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J Clin Microbiol. 1975 February; 1(2): 188-191

Rapid identification of group B streptococci by counterimmunoelectrophoresis.

H R Hill, M E Riter, S K Menge, D R Johnson and J M Matsen

ABSTRACT

Beta-hemolytic streptococcal isolates have been examined by counterimmunoelectrophoresis (CIE) with group B antiserum to determine whether this techinque is of value in the rapid identification of group B strains. Ninety stock cultures and 100 clinical isolates of beta-hemolytic streptococci including representatives of groups A, D, C, G, and B were inoculated into Todd-Hewitt broth; after incubation at 37 C for 1, 2, 3, and 4 h, aliquots of the whole broth cultures were removed and tested by CIE. Antigen was not regularly detected in the 1-, 2-, and 3-h samples, but after 4 h all 126 group B streptococcal strains identified by the capillary precipitin reaction gave CIE precipitin bands with group B antiserum. None of the 58 non-group B strains gave precipitin reactions with this antiserum. Cerebrospinal fluid from an infant with group B streptococcal meningitis and peritoneal fluid from a patient with group B streptococcal peritonitis had free group B antigen detected by the CIE technique. CIE of broth cultures and direct body fluids appears to be a rapid and sensitive method for the identification of group B streptococcal strains.

J Clin Microbiol. 1975 February; 1(2): 188-191




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