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“This is the only vaccine in the world that can be given to combat covid-19 right now,” said Jeffrey D. Cirillo, a professor of microbial pathogenesis and immunology at Texas A&M Health Science Center, who is leading a trial of the tuberculosis vaccine, called bacillus Calmette-�ҳ�é������ and known by the shorthand BCG.

At more than 25 universities and clinical centers around the world, researchers have begun clinical trials, primarily in health care workers, to test whether a live tuberculosis vaccine that has been in use for 99 years called the bacillus Calmette-�ҳ�é������, or B.C.G., vaccine, could reduce the risks associated with the coronavirus.

Bacillus Calmette-�ҳ�é������ tuberculosis vaccine that induces a broad innate immune-system response, which has been shown to protect against infection or severe illness with other respiratory pathogens.

The Bacillus Calmette-Guerin vaccine is still widely used in the developing world, where scientists have found that it does more than prevent TB.

To make things worse, currently there is a worldwide shortage of Bacillus Calmette-Guerin, a bacterium used to make the preferred immunotherapy for decreasing bladder cancer recurrence after surgery.