Volume 21, Number 2—February 2015
Novel Reassortant Influenza A(H5N8) Viruses among Inoculated Domestic and Wild Ducks, South Korea, 2014
|Virus||Group||Illness†||Weight loss, %‡||Deaths (%)||HI titer§ (log2, mean±SD)|
|A/breeder duck/Kr/Gochang1/2014 (H5N8)
||Inoculated||3/5||32||1/5 (20)||2/5 (5.5 ± 0.7)|
|A/broiler duck/Kr/Buan2/2014 (H5N8)
||Inoculated||2/5||28||0/5||4/5 (7.5 ± 0.6)|
|A/Baikal teal/Kr/Donglim3/2014 (H5N8)
||Inoculated||3/5||34||1/5 (20)||3/5 (7.3)|
|Controls (no virus exposure)||0/3||–||0/3||0/3|
*Unless indicated otherwise, data represent the number of affected animals/ animals in the group. Animals were inoculated by the intranasal route with 106.5 egg-infective dose50/0.1 mL of the selected viruses; HI, hemagglutination inhibition.
†Severe depression, cloudy eye, and intermittent head-shaking.
‡Weight loss was measured at 11 d postinoculation and is expressed as a percentage of the weight of preinoculation ducks.
§HI titer was assayed in serum samples taken at 14 d postinoculation. Data show the ratio of antibody-positive animals to the number of virus-inoculated animals.
¶Three uninoculated birds were co-housed with infected birds as a contact group 8 h after inoculation.