A recent study suggests that the Bacillus Calmette-Guérin (BCG) vaccine, typically used to prevent tuberculosis, may also reduce the risk of Alzheimer's disease and related dementias. The study followed 6,467 individuals, over 15 years post their diagnosis with non-muscle-invasive bladder cancer. Findings revealed patients who received the BCG vaccine had a 20% lower risk of Alzheimer’s disease and related dementias, and a 25% reduced risk of death.