<p>The Biotyper 2.1 software with default parameter settings has been used for MSP creation and dendrogram calculation. Spectra of the four investigated <i>Haemophilus</i> species formed distinct clusters. Closest similarity was observed between <i>H. influenzae</i> and <i>H. haemolyticus</i> isolates. (a. U. β=β arbitrary units).</p