New Outbreak 2025 Calendar. One influenza virus is causing great concern right now and is teetering on the edge of being a serious problem in 2025. One influenza virus is causing great concern right now and is teetering on the edge of being a serious problem in 2025.

From familiar viruses making a comeback to potential new threats, several factors are aligning. Which infectious disease is likely to be the biggest emerging problem in 2025?