• strains
  • We used multilocus variable-number tandem repeat analysis and multiple antigen sequence typing to characterize isolates of Bordetella pertussis strains circulating in Denmark during periods with and without pertussis vaccination coverage. (cdc.gov)
  • Recent outbreaks have received media attention, feeding concerns about the emergence of dangerous new strains with increased virulence or that escape vaccine-induced immunity. (cdc.gov)