The Andes strain of hantavirus can spread between humans without the very close and prolonged exposure previously required by health guidelines [1, 2].
This shift in understanding changes how public health authorities track and contain outbreaks. If the virus transmits more easily than once believed, standard quarantine and contact tracing protocols may be insufficient to stop a wider spread.
At least seven people were confirmed infected on the MV Hondius cruise ship [3]. The outbreak occurred in international waters, raising concerns about the virus's ability to travel across borders. More than 20 passengers had already left the ship before officials identified the outbreak [4].
The World Health Organization said that hantavirus requires very close and prolonged exposure to spread [2]. However, a study published in 2020 regarding a 2018 outbreak revealed that human-to-human spread occurred beyond those specific parameters [2]. The Philippines Department of Health also said that the Andes hantavirus can spread through contact with an infected person [1].
Health officials monitor the incubation period for hantavirus, which typically lasts from one to eight weeks, with an average of two weeks [5]. Because of this window, passengers who departed the MV Hondius may have been asymptomatic while potentially carrying the virus.
Authorities are now emphasizing the need for updated control measures. The ability of the Andes strain to transmit between people more efficiently than other hantaviruses makes it a distinct public health threat, especially in crowded environments like cruise ships or urban centers.
“The Andes strain of hantavirus can spread between humans without the very close and prolonged exposure previously required.”
The recognition that Andes hantavirus does not require prolonged contact for transmission elevates the pathogen's pandemic potential. While most hantaviruses are zoonotic—meaning they jump from animals to humans—the Andes strain's ability to move efficiently between people necessitates a shift in surveillance from animal reservoirs to human-to-human contact tracing.
