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Preliminary study suggests tuberculosis vaccine may be limiting ...

Positivity     50%   
   Negativity   50%
The New York Times
SOURCE: https://medicalxpress.com/news/2020-07-preliminary-tuberculosis-vaccine-limiting-covid-.html
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Summary

1 day ago ... ... be able to provide at least short-term protections against severe COVID-19,
particularly for front-line medical workers or high-risk patients.

As said here by https://medicalxpress.com/news/2020-07-preliminary-tuberculosis-vaccine-limiting-covid-.html