Pneumococcal carriage and otitis media induce salivary antibodies to pneumococcal surface adhesin a, pneumolysin, and pneumococcal surface protein a in children.
Local antibodies probably contribute to defense against Streptococcus pneumoniae. This study examined whether pneumococcal carriage and acute otitis media (AOM) induce mucosal antibodies to potential vaccine candidates pneumococcal surface adhesin A (PsaA), pneumolysin (Ply), and pneumococcal surface protein A (PspA). IgA to all 3 proteins was detected by EIA in saliva of 329 children at ages 6, 12, 18, and 24 months and of 17 adults. A higher proportion of IgA-positive samples and higher antibody concentrations were seen in children with pneumococci-positive cultures of nasopharyngeal samples or middle ear fluid than in children with all cultures negative for pneumococci. The strong correlation between IgA and the presence of the secretory component suggests that the IgA was secretory. The findings indicate that pneumococcal carriage and AOM induce local production of anti-PsaA, anti-Ply, and anti-PspA antibodies early in life.
Department of Vaccines, National Public Health Institute, Helsinki, Finland.
B
B
Simell
M
M
Korkeila
H
H
Pursiainen
T M
TM
Kilpi
H
H
Käyhty
D000208:Acute Disease; D018829:Adhesins, Bacterial; D000328:Adult; D000367:Age Factors; D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D000942:Antigens, Bacterial / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology; D002352:Carrier Proteins / Q000276:immunology; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007071:Immunoglobulin A, Secretory / Q000096:biosynthesis*; D007223:Infant; D008074:Lipoproteins / Q000276:immunology; D008297:Male; D026901:Membrane Transport Proteins; D010033:Otitis Media / Q000276:immunology* / Q000382:microbiology; D011008:Pneumococcal Infections / Q000276:immunology* / Q000382:microbiology; D012463:Saliva / Q000276:immunology*; D012635:Secretory Component / Q000096:biosynthesis; D013296:Streptococcus pneumoniae / Q000276:immunology* / Q000302:isolation & purification; D013301:Streptolysins / Q000276:immunology
D018829:Adhesins, Bacterial; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D002352:Carrier Proteins; D007071:Immunoglobulin A, Secretory; D008074:Lipoproteins; D026901:Membrane Transport Proteins; C085000:PsaA protein, Streptococcus; D012635:Secretory Component; D013301:Streptolysins; C032290:plY protein, Streptococcus pneumoniae; C051592:pneumococcal surface protein A