
In 2022, CDC researchers found an unexpected pattern. Since 1997, there had been seven cases of infections from Bacillus group bacteria producing the anthrax toxin—all in metalworkers. Six of the seven were welders, hence the term “welder’s anthrax,” with the remaining case in a person working in a foundry grinding metal. Of the six cases where a specific Bacillus species was identified, B. tropicus was the culprit, including in the newly reported case.

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