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Volume 16, Number 8—August 2010

Research

Multiyear Surveillance for Avian Influenza Virus in Waterfowl from Wintering Grounds, Texas Coast, USA

Pamela J. Ferro, Christine M. Budke, Markus J. Peterson, Dayna Cox, Emily Roltsch, Todd Merendino1, Matt Nelson, and Blanca LupianiComments to Author 
Author affiliations: Texas A&M University, College Station, Texas, USA (P.J. Ferro, C.M. Budke, M.J. Peterson, D. Cox, E. Roltsch, B. Lupiani); Texas Parks and Wildlife Department, Bay City, Texas, USA (T. Merendino, M. Nelson); 1Current affiliation: Ducks Unlimited, Texas Gulf Coast, Richmond, Texas, USA.

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Table A1

Apparent prevalence of avian influenza virus in various waterfowl and wetland-associated game bird species as determined by VI and real-time RT-PCR from cloacal swabs collected from hunter-harvested waterfowl, Texas mid–Gulf Coast, USA, September 2006–January 2007*

Species
No. tested
Real-time RT-PCR,† 
no. (%)
VI,† no. (%)
Isolate‡
American wigeon (Anas americana) 171 4 (2.3) 0
Fulvous whistling duck (Dendrocygna bicolor) 18 2 (11.1) 1 (5.6) H6N1
Lesser scaup (Aythya affinis) 60 1 (1.7) 1 (1.7) H10N7
Mallard (Anas platyrhynchos) 5 1 (20.0) 0
Mottled duck (Anas fulvigula) 33 2 (6.1) 1 (3.0) H6N5
Northern pintail (Anas acuta) 72 5 (6.9) 0
Northern shoveler (Anas clypeata) 360 23 (6.4) 5 (1.3) H2N9, H3N8, H4N2, H4N6, H4N8
Redhead (Aythya amercana) 51 2 (3.9) 0
Ring-necked duck (Aythya collaris) 35 1 (2.9) 0
Ruddy duck (Oxyura jamaicensis) 31 2 (6.5) 0
Teal, blue-winged (Anas discors) 610 65 (10.7) 19 (3.1) H1N1, H2N9, H3N6, H3N8 (6), H4N2, H4N6, H4N8, H6N1 (3), H6N1/4, H6N5, H6N6, H6N8
Teal, green-winged (Anas crecca) 358 31 (8.7) 5 (1.4) H1N1, H6N2, H7N3, H10N7, H11N3
Snow goose (Chen eaerulescens)
46
2 (4.4)
0

Total§ 2,171 141 (6.5) 32 (1.5)

*VI, virus isolation; RT-PCR, reverse transcription–PCR.
†Number positive (apparent prevalence). Numbers and apparent prevalences for VI are after RT-PCR result.
‡Isolates typed by the National Veterinary Services Laboratory. Included are VI that were RT-PCR negative on the original sample.
§Other species sampled that were negative for AI by RT-PCR and VI, number sampled: American coot (Fulica americana), 25; black-bellied whistling duck (Dendrocygna autumnalis), 6; bufflehead (Bucephala albeola), 2; canvasback (Aythya valisineria), 16; cinnamon teal (Anas cyanoptera), 1; common goldeneye (Bucephala clangula), 1;common moorhen (Gallinula chloropus), 1; common snipe (Gallinago gallinago), 1; gadwall (Anas strepera), 247; greater white-front goose (Anser albifrons), 3; hooded merganser (Laphodytes cucullatus), 11; mottled duck x mallard hybrid (Anas fulvigula x Anas platyrhynchos), 1; Ross’s goose (Anser albifrons), 2; sandhill crane (Grus candensis), 1; wood duck (Aix sponsa), 1; and unidentified teal, 2.

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1Current affiliation: Ducks Unlimited, Texas Gulf Coast, Richmond, Texas, USA.

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