Isolated peptides of the Bacillus anthracis Anthrax Toxin Lethal factor Protein pX01 107, antibodies specific for the peptides and methods of stimulating the immune response of a subject to produce antibodies to the Bacillus anthracis Anthrax Toxin Lethal factor Protein pX01 107 are disclosed. Also disclosed are isolated peptides of the Small Pox Virus Surface Antigen S Precursor Protein, antibodies specific for the peptides and methods of stimulating the immune response of a subject to produce antibodies to the Small Pox Virus Surface Antigen S Precursor Protein.