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 Sturm-Ramirez‡, and Robert G. Webster‡
Table 2
Experimental infection of khaki Campbell ducks with viruses isolated in Thailand, 2004–2005
| Virus* | Deaths† | Illness† | Day detectable virus was shed‡ |
||||
|---|---|---|---|---|---|---|---|
| 2 | 4 | 6 | 8 | 10 | |||
| A/duck/Thailand/144/05 | 5/10 | 3/10 | 10/10 | 9/9 | 1/5 | 0/5 | 0/5 |
| A/quail/Thailand/551/05 | 1/10 | 2/10 | 8/10 | 8/10 | 1/9 | 0/9 | 0/9 |
| A/Thailand/MK2/04 | 2/10 | 2/10 | 9/10 | 10/10 | 6/8 | 2/8 | 2/8 |
| A/duck/Thailand/71.1/04 | 10/10 | 10/10 | 10/10 | 1/1 | –§ | – | – |
*Eight 4-week-old khaki Campbell ducks were injected with 106 50% egg infectious dose of virus by intranasal and intratracheal infection, and 2 contact ducks were introduced 1 day later.
†Total number of deaths or birds showing disease/total number of birds. Birds were observed daily for signs of disease or death.
‡Number of ducks shedding by the trachea or cloacae/total number of ducks remaining alive. Ducks were swabbed every other day beginning on day 2 postinfection.
§All of the ducks in this group died.
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