title: Quantitation of blood lymphocytes secreting antibodies to pneumococcal polysaccharides after in vivo antigenic stimulation.
abstract: An indirect plaque-forming cell assay detecting B cells secreting IgM, IgG and IgA antibodies against pneumococcal polysaccharides (PPS) is described. The numbers of anti-PPS-secreting cells (SC) and Ig-SC in the blood of normal persons immunized with a polyvalent PPS vaccine were quantitated. Anti-PPS-SC were recorded from the fourth to the twelfth post-vaccination day, and the maximum number was found between days 6 and 9. Quantitatively IgA anti-PPS-SC outnumbered the IgM and IgG anti-PPS-SC. Concomitant with the increase in the numbers of antibody-SC an increase in polyclonally activated IgM-, IgG- and IgA-SC was recorded. The specific anti-PPS-antibody-SC constituted 20-80% of the total numbers of Ig-SC from the sixth to the ninth post-vaccination day.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis*; D000921:Antibody-Producing Cells / Q000166:cytology*; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology*; D002452:Cell Count; D006462:Hemolytic Plaque Technique; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D022242:Pneumococcal Vaccines; D012756:Sheep; D014611:Vaccination
chemical_list: D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D022242:Pneumococcal Vaccines