TABLE 1.

Detection of multiple strains of P. gingivalis in clinical samples

Study population	No. positive/ no. of subjects (%)	No. (%) of positive samples with ≥2 strains	No. (%) of positive samples with ≥3 strains
Subjects recruited from clinics of colleges of dentistry
The Ohio State University	92/148 (62)	28 (30)	6 (7)
University of California, San Francisco	67/74 (91)	45 (67)	2 (3)
University of Texas Health Science Center at San Antonio	55/104 (53)	15 (27)	0 (0)
Ohio State University students newly immigrated to the United States	211/292 (72)	92 (44)	20 (9)
Randomly selected subjects from extended families in Columbus, Ohio	236/565 (42)	48 (20)	4 (2)
Total	661/1,183 (56)	228 (34)	32 (5)