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BIOTYPES OF CAPSULATED AND NON‐CAPSULATED HAEMOPHILUS INFLUENZAE. Correlation between Biotypes andβ‐Lactamase Production
Author(s) -
Kamme Carl
Publication year - 1980
Publication title -
acta pathologica microbiologica scandinavica section b microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.909
H-Index - 88
eISSN - 1600-0463
pISSN - 0304-131X
DOI - 10.1111/j.1699-0463.1980.tb02638.x
Subject(s) - haemophilus influenzae , microbiology and biotechnology , biology , antibiotics
396 Haemophilus influenzae strains were biotyped according to Kilian. 393 of the strains were assigned to biotypes I to V, while 3 strains remained unclassified. Eighty‐nine per cent of the capsulated strains produced both urease and ornithine decarboxylase, biotypes I or IV, while 95 per cent of the non‐capsulated strains produced only one of the enzymes, biotypes II, III, or V. Of consecutive strains from the upper respiratory tract, the incidence ofβ‐lactamase‐positive strains was higher among capsulated than among non‐capsulated strains (p< 0.025). None of 133 non‐capsulatedβ‐lactamase‐positive strains produced both urease and ornithine decarboxylase, in contrast to 15 out of 147 non‐capsulatedβ‐lactamase‐negative strains (p< 0.001). The type e strains were all of biotype IV and 3 of 7 consecutive strains wereβ‐lactamase‐positive.