TABLE 1 

Geographic origin and period of isolation of B. pertussis strains used in this study

ContinentCountryNo. of strainsIsolation periodIntroduction of vaccination
AfricaKenya1719751980s
Senegal41990-19931980s
AsiaChina21957Early 1960s
Hong Kong52002-20061950s
Japan171988-20071950s
Taiwan231992-20071954
AustraliaAustralia371974-20071953
EuropeDenmark91962-20071961
Finland161953-20061952
France111993-20071959
Italy151994-19951995
Netherlands601949-20101953
Poland161963-20001960
Russia22001-20021956-1959
Sweden231956-20061953
United Kingdom201920-20081957
North AmericaCanada171994-20051943
USA361935-20051940s
South AmericaArgentina131969-20081970s
Total3431920-2010