Volume 15, Number 8—August 2009
Bordetella pertussis Strains with Increased Toxin Production Associated with Pertussis Resurgence
|Parameter||ptxP3 frequency, %||Hospitalizations/100,000||Deaths/100,000||Lethality†|
|Increase||33.1||1.41 (1.34–1.49)||10.21 (1.31–79.11)||7.23 (0.93–56.07)|
*ptxP, pertussis toxin promoter. Numbers in parentheses are 95% confidence intervals.
†Lethality = no. of deaths / no. of hospitalizations.
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