Volume 15, Number 8—August 2009
Bordetella pertussis Strains with Increased Toxin Production Associated with Pertussis Resurgence
*ptxP, pertussis toxin promoter. Allele frequencies are given in percentages.
†The following countries represented the continents: Africa: Senegal; Asia: Japan and Australia; Europe: Denmark, Finland, France, Germany, Italy, Sweden; North America: USA; South America: Argentina.
‡Nine ptxP alleles were found in low frequencies: ptxP2, ptxP4, ptxP5, ptxP6, ptxP7, ptxP8, ptxP9, ptxP10, and ptxP11.
§Dutch strains were excluded.
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