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- 1Secret Cold War bioweapons test exposed millions in Bay Area●The secret Cold War bioweapons test that exposed millions in the Bay Area
A newly resurfaced account details the US Army's secret Cold War experiments in which bacteria were sprayed over the San Francisco Bay Area in the 1950s to test how biological agents could spread in a city. The operation, known as Serratia, exposed millions of residents without their knowledge and is drawing renewed attention and criticism online.