Sebastien Roblin
During World War II, Japan infamously deployed biological weapons in attacks that infected and killed thousands of Chinese citizen. Less well known, however, is the fact that Japanese strategists also planned to deploy plague bombs against U.S. forces on at least four separate occasions—each only narrowly averted by circumstance. The last such attack, known as Operations Cherry Blossoms at Night, envisioned bombing San Diego with plague-infected fleas.
http://nationalinterest.org/blog/the-buzz/fact-japan-wanted-drop-plague-bombs-america-using-aircraft-21555
