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Volume 13, Number 11—November 2007

Research

Role of Terrestrial Wild Birds in Ecology of Influenza A Virus (H5N1)

Adrianus C.M. Boon*1, Matthew R. Sandbulte*1, Patrick Seiler*, Richard J. Webby*, Thaweesak Songserm†, Yi Guan‡, and Robert G. Webster*Comments to Author 
Author affiliations: *St Jude Children's Research Hospital, Memphis, Tennessee, USA; †Medicine Kasetsart University, Nakorn Pathom, Thailand; ‡University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China;

Main Article

Table 1

Influenza A virus titers in oropharyngeal and cloacae swabs of infected birds*

Species
Virus
Mortality rate, %
Virus titer (EID50/mL) in swabs from infected animals
Day 2
Day 4
Day 6
T C T C T C
Sparrow
A/DK/TH/144/05 100 2.4 1.7 4.7 4.1 –†
A/Q/TH/551/05 100 1.0 <1 1.5 1.3 3.1 1.0
A/CM/HK/645/06 66 2.6 0.8 2.3 2.1 1.6 1.1
A/JW/HK/1038/06
100
2.1
<1

2.7
3.3



Day 2
Day 4
Day 6
T
C
T
C
T
C
Starling
A/DK/TH/144/05 0 3.8 0.8 3.3 <1 2 <1
A/Q/TH/551/05 0 ND ND ND ND ND ND
A/CM/HK/645/06 0 3.3 0.8 3.6 1 1.7 1.5
A/JW/HK/1038/06
0
2.5
1

2
<1

1.8
<1
Day 3
Day 5
Day 7
T
C
T
C
T
C
Pigeon A/DK/TH/144/05 0 <1 <1 <1 <1 <1 <1
A/Q/TH/551/05 0 <1 0.5 0.8 <1 <1 <1
A/CM/HK/645/06 0 1.9 <1 1.4 <1 <1 <1
A/JW/HK/1038/06‡ 0 0.5 <1 0.4 <1 <1 <1

*EID50, 50% egg infectious dose; T, oropharyngeal swab; C, cloacal swab; ND, not done.
†Birds did not survive the infection.
‡Swabs were taken on days 3, 6, and 10 after infection.

Main Article

1These authors contributed equally to the study.

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