the COVID-19 pandemic demonstrated – capable of accelerating the spread of respiratory illness in ways that can trigger serious operational and legal consequences.
What this outbreak should prompt is a review. Do your current infectious disease protocols reflect the post-COVID environment? Do staff know what to do if they suspect exposure to a novel pathogen? Is your business travel policy updated to flag destinations with active health advisories?
HRD has previously reported on steps employers can take to reduce workplace hazards, including the importance of documented risk assessment using Hazard Identification, Risk Assessment and Control (HIRAC) frameworks. Infectious disease risks should sit within that framework — not as a footnote, but as a standing agenda item reviewed regularly.
The COVID-19 experience showed that organisations with pre-existing work-from-home capability and infectious disease experience were significantly better placed to respond to a novel pathogen than those caught without a plan. That lesson was hard-won. It should not need to be relearned.
What HR should do now
The immediate risk to Australian workplaces from hantavirus is low. That assessment is consistent across the Australian Centre for Disease Control, the Doherty Institute and University of the Sunshine Coast experts who have spoken publicly this week.
But "low risk" is not the same as "no action required." For HR leaders, the following steps are appropriate and proportionate right now:
Review your travel risk framework. Ensure employees travelling to South America – particularly Argentina and Chile – are aware of the current health advisory context and understand basic precautions around rodent exposure.
Update your infectious disease policy. If your organisation's pandemic and infectious disease policy was last reviewed during COVID-19, it may not adequately address the full spectrum of novel pathogens. A well-constructed policy should address sick leave, remote work triggers, communication protocols and privacy obligations in a single coherent document.
