TY - GEN AU - Cassiday,P AU - Sanden,G AU - Heuvelman,K AU - Mooi,F AU - Bisgard,K M AU - Popovic,T TI - Polymorphism in Bordetella pertussis pertactin and pertussis toxin virulence factors in the United States, 1935-1999 SN - 0022-1899 PY - 2000///1201 KW - Alleles KW - Bacterial Outer Membrane Proteins KW - genetics KW - Bordetella pertussis KW - Electrophoresis, Gel, Pulsed-Field KW - Pertussis Toxin KW - Phylogeny KW - Polymorphism, Genetic KW - Time Factors KW - Vaccination KW - Virulence Factors, Bordetella N1 - Publication Type: Journal Article UR - https://doi.org/10.1086/315881 ER -