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The Journal of Medical Microbiology, Vol 48, Issue 4 389-394, Copyright © 1999 by Society for General Microbiology

JOURNAL ARTICLE

An investigation into the influences of species and biotype on the type of IgA1 protease produced by isolates of Haemophilus

B. W. Senior and C. L. Ip
Department of Medical Microbiology, Dundee University Medical School, Ninewells Hospital.

A total of 59 isolates of different Haemophilus spp., mostly from clinical specimens, was characterised, biotyped and examined for production of type 1 or type 2 IgA1 protease. IgA1 protease activity was not found in any isolate of a species with no or low virulence for man including H. parainfluenzae, H. haemolyticus, H. aphrophilus, H. paraphrophilus, H. segnis, H. paraphrohaemolyticus and H. haemoglobinophilus. IgA1 protease was produced by all isolates of H. influenzae and H. aegyptius and by some isolates of H. parahaemolyticus. The type of IgA1 protease appeared to be independent of the biotype of the isolate in H. influenzae. For the first time some isolates of H. aegyptius were found that produced type 2 IgA1 protease. IgA1 protease production in H. parahaemolyticus may be associated with the virulence of the isolate.


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M. M. Fernaays, A. J. Lesse, X. Cai, and T. F. Murphy
Characterization of igaB, a Second Immunoglobulin A1 Protease Gene in Nontypeable Haemophilus influenzae.
Infect. Immun., October 1, 2006; 74(10): 5860 - 5870.
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