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Infect Immun. 1973 December; 8(6): 896-900
Copyright © 1974 American Society for Microbiology. All Rights Reserved.

Polysaccharides of the Genus Bacillus Cross-Reactive with the Capsular Polysaccharides of Diplococcus pneumoniae Type III, Haemophilus influenzae Type b, and Neisseria meningitidis Group A

¹ Department of Pathology, Peter Bent Brigham Hospital, Harvard University Medical School, Boston, Massachusetts 02115
Institute of Microbiology, Rutgers University, The State University of New Jersey, New Brunswick, New Jersey 08903
Developmental Immunology Branch, National Institute of Child Health and Human Development, Bethesda, Maryland 20014

ABSTRACT

We studied 174 strains of the genus Bacillus for cross-reacting antigens to the capsular polysaccharides of groups A and C meningococcus, types I and III pneumococcus, and Haemophilus influenzae type b. Cross-reactions were detected by immunodiffusion in agarose gel by using type-specific antisera and confirmed by absorption and inhibition experiments. Of 20 Bacillus pumilis strains, six had an antigen cross-reacting with group A meningococcal polysaccharide. Other cross-reactions included one strain of B. pumilis with H. influenzae type b, one of B. cereus var. mycoides with pneumococcus type III, and one of B. alvei with both type b and SIII polysaccharides. These cross-reacting antigens are polysaccharides of vegetative cells and may be extracellular in location. Because these bacilli have antigens cross-reacting with the virulence factors of pyogenic bacteria, they may, as normal flora, be an antigenic stimulus for "natural" serum anti-capsular antibodies to the type b Haemophilus and group A meningococcus polysaccharides.

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