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Infection and Immunity, April 1999, p. 1878-1886, Vol. 67, No. 4
Departments of Microbiology and
Immunology1 and
Pediatrics,2 Georgetown University
Medical Center, Washington, D.C. 20007, and Department of
Oral Biology, University of Manitoba, Winnipeg, Manitoba R3E OW2,
Canada3
Received 7 August 1998/Returned for modification 14 October
1998/Accepted 12 January 1999
Secretory immunoglobulin A (SIgA) antibodies reactive with the
pioneer oral streptococci Streptococcus mitis biovar 1 and Streptococcus oralis, the late oral colonizer
Streptococcus mutans, and the pioneer enteric bacterium
Enterococcus faecalis in saliva samples from 10 human
infants from birth to age 2 years were analyzed. Low levels of salivary
SIgA1 and SIgA2 antibodies reactive with whole cells of all four
species were detected within the first month after birth, even though
S. mutans and E. faecalis were not recovered
from the mouths of the infants during the study period. Although there
was a fivefold increase in the concentration of SIgA between birth and
age 2 years, there were no differences between the concentrations of
SIgA1 and SIgA2 antibodies reactive with the four species over this
time period. When the concentrations of SIgA1 and SIgA2 antibodies
reactive with all four species were normalized to the concentrations of
SIgA1 and SIgA2 in saliva, SIgA1 and SIgA2 antibodies reactive with
these bacteria showed a significant decrease from birth to 2 years of
age. Adsorption of each infant's saliva with cells of one species
produced a dramatic reduction of antibodies recognizing the other three
species. Sequential adsorption of saliva samples removed all SIgA
antibody to the bacteria, indicating that the SIgA antibodies were
directed to antigens shared by all four species. The induction by the
host of a limited immune response to common antigens that are likely not involved in adherence may be among the mechanisms that commensal streptococci employ to persist in the oral cavity.
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Humoral Immunity to Commensal Oral Bacteria in Human Infants:
Salivary Secretory Immunoglobulin A Antibodies Reactive with
Streptococcus mitis biovar 1, Streptococcus
oralis, Streptococcus mutans, and
Enterococcus faecalis during the First Two Years
of Life
*
Corresponding author. Mailing address: Med Dent Bldg.,
Rm. S.E. 308A, 3900 Reservoir Rd., N.W., Washington, DC 20007. Phone: (202) 687-1817. Fax: (202) 687-4973. E-mail:
colem{at}gunet.georgetown.edu.
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