Assessment of serum anti-Bordetella pertussis antibody titers among medical staff members.

This study comparatively evaluated the titers of the bacterial agglutination (BA) antibody for Bordetella pertussis, anti-pertussis toxin (PT) antibody, and anti-filamentous hemagglutinin (FHA) antibody in the serum of medical staff members. The geometric means of the anti-PT and anti-FHA antibody titers were 5.83 and 17.17 EU/mL, respectively. The positive rates of the BA antibodies against Tohama and Yamaguchi strains (> or = 40x), and anti-PT and anti-FHA antibodies (>10 EU/mL) were 81.3, 72.9, 43.8, and 68.8%, respectively. A high anti-PT antibody titer (>94 EU/mL) was found in 1 staff member, but this individual had no recent respiratory symptoms. The titers of the BA antibody against the Yamaguchi strain were weakly associated with the anti-PT antibody titers, but the BA antibody titer was not useful for predicting anti-PT antibody positivity. The seroprevalence of anti-pertussis antibody among medical staff was heterogeneous, suggesting that this group could be at high risk for pertussis. Judgments made using BA antibody or anti-PA antibody results differ, and thus careful evaluation of anti-pertussis antibody titers is necessary. Prompt and accurate diagnostic tools are crucial for infection control in the hospital setting.