Mode of Delivery and Other Maternal Factors Influence the Acquisition of Streptococcus mutans in Infants
Y. Li1,*,
P.W. Caufield2,
A.P. Dasanayake3,
H.W. Wiener4, and
S.H. Vermund4
1 Department of Basic Science and Craniofacial Biology,
2 Division of Diagnostics, Infectious Disease and Health Promotion, and
3 Department of Epidemiology and Health Promotion, New York University College of Dentistry, 345 East 24th Street, New York, NY 10010-4086, USA; and
4 Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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Figure 1. A schematic illustration of the overall study design. (A) The mother-child cohort for determination of S. mutans acquisition in the children (N = 156). 3T = 3rd trimester; DL = delivery. (B) A sub-set mother-child cohort for comparison of the fidelity of S. mutans transmission (N = 50).
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Figure 2. Comparison of survival experience suggests that children who were vaginally delivered (N = 127) experienced significantly delayed acquisition of S. mutans compared with the children who were delivered by Caesarean section (N = 29) (p = 0.039). The x-axis is the infant’s age; the y-axis is the probability that children were S. mutans-free (survival) at a given age. Since all children were initially S. mutans-free at birth (100% survival), the y value on the graph starts at 1. On average, children delivered by Caesarean section acquired S. mutans 11.7 mos earlier than did vaginally delivered infants (Wilcoxon statistic; p = 0.039).
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