Summary of the MALDI Biotyper queries with the reference spectrum set. The three panels summarize the score-oriented hit lists that the thirty-four strains of the custom reference set produced when queried against the reference spectrum set plus all representatives of the Burkholderia genus present in the MALDI Biotyper reference database. The three panels represent queries of B. mallei (A), B. pseudomallei (B) and other members of the B. genus (C). Filled circles, squares and open circles indicate scores produced by database entries representing B. mallei, B. pseudomallei or any of the other species in the reference database. Note that for all samples the highest ranking hit represents a member of the respective Burkholderia species.