Table 4. Quantification of 16S gene copies in Culture Negative BAL.

BAL ID #	Pathology Lab Results	16S rRNA gene copies/ μl ± SEM
32	No Growth	297,733±14,133
34	No Growth	187,667±5,333
42	No Growth	7,700 ± 503
69	No Growth	19,373 ± 397
70	No Growth	141,067 ± 1,827
133	Respiratory Tract Flora	undetermined
137	No Growth	835,800±29,631
164	No Growth	1,345,333±21,333
186	No Growth	24,267 ± 624
189	No Growth	21,840±706
196	No Growth	10,860 ± 1,244
197	No Growth	6,160 ± 136
201	No Growth	252,533±9,354
208	No Growth	93,333±6,967
209	No Growth	134,000 ± 5,108