Table 4. Serostatus histories for 82 mallards captured on multiple occasions during the winter of 2014/15 in Anchorage, Alaska.

Serostatus of juvenile (HY) and adult (AHY) mallards was determined to be either negative (-) or positive (+) through bELISA.

Group	(n)	(-)→(-)	(+)→(+)	(-)→(+)	(+)→(-)
AHY	43	15	24	2	2
HY	39	18	6	6	9
Total	82	33	30	8	11