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Detection of group B streptococcal antigen in early-onset and late-onset group B streptococcal disease with the Wellcogen Strep B latex agglutination test.

ABSTRACT

The Wellcogen Strep B latex agglutination test (Wellcome Diagnostics, Dartford, England) was evaluated as a method of detecting group B streptococcal antigen in urine, cerebrospinal fluid, and serum from neonates with early-onset (less than or equal to 7 days of age) and late-onset group B streptococcal disease. Urine was the best source of antigen, which was detected in 100% of six neonates with early-onset group B streptococcal disease who had urine available in the first 12 h of illness and in 88% of 17 group B streptococcus-infected neonates with urine available in the first 48 h of illness. Antigen was not detected in any samples from patients without group B streptococcal disease except in the urine of one patient with Proteus mirabilis meningitis. The Wellcogen Strep B latex test of the lot tested compares favorably with a noncommercially available latex agglutination test.

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