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 Chang
Table 1
HI antibody titers for influenza A(H5N2) virus in paired serum samples of 141 persons who had contact with infected poultry*
| HI titers | Total | Second sample |
Influenza vaccination history during previous 12 mo |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| <10 | 10 | 20 | 40 | 80 | ≥160 | A(H5N1) only | Seasonal only | Both | None | |||
| First sample | ||||||||||||
| <10 | 13 | 0 | 6 | 7 | 0 | 0 | 0 | 0 | 4 (30.8) | 7 (53.8) | 2 (15.4) | |
| 10 | 57 | 2 | 4 | 48 | 3 | 0 | 0 | 16 (28.1) | 5 (8.8) | 22 (38.6) | 14 (24.5) | |
| 20 | 32 | 0 | 5 | 11 | 15 | 1* | 0 | 3 (9.4) | 17 (53.1) | 3 (9.4) | 9 (28.1) | |
| 40 | 39 | 0 | 1 | 10 | 22 | 4* | 2* | 3 (7.7) | 13 (33.3) | 9 (23.1) | 14 (35.9) | |
| 80 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| ≥160 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Total | 141 | 2 | 16 | 76 | 40 | 5 | 2 | 22 (15.6) | 39 (27.7) | 41 (29.0) | 39 (27.7) | |
*Values are no. persons or no. (%) persons. Serum samples with hemagglutination inhibition (HI) titer >80 underwent microneutralization testing. Criteria for determining seroconversion in HI antibodies with regard to influenza A(H5N2) viruses: 1) a >4-fold increase in antibody titers in the paired serum samples; and 2) HI titer >80 for the second sample.
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