Hantavirus in the Americas 2025: More than a quarter of the cases were fatal Posted on January 8, 2026 (January 8, 2026) by Connor Johnson Outbreak News Today December 31, 2025 In the Western Hemisphere, the Pan American Health Organization (PAHO) reported a total of 229 hantavirus cases and 59 deaths in eight countries in the Americas Region, mainly in the Southern Cone in 2025- Argentina, Brazil, Bolivia, Chile, Panama, Paraguay, the United States of America, and Uruguay. This is a case fatality rate of nearly 26 percent. Read Article