The hantavirus sweeping through the MV Hondius passenger roster has already killed three and sickened at least ten others. We know the virus shows up in saliva, breast milk, and semen. We do not know how long it stays infectious after that. It is a mystery that WHO officials are scrambling to solve.
Maria Van Kerkhove runs the WHO’s unit for emerging diseases. She told reporters Friday that the goal is mapping the virus’s life cycle in humans. There are no treatments. Nothing to cure it. Just surveillance.
“We look at regular sampling of people in quarantine,” she said. “One question is whether they are infected. The second, more difficult one, is whether they are infectious.”
RNA lingers. That is the trap. A Swiss man caught the Andes strain of hantavirus during a trip from Ecuador to Chile. He went home in 2016. Symptoms appeared. Tests confirmed it. Six years later? Doctors still found traces of viral RNA in his semen.
Does that mean he is contagious? No. David Safronetz leads special pathogens research for the Public Health Agency of Canada, and he says presence does not equal power.
The virus might be dead inside the immune cells. We are just detecting the genomic debris.
Sexual transmission? Theoretically possible. The data is slim. Past outbreaks of Andes hantavirus suggest you need sustained, close contact to pass it on—like living in the same cramped room. The cruise ship outbreak complicates this picture. Some suggest aerosolized saliva is the real vector here. High viral loads flying through the air. Not skin-to-skin intimacy.
Steven Bradfute is an immunologist at the University ofNew Mexico. He notes that some body sites, like the eyes or reproductive fluids, are “immune privileged.” The immune system doesn’t clear them as aggressively. It creates hiding spots for pathogens.
Or at least it does for the RNA.
Does the pathogen remain viable? We don’t know. For every virus, the rules differ. If someone tests positive for hantavirus RNA now, additional blood work can clarify if the virus is actually alive and kicking. So far, zero documented cases exist of people getting infected by patients discharged after recovering.
The public is safe. That is the official line. Safronetz agrees. Every person linked to the Hondius —symptomatic or not—is under strict monitoring. Many remain in quarantine for up to 42 days post-exposure.
The window of contagion likely closes long before that mark.
Take a sample at day forty-five. If the patient tests negative? The chance they were ever truly exposed drops to almost nothing. The virus would have declared its presence by then. At least that is the consensus born of thirty years of epidemiology.
But the RNA persists. Years later. In semen. It haunts the tests. It confuses the picture.
We wait for the next wave to clarify the rules.
