TABLE 2.

Bacterial attachment to and invasion of, and IL-8 production by, HGEC^a

Strain	Attachment (%)b	Invasion (%)b	IL-8 production (pg/ml)c
B. forsythus ATCC 43037	1.90 ± 0.22	0.08 ± 0.04	146 ± 10
C. curvus ATCC 35224	0.04 ± 0.01	0.03 ± 0.01	794 ± 163
E. corrodens ATCC 23834	2.10 ± 0.30	0.01 ± 0.00	3,470 ± 41
F. nucleatum 12230	8.16 ± 0.07	2.88 ± 0.22	5,029 ± 1,807
F. nucleatum 12230 lam	0.41 ± 0.14	0.16 ± 0.02	NDd
P. gingivalis 381	8.57 ± 3.71	2.86 ± 0.14	312 ± 18
P. intermedia ATCC 49046	4.78 ± 0.48	0.13 ± 0.01	1,154 ± 323

^aThe assays were carried out as described in the text. Shown here are the mean results of one representative assay with standard deviations. Each experiment was carried out in duplicate. 

^bThe attachment and invasion levels were expressed as the percentage of bacteria retrieved following cell lysis relative to the total number of bacteria initially added. The background was <0.01% ± 0.00%. 

^cThe background was 68 ± 31 pg/ml. 

^dND, not determined.