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Volume 18, Number 7—July 2012

Dispatch

Multiple Introductions of Avian Influenza Viruses (H5N1), Laos, 2009–2010

Stephanie SonnbergComments to Author , Phouvong Phommachanh, Tri Satya Putri Naipospos, Joanna McKenzie, Chintana Chanthavisouk, Som Pathammavong, Daniel Darnell, Phetlamphone Meeduangchanh, Adam M. Rubrum, Mahanakhone Souriya, Bounkhouang Khambounheuang, Richard J. Webby, Bounlom Douangngeun, and Robert G. Webster
Author affiliations: St. Jude Children’s Research Hospital, Memphis, Tennessee, USA (S. Sonnberg, D. Darnell, A.M. Rubrum, R.J. Webby, R.G. Webster); National Animal Health Centre, Vientiane, Laos (P. Phommachanh, P. Meeduangchanh, B. Douangngeun); Food and Agriculture Organization of the United Nations, Rome, Italy (T.S.P. Naipospos, J. McKenzie, C. Chanthavisouk, S. Pathammavong); and; Ministry of Agriculture and Forestry, Vientiane (M. Souriya, B. Khambounheuang)

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Table 2

Serum HI titers in ducks against avian influenza virus (H5N1) H3, H4, H5, H6, and H9 antigens, Laos, 2009–2010*

Serum sample ID Location† Sampling site HI test antigen subtype‡ (clade or lineage)§
H4 H5 (2.3.2) H5 (2.3.4) H6 H9 (G1) H9 (Y280)
790 Phongsaly-1 Backyard <10 <10 <5 <10 10 <10
797 Phongsaly-1 Backyard <10 <10 5 <10 <10 <10
798 Phongsaly-1 Backyard <10 <10 <5 <10 10 <10
925 Phongsaly-2 Backyard <10 <10 5 <10 <10 <10
11A Luang Namtha-1 Backyard <10 <10 <5 <10 10 10
11B Luang Namtha-1 Backyard <10 40 <5 <10 <10 10
12 Luang Namtha-1 Backyard <10 160 <5 <10 <10 <10
14 Luang Namtha-1 Backyard <10 160 40 <10 <10 <10
15 Luang Namtha-1 Backyard <10 320 <5 <10 <10 <10
1686 Luang Namtha-2 Backyard <10 <10 <5 <10 <10 640
1688 Luang Namtha-2 Backyard <10 <10 <5 <10 10 <10
1696 Luang Namtha-2 Backyard <10 <10 <5 <10 10 <10
1699 Luang Namtha-2 Backyard <10 <10 <5 <10 <10 320
1736 Luang Namtha-3 Market <10 <10 <5 <10 10 <10
757 Luang Namtha-3 Market <10 <10 10 <10 <10 <10
1314 Oudomxay-1 Backyard 80 <10 <5 80 <10 <10
1319 Oudomxay-1 Backyard 40 10 <5 320 <10 <10
1322 Oudomxay-2 Market <10 <10 <5 <10 <10 40
1324 Oudomxay-2 Market <10 <10 <5 <10 <10 10
1325 Oudomxay-2 Market <10 <10 <5 <10 <10 40
1350 Oudomxay-2 Market <10 <10 <5 <10 <10 160
1362 Oudomxay-3 Market 80 <10 <5 <10 <10 <10
1372 Oudomxay-3 Market <10 <10 <5 <10 <10 40
1459 Oudomxay-4 Backyard <10 <10 <5 640 320 320
1470 Oudomxay-5 Farm <10 <10 <5 <10 <10 10
24 Luang Prabang-1 Backyard <10 10 <5 <10 <10 <10
36 Luang Prabang-1 Backyard <10 <10 <5 <10 10 <10
37 Luang Prabang-1 Backyard <10 <10 <5 <10 10 <10
38 Luang Prabang-1 Backyard <10 <10 <5 <10 10 <10
951 Luang Prabang-2 Backyard <10 <10 5 <10 <10 <10
958 Luang Prabang-2 Backyard <10 <10 5 <10 10 <10
721 Xiengkhouang-3 Backyard <10 10 <5 <10 <10 <10
1673 Xiengkhouang-4 Farm <10 <10 <5 <10 <10 10
1378 Vientiane-1 Backyard 640 <10 <5 <10 20 40
1379 Vientiane-1 Backyard <10 <10 <5 <10 10 <10
1381 Vientiane-1 Backyard 40 <10 <5 <10 20 <10
1382 Vientiane-1 Backyard <10 <10 <5 <10 10 <10
1386 Vientiane-1 Backyard 40 <10 <5 <10 <10 40
1389 Vientiane-1 Backyard <10 <10 <5 <10 10 <10
1393 Vientiane-1 Backyard 40 <10 <5 <10 <10 <10
1526 Vientiane-2 Farm <10 <10 <5 <10 <10 10
463 Vientiane-1 Market <10 <10 <5 <10 160 320
464 Vientiane-1 Market <10 <10 <5 <10 >1,280 >1,280
467 Vientiane-1 Market <10 <10 <5 <10 160 160
468 Vientiane-1 Market <10 <10 <5 <10 <10 80
1245 Vientiane-2 Backyard <10 <10 <5 <10 <10 10
1249 Vientiane-2 Backyard <10 10 <5 <10 <10 <10
1277 Vientiane-2 Backyard <10 10 <5 <10 <10 <10
1419 Vientiane-3 Market 20 <10 <5 <10 <10 <10
657 Savanakhet-2 Farm <10 <10 <5 <10 10 10
990 Savanakhet-3 Farm <10 <10 10 <10 <10 <10
589 Champasak-2 Backyard <10 <10 <5 <10 40 <10
606 Champasak-3 Backyard <10 <10 20 <10 10 10

*H, hemagglutinin; ID, identification; HI, hemagglutination inhibition.
†Identical numbers indicate same sampling site.
‡All titers for H3 (A/duck/Laos-Xaythany/A0573/2007) were <10. H4, A/duck/Czech/1956; H5 clade 2.3.2, A/common magpie/Hong Kong/5052/2007; H5 clade 2.3.4, A/duck/Laos/3295/2006; H6, A/turkey/Massachusetts/1965; H9 lineage G1, A/Hong Kong/33982/2009; H9 lineage Y280, A/duck/Hong Kong/Y280/1997.
§Values represent HI titers reciprocal to the highest dilution of serum that inhibited haemagglutination of 4 hemagglutination units of antigen by using 0.5% chicken erythrocytes.

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