Abstract
The distribution of serotypes among strains of Neisseria meningitidis responsible for a marked increase of meningitis cases in the Hamilton area, Ontario, in 1978 and 1979 was determined. Twenty-six serogroup B and two serogroup W135 strains isolated from cerebrospinal fluid, blood, and skin of 28 patients were serotyped by agar gel double diffusion. Twenty-one (81%) of the group B strains were serotype 2b as judged by the formation of characteristic serotype precipitin bands with the specific anti-2996 (type 2b) serum. Fourteen of the serotype 2b strains also reacted with anti-77252 serum, which suggested that one strain or several closely related strains were mainly responsible for the increase in meningitis during the 2-year period. Examination of the outer membrane complexes (OMC) of the strains by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate (SDS-PAGE) revealed that all 21 of the serotype 2b strains contained the class 2 protein (molecular weight 41500) which is known to be the site of the serotype 2b determinant. Further characterization of the serotype 2b, 77252 strains by enzyme-linked immunosorbent assays (ELISA) and SDS-PAGE suggested that the 77252 determinant was present in the class ...Continue Reading
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