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OBJECTIVE: The novel coronavirus pandemic is ravaging throughout the world It has infected more than 1 2 million people and killed more than 64,000 Frantic research is underway to find prevention and cure Of late, Bacillus Calmette-Guerin (BCG) has been speculated as a possible protection from COVID-19 We sought to investigate the evidence behind the claim MATERIAL AND METHODS: Data were collected regarding the total number of COVID-19 cases per million and total number of COVID-19 deaths per million in various countries The BCG vaccination policies of these countries were also obtained RESULTS: It was seen that the countries with no universal BCG policy had a mean 1272 9 (median 795) cases per million and 80 7 deaths (median 18) per million population On the contrary, the countries with a universal BCG vaccination policy had a mean 131 2 (median 40) cases per million and 4 deaths (median 1) per population The difference is highly significant (P < 0 001) CONCLUSION: The data strongly support the hypothesis that BCG may offer protection from COVID-19 Heterologous protection offered by BCG through production of trained immunity, epigenetic reprogramming of monocytes, non-specific activation of NK cells, and increase of pro-inflammatory cytokines (particularly, tumor necrosis factor [TNF]-alpha and interleukin 1 beta) production may be the mechanism behind its cross- protection against the novel coronavirus
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Indian_Journal_of_Medical_Sciences
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Does the Bacillus Calmette-Guerin vaccine provide protection from COVID-19?
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