Vaccines usually protect you against a single, specific illness. They give the immune system a heads-up about what that invader will look like, so your cells are ready to leap into action.  Some, though, do something a little different.  For instance, researchers noticed during the pandemic that people who received the BCG vaccine against tuberculosis—which is not recommended in the U.S. but is commonly used in countries where the disease is endemic—had extra protection against COVID-19. That

Tag-uri: Coronavirus