São Paulo hantavirus case fatality 51% since 2007; rapid progression demands urgent response

São Paulo state reports 199 hantavirus cases and 101 deaths since 2007, a 51% case fatality rate. The disease progresses rapidly, requiring immediate investigation of suspected cases. This is a long-term epidemiological pattern, not a new outbreak, but the high lethality underscores ongoing public-health risk in the region.

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