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. 1973 Dec;8(6):896–900. doi: 10.1128/iai.8.6.896-900.1973

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

Richard L Myerowitz 1, Ruth E Gordon 2, John B Robbins 3
PMCID: PMC422947  PMID: 4150383

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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Selected References

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