Maybe you’ve never heard of the Epstein-Barr virus. But it knows all about you. Chances are, it’s living inside you right now. About 95% of American adults are infected sometime in their lives. And once infected, the virus stays with you. Most viruses, such as influenza, just come and go. A healthy immune system attacks them, kills them, and prevents them from sickening you again. Epstein-Barr and its cousins, including the viruses that cause chickenpox and herpes, can hibernate inside your cells for decades. This viral family has “evolved with us for millions of years,” said Blossom Damania, …