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Countries with mandatory policies to vaccinate against tuberculosis register fewer coronavirus deaths than countries that don’t have those policies, a new study has found.

The preliminary study posted on medRxiv, a site for unpublished medical research, finds a correlation between countries that require citizens to get the bacillus Calmette-Guerin (BCG) vaccine and those showing fewer number of confirmed cases and deaths from COVID-19. Though only a correlation, clinicians in at least six countries are running trials that involve giving front-line health workers and elderly people the BCG vaccine to see whether it can indeed provide some level of protection against the new coronavirus.

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