Assay of SIgA antibodies reactive with S. mitis biovar 1, S. oralis, S. mutans, and E. faecalis in aliquots of saliva from the cohort of 10 infants after adsorption with whole cells of these four species. Antibody in unabsorbed saliva was set to 100%. ELISA was run on wells coated with S. mitis biovar 1 (A), S. oralis (B), S. mutans (C), or E. faecalis (D).