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Hantavirus (specifically the pulmonary syndrome form) is deadlier per case, with a fatality rate around 38-40%. COVID-19's is roughly 1%.
That said, hantavirus spreads mainly from rodents and rarely person-to-person, so outbreaks stay small—like the current cruise ship cluster. COVID spread globally and killed millions due to high transmissibility.
No pandemic-level threat from hantavirus right now.
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