Characterization of Haemophilus parainfluenzae Strains with Low-Mr or Ladder-like Lipopolysaccharides

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Abstract
Twenty-five Haemophilus parainfluenzae strains were characterized for lipopolysaccharide (LPS) profiles, outer membrane protein profiles, serum sensitivity, plasmid profiles and DNA homology. Seventeen strains produced low-Mr LPS that did not contain O-sidechains, while the remaining eight strains contained ladder-like LPS suggestive of O-repeated units. This is the first time in the genus Haemophilus that LPS could not be distinguished from each other in outer membrane protein profiles or the other characteristics examined.