Two new species, Burkholderia multivorans and Burkholderia vietnamiensis, a
nd three genomovars (genomovars I, III and IV) currently constitute the Bur
kholderia cepacia complex. A panel of 30 well-characterized strains represe
ntative of each genomovar and new species was assembled to assist with iden
tification, epidemiological analysis, and virulence studies on this importa
nt group of opportunistic pathogens.