TABLE 1.

Specificity of antibody probes^a

Sampling location	No. of ENT-positive cells per DAPI- positive cell	No. of Dps- or Fis-positive cells per DAPI-positive cell
Influent	31.77 ± 19.70	27.97 ± 15.46
Aerated grit removal	25.65 ± 17.70	23.33 ± 19.53
Primary clarifier	38.50 ± 22.38	36.93 ± 20.83
Trickling filter	9.94 ± 3.91	12.70 ± 2.63
Submerged aeration basin	8.22 ± 3.22	10.20 ± 3.88
Surface aeration basin	5.92 ± 2.64	5.77 ± 3.73
Pooled secondary clarifier	9.84 ± 4.72	7.53 ± 3.65

^aValues are means ± standard deviations.