S sanguis strain-dependent aggregation.

The lag time in platelet aggregation for a number of different strains of S sanguis. All strains are clinical isolates from patients with infective endocarditis, except for the laboratory strains NCTC 7863, which is the type strain, 12, 12Na, 10556, and SK96. The asterisk indicates a lag time significantly different from NCTC 7863 (P < .05). SK96 failed to aggregate within 30 minutes.