sentence: The first published sequencing studies on the Yersinia genus have focused exclusively on invasive human disease-causing species that included five Yersinia pestis genome sequences ( one of which , strain 91001 , is from the avirulent ' microtus ' biovar ) [ 9-12 ] , two Yersinia pseudotuberculosis [ 13,14 ] and one Yersinia enterocolitica biotype 1B [ 15 ] .