Table 1.

Avian influenza prevalence estimates for total shorebirds, Ruddy Turnstones (RUTU), and fecal samples at Delaware Bay, USA based on independent virus isolation results at St Jude Children’s Research Hospital (SJCRH, fecal samples) and the Southeastern Cooperative Wildlife Disease Study, UGA (All bird and RUTU samples).

Year	2003	2004	2005	2006	2007	2008	2009	Totalc
All birdsa	48/669 (7.2%)	20/534 (3.7%) ↓	36/858 (4.2%) ↑	63/768 (8.2%) ↑	21/994 (2.1%) ↓	103/1645 (6.3%) ↑	132/1145 (11.5%) ↑	423/6613 (6.4%)
RUTUa	46/441 (10.4%)	19/256 (7.4%) ↓	33/245 (13.5%) ↑	53/293 (18.1%) ↑	19/441 (4.3%) ↓	95/584 (16.3%) ↑	111/847 (13.1%) ↓	376/3107 (12.1%)
Overlapping sampling dateb	May 15-21	May 15-21	May 15-21	May 22-28	May 22-28	May 15-21	May 15-21
All birdsb	30/461 (6.5%)	20/534 (3.7%) ↓	13/337 (3.9%) ↑	30/363 (8.3%) ↑	10/147 (6.8%) ↓	40/747 (5.4%) ↓	12/264 (4.5%) ↓	155/2853 (5.5%)
RUTUb	29/294 (9.9%)	19/256 (7.4%) ↓	13/116 (11.2%) ↑	30/224 (13.4%) ↑	10/96 (10.4%) ↓	35/204 (17.2%) ↑	9/158 (5.7%) ↓	145/1348 (10.8%)
Fecesb	19/300 (6.3%)	14/500 (2.8%) ↓	36/595 (6.1%) ↑	43/575 (7.5%) ↑	39/574 (6.8%) ↓	47/610 (7.7%) ↑	63/624 (10.1%) ↑	261/3778 (6.9%)

^aThese samples include all birds sampled during May of each year by UGA.

^bThese samples were all collected during the same week where SJCRH and UGA sampling overlapped.

^cDifferences in prevalence estimates for the total sample were detected by chi square with Yate’s correction between All birds^a and RUTU^a (Χ²=92.295, df=1, P<0.0001), and within the overlapping sampling date between All birds^b and RUTU^b (Χ²=37.71, df=1, P<0.0001), All birds^b and Feces^b (Χ²=5.48, df=1, P<0.0192), and RUTU^b and Feces^b (Χ²=19.65, df=1, P<0.0001)