Abstract
We previously proposed that one benefit of early polyclonal antibody secretion after bacterial infection might be the formation of antibodies protective against infection by a second pathogen. In order to analyse this possibility, the polyclonal and anti-phosphorylcholine (PC) plaque-forming cell (PFC) response induced by Staphylococcus aureus Cowan I (SA) was compared with the same responses stimulated by unencapsulated Streptococcus pneumonia strain R36a. S. aureus stimulated significant anti-PC PFCs, despite an inability to detect immunoassay-reactive PC on the surface of SA (present on R36a). The induction of these antibodies appeared very similar to the mechanism for producing polyclonal responses. R36a also stimulated both anti-PC and polyclonal PFCs, but by different means. In summary, our data suggest that each type of bacteria induces polyclonal and anti-PC responses through different mechanisms, and that the polyclonal antibody response stimulated by one group of bacteria can contain antibodies directed towards a second and different genus of bacteria.
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Selected References
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