TABLE 3.

ARCC for known-source isolates from Page Brook watershed^a

Sampling period (mo/yr) and source	No. of isolates	No. correctly identified	Rate of correct classification (%)	Largest source and % of misclassification
10/96–11/96b
Beef cows	226	192	85	Waterfowl, 8
Deer	214	184	86	Beef cows, 7
Humans	257	239	93	Waterfowl, 4
Waterfowl	195	174	89	Beef cows, 5
Total	892	789
8/98–9/98c
Beef cows	193	151	78	Waterfowl, 9
Deer	131	106	81	Beef cows, 10
Humans	152	131	86	Waterfowl, 8
Waterfowl	166	136	82	Beef cows, 9
Total	642	524

^aFor example, the first row of data shows that 15% of the beef cow isolates were incorrectly classified and that 8% were misclassified as waterfowl isolates. At least four different samples were collected for each known source. 

^bPrior to watershed project. The ARCC was 88%. 

^cNear completion of watershed project. The ARCC was 82%.