CIAO3 and pertussis: A poor correlation is obtained when comparing the SBA titers of B1917 and all the anti-pertussis IgG measured (0.20 for anti-Fim, 0.28 for anti-Prn, 0.42 for anti-PTX and 0.43 for anti-FHA IgG levels in convalescent samples, Figures 4C–F).