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Volume 12, Number 11—November 2006
Research

Susceptibility of North American Ducks and Gulls to H5N1 Highly Pathogenic Avian Influenza Viruses

Justin D. Brown*Comments to Author , David E. Stallknecht*, Joan R. Beck†, David L. Suarez†, and David E. Swayne†
Author affiliations: *College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA; †Southeast Poultry Research Laboratory, Athens, Georgia, USA

Main Article

Table 1

Morbidity, mortality, and virus isolation data from 5 species of ducks and laughing gulls* intranasally inoculated with 2 different H5N1 HPAI viruses†

Virus/Host No. sick/total (‡) No. dead/total (§) Virus isolation (oral swab)
Virus isolation (cloacal swab)
Prevalence, no. positive/total Duration, days AMT¶
(log10 EID50/mL) Prevalence, no. positive/total Duration, days AMT
(log10 EID50/mL)
Mongolia/05
BWT 0/3 0/3 3/3 2 3.8 1/3 1 1.0
RD 0/3 0/3 3/3 1–4 2.8 2/3 1 1.2
WD 2/3 (5) 2/3 (7,8) 3/3 4–6 4.6 2/3 2,3 3.8
MD 0/3 0/3 3/3 (1) 1–3 3.1 1/3 (1) 1 1.0
NP 0/3 0/3 3/3 1–2 1.5 1/3 1 1.0
LG 3/3 (2–5) 2/3 (7,8) 3/3 7–8 4.2 3/3 4–7 2.6
Anyang/01
BWT 0/3 0/3 2/3 1,2 2.0 0/3 – –
RD 0/3 0/3 2/3 4 4.0 0/3 – –
WD 2/3 (6) 1/3 (8) 3/3 7 5.0 2/3 4,5 2.8
MD 0/3 0/3 3/3 1–2 2.1 1/3 1 1.0
NP 0/3 0/3 2/3 1,4 1.1 0/3 – –
LG 3/3 (3–5) 2/3 (9–10) 3/3 6–10 5.0 3/3 3–6 2.0

*Intranasally sham-inoculated control birds for each avian species lacked clinical, serologic, virologic, and pathologic evidence of avian influenza virus infection.
†HPAI, highly pathogenic avian influenza; BWT, blue-winged teal; RD, redhead; WD, wood duck; MD, mallard; NP, northern pintail, LG, laughing gull; Mongolia/05, A/Whooper Swan/Mongolia/244/05; Anyang/01, A/Duck Meat/Anyang/01.
‡No. in parentheses indicates the first day postinoculation that clinical disease was apparent.
§No. in parentheses indicates day of death.
¶Average maximum titer (AMT) is the average peak titer for birds that shed virus (log10 50% embryo infective dose/mL).

*Intranasally sham-inoculated control birds for each avian species lacked clinical, serologic, virologic, and pathologic evidence of avian influenza virus infection.
†HPAI, highly pathogenic avian influenza; BWT, blue-winged teal; RD, redhead; WD, wood duck; MD, mallard; NP, northern pintail, LG, laughing gull; Mongolia/05, A/Whooper Swan/Mongolia/244/05; Anyang/01, A/Duck Meat/Anyang/01.
‡No. in parentheses indicates the first day postinoculation that clinical disease was apparent.
§No. in parentheses indicates day of death.
¶Average maximum titer (AMT) is the average peak titer for birds that shed virus (log10 50% embryo infective dose/mL).

Main Article

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Page updated: October 14, 2011
Page reviewed: October 14, 2011
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