Five Australians and one New Zealander are heading into quarantine near Perth after potential exposure to Andes virus aboard a cruise ship, but health experts say this rodent-borne disease lacks the characteristics to become the next pandemic.

Nine Cases Linked to Antarctic Cruise

European health authorities reported nine cases connected to the MV Hondius cruise ship as of May 11, including seven confirmed and two probable infections. Three deaths have been confirmed. The passengers will quarantine at the Centre for National Resilience near RAAF Base Pearce in Western Australia, with testing conducted by Melbourne’s Doherty Institute using PCR and antibody methods.

How Andes Virus Spreads Differently

Andes virus belongs to the hantavirus family, typically carried by rodents. People usually contract it by breathing contaminated rodent droppings or urine particles. While most hantaviruses cannot spread between humans, Andes virus is the exception. However, human-to-human transmission remains uncommon and requires prolonged close contact in poorly ventilated spaces. This differs dramatically from COVID, which spread efficiently through the air even before symptoms appeared. Early COVID data showed each infected person passed the virus to roughly two or more others in unexposed populations.

Symptoms and Monitoring Period

Early Andes virus symptoms resemble common illnesses—fever, headache, muscle aches, nausea, and fatigue. Some patients develop hantavirus pulmonary syndrome, a life-threatening breathing condition. The World Health Organization recommends monitoring for symptoms up to 42 days after exposure, reflecting the maximum incubation period. Australian authorities announced returning passengers will spend three weeks in initial quarantine with continued monitoring afterward.

Why This Won’t Become a Pandemic

The transmission requirements for Andes virus make widespread outbreaks unlikely. The virus needs symptomatic people in crowded, poorly ventilated environments with sustained close contact—conditions that existed on the cruise ship but are rare otherwise. Testing challenges exist because early negative results may not be definitive if the virus is still incubating. The long incubation period reflects how Andes virus progresses differently compared to respiratory viruses. Authorities emphasize cautious responses are appropriate, but this outbreak remains contained with no pandemic potential.