As Canada’s flu season collides with record strep A cases and ongoing COVID-19 concerns, a new study is shedding light on our understanding of respiratory immune responses. Scholars from the Research Institute of the McGill University Health Centre (RI-MUHC) have discovered a surprising facet about a century-old vaccine for tuberculosis, Bacillus Calmette Guérin (BCG).

The study, published in the journal Nature Immunology, uncovered a previously unknown mechanism that extends the vaccine’s shield to combat influenza A virus—the most prevalent flu strain.

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