VIRAL EVOLUTION

The story of the porcine epidemic diarrhea virus, or PEDV, is a reminder that even strong vaccines can lose their edge when a pathogen keeps evolving. This virus, which lives in pig guts, began as a regional problem in the 1970s but now spreads worldwide. Its ability to change its genetic makeup, su

COVID-19 is still around, but it's not the same as it was at the start. It's become more like a common illness that keeps popping up in different places. Even with vaccines and health rules, the virus changes, people's immunity shifts, and the environment plays a role in how it spreads and how sick