American biological weapons - The San Francisco incident

http://www.tanker-enemy.tv/american-biological-weapons-ii.htm

During the XXth century, American and British armies used biological weapons (bacteria and viruses) on the unaware people. Especially by means of aircrafts, they spread any kind of poison in order to study and verify the consequences of biological and chemical elements. In 1950 U.S. Army tested Serratia marcescens, a bacterium which causes pneunomia, on San Francisco unaware citizens: some people died.