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Volume 20, Number 5—May 2014

Dispatch

Influenza A(H5N2) Virus Antibodies in Humans after Contact with Infected Poultry, Taiwan, 2012

Ho-Sheng Wu, Ji-Rong Yang, Ming-Tsan Liu, Chin-Hui Yang, Ming-Chu Cheng, and Feng-Yee ChangComments to Author 
Author affiliations: Centers for Disease Control, Taipei, Taiwan (H.-S. Wu, J.-R. Yang, M.-T. Liu, C.-H. Yang, F.-Y. Chang); Taipei Medical University, Taipei (H.-S. Wu); Animal Health Research Institute, Taipei (M.-C. Cheng); National Defence Medical Center, Taipei (F.-Y. Chang)

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Table 2

Serologic test results and vaccination and occupational histories for persons who had high antibody titers against influenza A(H5N2) virus and contact with infected poultry, Taiwan, 2012*†

Cont. no. Sample date Tested antigens, by influenza subtype
NS1-ELISA titer
Date and type of influenza vaccination
Occupation
H5N2
H5N1
H1N1pdm09
H3N2
HI MN HI NS1-pA NS1-pB A(H5N1) Seasonal
1 Mar 3 40 <20 80 <10 10 1.68 1.4 2012 Mar 3, 30 NA Poultry worker
Mar 30 80 230 80 <10 10
2 Mar 5 40 160 40 20 80 0.89 0.86 2012 Mar 6, 28 2011 Oct 8 Poultry worker
Mar 28 160 450 80 20 80
3 Mar 5 40 20 80 20 40 1.70 1.34 2012 Mar 5 2012 Jan 20 Animal health official
Mar 27 80 80 80 20 40
4 Mar 5 40 <20 40 10 40 1.13 1.09 2012 Mar 5, Apr 2 2012 Jan 20 Animal health official
Apr 2 80 80 40 10 40
5 Mar 6 40 20 40 <10 320 1.21 1.02 2012 Mar 6, Apr 2 2011 Nov 26 Temp. employee
Apr 2 80 30 40 <10 160
6 Mar 6 20 <20 40 <10 160 1.17 1.08 2012 Mar 6, Apr 2 2012 Mar 5 Temp. employee
Apr 2 80 160 80 <10 640
7 Mar 5 40 <20 40 <10 40 0.98 1.05 2012 Mar 5, Apr 2 2012 Mar 5 Temp. employee
Apr 2 320 1,280 160 10 640

*Cont., contact; HI, hemagglutination inhibition; MN, microneutralization; NS1, nonstructural protein 1; H1N1pdm09, pandemic influenza A(H1N1); NA, not applicable (did not receive vaccination); temp., temporary.
†Boldface indicates a >4-fold rise in antibody titer by HI or MN tests and a positive anti-NS1 antibody response by NS1-ELISA test between the first and second samples of paired serum samples. A positive anti-NS1 antibody response by NS1-ELISA assay was defined as each paired serum sample having a test absorbance of the second sample 30% higher than that of its first sample (ratio >1.30).

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