A new study quantifies a critical timeframe in BCG vaccine’s potential neuroprotective action: sustained changes in brain immune markers persist for 12 months following vaccination, according to research published in Communications Medicine by Mass General Brigham investigators. This extended duration marks a significant finding, as it suggests that BCG-induced immune remodeling creates a prolonged window for potential neurodegeneration protection. The mechanism operates through trained immunity, a non-specific immune memory phenomenon distinct from traditional adaptive immunity. Circulating immune cells activated by intradermal BCG injection cross the blood-brain barrier within weeks, progressively shifting microglial phenotype toward a potentially protective state. The 12-month persistence of biomarker changes indicates durable immune remodeling rather than transient activation, opening new avenues for understanding how systemic vaccination might influence long-term neuroinflammatory pathways. Read the full article on GMJ Newsroom.
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