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The Bandim Health Project, based in Guinea-Bissau, West Africa, has conducted extensive research on the non-specific effects of vaccines. They have found that some vaccines may have broader effects on overall health beyond their intended purpose of preventing specific diseases. For instance, some studies suggest that certain live vaccines, like the measles and BCG vaccines, might be associated with reduced overall mortality in children, potentially due to boosting the immune system's general responsiveness. However, these findings have been debated, and more research is needed to fully understand and verify these effects.