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Volume 12, Number 4—April 2006

Synopsis

Domestic Ducks and H5N1 Influenza Epidemic, Thailand

Thaweesak Songserm*, Rungroj Jam-on*, Numdee Sae-Heng*, Noppadol Meemak†, Diane J. Hulse-Post‡, Katharine M. Sturm-Ramirez‡, and Robert G. Webster‡Comments to Author 
Author affiliations: *Kasetsart University, Nakornpathom, Thailand; †Western Veterinary Research and Development Center, Rachaburi, Thailand; ‡St. Jude Children's Research Hospital, Memphis, Tennessee, USA

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Table 1

Studies of H5N1 influenza in grazing ducks in Thailand, February to July 2004*

Flock no. Approximate no. ducks Age when positive for H5N1 virus (d) Duration of virus shedding before detection of illness or culling (d) Highest viral titer (log10 EID50/mL) Antibody titers to H5N1 (HI) (log2) before culling
1† 4,600 66 8 2.0 <1‡
5,200 78 10 3.1 2
3† 8,000 42 5 2.0 <1
4† 6,800 74 7 2.5 2
5† 4,300 93 5 3.3 2
7,200 59 5 3.6 2
10,000 82 7 ND ND
8† 6,300 60 9 3.8 2
9† 9,800 71 10 ND ND
10† 5.500 51 6 3.4 ND

*EID50, 50% egg infectious dose; HI, hemagglutination inhibition; ND, not done.
†Suphanburi Province.
‡Serum samples collected ≈12 d after flock moved to rice field.
§Nakornpathom Province.
¶Ayuthdhaya Province.

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