["Biological", but fatal. Letters as potential biological weapons].
Schroeder
I
I
ngo.schroeder@springer.de
D001424:Bacterial Infections / Q000401:mortality / Q000635:transmission*; D001694:Biological Warfare; D006801:Humans; D011177:Postal Service; D023481:Terrorism; D014777:Virus Diseases / Q000401:mortality / Q000635:transmission*