Stochastic humoral immunity to Bacillus anthracis protective antigen: Identification of anti-peptide IgG correlating with seroconversion to Lethal Toxin neutralization

► Sequential IgG epitopes of Bacillus anthracis Protective Antigen (PA) in A/J mice. ► Stochastic humoral immune response to PA vaccination in inbred mice. ► IgG binding to six PA decapeptides correlates with Lethal Toxin neutralization.