Abstract
The binding of monoclonal and polyclonal IgG antibodies specific to the capsular polysaccharide of Neisseria meningitidis group B and E. coli K1 was tested to the cross-reacting polysialosyl structures previously shown to be present in the brain of infant rats ( Lancet 1983; ii: 355–357). Strong immunofluorescence was obtained after in vitro incubation of the brains of 1 to 13 days old rats with the antibodies whereas the brains of adult rats remained negative. The number of antibody-binding structures decreased as a function of age, being highest at the age of 1 to 5 days. However, when the same antibodies were injected intraperitoneally into the infant rat, or into the mother rat 2 days before parturition, no binding of antibodies to the infant rat brain tissue was observed.
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