Important Facts Before Commenting on the Current Hantavirus Situation. Preliminary Genomic Sequencing Data Revealed
Nikhil Prasad Fact checked by:Thailand Medical News Team May 12, 2026 33 minutes ago
Medical News: Discussions of the ongoing hantavirus cluster should be grounded in verified scientific and epidemiological data rather than speculation, as many public comments on both sides of the spectrum lack essential context, possibly due to ignorance.
No one should be compalcent about the current hantavirus situation as there is so much still not known
and the virus itself is still evolving
This
Medical News report was quickly put together to rectify some fallacies being spread on social media platforms such as hantavirus are only spread via direct contact with rodents or that there we should all be simply complacent as the virus is not evolving and posses a very low risk. There are so many unknowns still and even the results from the initial genomic sequencing are being debated among virologists and experts and some more new data has appeared in the last 6 hours that have yet to be made public.
Hantaviruses include multiple distinct strains, such as Hantaan virus, Andes virus (ANDV), Seoul virus, Puumala virus, Dobrava-Belgrade virus, and Sin Nombre virus, among others. The majority are transmitted zoonotically, primarily through inhalation of aerosolized virus in rodent urine, droppings, or saliva, or via direct contact with infected rodents or their excreta.
https://cepi.net/hantaviruses
https://www.cdc.gov/hantavirus/about/index.html
https://www.who.int/news-room/fact-sheets/detail/hantavirus
However, Andes virus stands out as the only
hantavirus with documented, though typically limited, person-to-person transmission, which generally requires close, prolonged contact (e.g., household or caregiving settings) and exposure to body fluids. So yes, transmissions can occur with those already infected, to other humans without any rodents involved
There is not one but various sublineages and genetic variants of Andes virus that have been identified. Certain clades (e.g., those linked to outbreaks in Argentina) carry specific amino acid substitutions—such as Q40R and N47S in the nonstructural protein (NSs) and T641I in the glycoprotein precursor (Gc)—that have been associated with enhanced potential for human-to-human transmission in prior events.
https://www.biorxiv.org/content/10.1101/2023.01.18.524667v1
In the current cruise ship-associated cluster (involving the MV Hondius and Andes virus), the World Health Organization has coordinated genomic sequencing through multiple reference laboratories, including the National Institute for Communicable Diseases (NICD) in South Africa and Geneva University Hospitals in Switzerland, w
ith additional support from labs in Senegal, the United Kingdom, the Netherlands, and Argentina. Preliminary full-genome sequences (including from the Swiss laboratory) show high nucleotide identity (>98%) to previously characterized Andes virus strains from human cases in Argentina (e.g., 1997 and 2018 outbreaks).
https://virological.org/t/preliminary-analysis-of-orthohantavirus-andesense-virus-sequences-from-a-cruise-ship-related-cluster-may-2026/1029
Only minor synonymous single-nucleotide polymorphisms have been noted, with no evidence of novel mutations indicating new adaptations for transmissibility or virulence. The data are consistent with an initial zoonotic spillover followed by limited secondary human-to-human spread.
As RNA viruses, hantaviruses can exhibit relatively high short-term molecular evolutionary rates (on the order of 10⁻² to 10⁻⁴ substitutions per site per year in some analyses), which may result in observable genetic variation when the virus enters new hosts or laboratory environments.
https://academic.oup.com/mbe/article/25/7/1488/1047584
Latest samples(in the last 48 hours) send to labs for genomic sequencing are showing some new interesting data that have yet to be made public yet
The incubation period for Andes virus infection (time from exposure to symptom onset) is typically 4–42 days (median around 18 days in some studies), though sources note a possible maximum of up to 8 weeks in rare cases. This extended window underscores the importance of prolonged monitoring for exposed individuals.
https://www.cdc.gov/hantavirus/about/andesvirus.html
https://www.chp.gov.hk/en/healthtopics/content/24/3057.html
Documented person-to-person transmission of Andes virus has primarily occurred during the prodromal (early symptomatic) phase, when viral loads are often elevated. While pre-symptomatic transmission (1–2 days before overt symptoms) cannot be entirely ruled out in close-contact scenarios, current evidence indicates that fully asymptomatic individuals do not play a significant role in spread. Transmission routes in human clusters involve close physical contact and body fluids; fomites or aerosols may contribute in enclosed, prolonged-exposure settings but require specific conditions (e.g., direct proximity to an infectious individual).
https://www.nejm.org/doi/full/10.1056/NEJMoa2009040
These facts highlight that while Andes virus poses a notable contained risk in specific close-contact scenarios, risk of sustained community transmission or pandemic potential cannot yet be ruled out as the virus could still be evolving in those infected.
For more new updates on the current hantavirus situation, keep on logging to
Thailand Medical News.
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https://www.thailandmedical.news/articles/hantavirus-news
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