TABLE 4.

Ratios of concentrations of anti-S. pneumoniae IgA determined by various EIAs to that in snap-frozen OraSure specimens (baseline) relative to the method of storage

Storage methodRatio of anti-S. pneumoniae IgA concn by indicated collection method to concn in snap-frozen OraSure specimen
OraSureOracolPastetteUnstimulated drooling
Snap-freezing1.001.061.011.34
Enzyme inhibition0.930.780.760.60
Plain1.060.710.590.42