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2Japan halted exports to other countries for fear that agar supported their development of biowarfare weapons. A few years before, Nazi Germany allegedly tested the efficacy of biowarfare attacks with another curious microbe, Serratia marcescens, dubbed “the miracle bacterium.” According to a much-talked about report by investigative journalist Henry Wickham Steed titled “Aerial Warfare: Secret German Plans” members of a secret Luft-Gas-Angriff (Air Gas Attack) Department spread the S. marcescens in the subterranean train networks of Paris and London and measured its reach armed with Petri dishes and agar plates.