1. Pertussis vaccines: W.H.O position paper;WHO;Wkly. Epidemiol. Rec.,1999
2. Trends in pertussis among infants in the United States, 1980–1999;Tanaka;J. Am. Med. Assoc.,2003
3. WHO (2000) Pertussis surveillance. In Global meeting; October 16–18 2000, World Health Organisation
4. Summary of notifiable diseases – United States, 2002;Groseclose;MMWR Morb. Mortal. Wkly. Rep.,2004
5. Is Bordetella pertussis changing?;Guiso;ASM News,2005