Table 4.

Concentrations (μg/ml) of salivary SIgA in infant saliva bound to fractions of S. mitis and S. oralis.

S. mitis and S. oralis Strains
Fractions	SK 145	SK 100	ATCC 35037	NCTC 12261	CBR 515	CBR 1516	JA	JC	JD	JK	DBA 1
Protein
Infant 1	1.2	0.9	1.0	1.0	1.0	0.6	0.7	1.2	1.2	0.8	0.8
Infant 2	1.7	0.8	0.8	0.8	0.8	1.0	1.2	1.0	0.8	1.3	0.9
Infant 3	0.8	1.0	0.9	0.7	0.9	1.1	1.2	0.8	0.8	1.2	0.7
MEAN	1.2	0.9	0.9	0.8	0.9	0.9	1.1	1.0	0.9	1.1	0.8
Cell wall
Infant 1	1.2	1.0	0.9	1.6	1.0	1.1	1.1	1.0	1.8	1.1	1.0
Infant 2	1.5	1.1	1.0	1.6	1.0	1.1	1.1	1.3	2.1	1.1	2.4
Infant 3	1.1	1.0	1.1	1.8	1.1	1.6	1.2	1.3	2.1	1.0	2.7
MEAN	1.3	1.1	1.0	1.7	1.0	1.3	1.1	1.2	2.0	1.1	2.0
Protease wall
Infant 1	0.4	0.4	0.2	0.4	0.3	0.4	0.4	0.1	0.5	0.4	NS
Infant 2	0.4	0.3	0.5	0.5	0.2	0.4	0.5	0.3	0.4	0.4	NS
Infant 3	0.4	0.4	0.5	0.4	0.2	0.3	0.3	0.4	0.7	0.2	NS
MEAN	0.4	0.4	0.4	0.4	0.2	0.4	0.4	0.3	0.5	0.3	-
Membrane
Infant 1	1.4	1.3	1.6	1.3	1.5	1.5	2.1	1.2	1.8	1.3	1.6
Infant 2	1.5	1.7	1.7	1.5	1.4	1.8	1.5	2.1	1.8	1.8	2.8
Infant 3	1.6	1.1	1.6	1.4	1.5	1.3	2.1	2.0	2.1	1.8	1.9
MEAN	1.5	1.4	1.7	1.4	1.5	1.5	1.9	1.8	1.9	1.6	2.1