Nested PCR for distinguishing Haemophilus haemolyticus from Haemophilus influenzae and Cloning and expression of fragmented Moraxella catarrhalis IgD-binding protein in E. coli

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ABSTRACTNontypable Haemophilus influenzae is a common cause of otitis, sinusitis and conjunctivitis. It is the most common bacterial pathogen associated with chronic obstructive pulmonary disease (COPD). Studies have shown that nonpathogenic Haemophilus haemolyticus are often mistaken for Haemophilus influenzae due to an absent hemolytic reaction on blood agar. Distinguishing H. haemolyticus from H. influenzae is important to prevent unnecessary antibiotic use, and to understand the role of H. influenzae in clinical infections. In this study, PCR-primers for amplifying 16S rDNA sequences were used to set up a method for distinguishing H. haemolyticus from H. influenzae. The aim was to use the method for analyzing apparent H. influenzae strains, to investigate if some strains were in fact H. haemolyticus. However, because of problems with unspecific primerannealing,no conclusions could be drawn regarding misclassification of H. haemolyticus.Moraxella catarrhalis is the second most common bacterial pathogen associated with COPD. It also causes otitis and sinusitis. An important virulence factor of M. catarrhalis is the outer membrane protein Moraxella catarrhalis IgD-binding protein (MID). One part of the protein; MID764-913 , has been shown to function as an adhesin, and this part has been fragmented to further investigate its adhesive properties. The aim of this second, independent study, was to exp...