Viral infections come and go countless times over our lives. Some, like mononucleosis, might knock you flat for weeks, while others never produce any symptoms at all. And some may impact your immune system in subtle ways for years after the infection.
Soon, it could be possible to get a full history of every viral infection you’ve ever had, using just a drop of blood. Researchers have developed a blood test that detects the remnants of more than 1,000 strains of 206 virus species. The tes