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Antigenic relationship between Escherichia coli and Neisseria meningitidis.

Escherichia coli was isolated from the spinal fluid of an infant 1 month of age. The child died later of meningitis. In the hospital laboratory where it was isolated, the strain was identified originally as a meningococcus of serogroup B because it was agglutinated by antiserum for that microorganism. This reaction appeared to confirm the results of examination of the spinal fluid by means of fluorescent antibody techniques that had also indicated the presence of meningococci of serogroup B. Later it was recognized that the isolant was E. coli rather than Neisseria, and it was sent to the Enteric Bacteriology Laboratories for serotyping. The strain was identified as E. coli 07:K1(L): NM, and the relationship to Neisseria meningitidis was investigated. The biochemical and serologic methods employed were similar to those described by Ewing et al.1