Human-to-Human Transmission

After isolation and quarantine were implemented in the 2019 Argentina outbreak, R₀ dropped below 1.0, arresting transmission. In the 2018–2019 Argentina outbreak, the basic reproductive number R₀ reached 2.12 before control measures — above the threshold for self-sustaining spread. In the 2011 southern Chile outbreak, two of the secondary infections occurred in healthcare workers, demonstrating nosocomial transmission without any invasive procedures. The mutation sites affect the virus's ability to bind to human respiratory receptors. The identified mutation sites affect the virus's ability to bind human respiratory receptors. The specific mutations directly influence the potential for human-to-human transmissibility. Sex partners of Andes hantavirus patients have a 10-fold higher infection risk compared to other household contacts. The identified mutation sites influence the virus's potential for human-to-human transmissibility. Overall, 3.4% of all household contacts of Andes hantavirus patients developed hantavirus cardiopulmonary syndrome. The presence of the mutations in combination prompted concern and requests for expert review. The mutations raised concerns among virologis…