Table 1. Number of samples taken from species groups, the number of birds sampled, the number of positive birds, the percentage positive and the 95% confidence interval associated with the prevalence estimate.

Species Group	No. of samples	No. of birds sampled	No. of AIV-positive birds	% birds positive	95% confidence interval
Dabbling ducks	2845	1418	25	1.76	0.09
Diving ducks	142	71	0	0	*
Other ducks	54	27	2	7.4	2.79
Other waterbirds	273	136	1	0.7	0.05
Geese	36	18	0	0	*
Gulls	2994	2545	53	2	0.08
Galliformes	796	398	1	0.25	0.007
Rails and Crakes	845	422	2	0.47	0.01
Terns	261	131	0	0	*
Passerines	65	33	0	0	*
Raptors	42	21	0	0	*
	8343	5220	84	1.62	0.020

The bird species included in each species group are shown in Table S1.