Volume 28, Number 5—May 2022
Research
Determining Existing Human Population Immunity as Part of Assessing Influenza Pandemic Risk
Jonathan Tin Lai Cheung, Tim K. Tsang, Hui-ling Yen, Ranawaka A.P.M. Perera, Chris Ka Pun Mok, Yong Ping Lin, Benjamin J. Cowling, and Malik Peiris
Table 1
Seroprevalence and geometric mean titer for swine influenza viruses of H1 and H3 subtype in serum specimens from 353 persons in Hong Kong and Guangzhou, China*
| Virus | Virus abbreviation | Virus lineage | No. (%) persons |
GMT | |
|---|---|---|---|---|---|
| Seroprevalence ≥40 | Seroprevalence ≥10 | ||||
| A/swine/HK/NS4003/2016 (H1N1) | NS4003 | EA | 34 (9.6) | 105 (29.7) | 7.67 |
| A/swine/GD/104/2013 (H1N1) | GD104 | EA | 39 (11.0) | 89 (25.2) | 7.84 |
| A/swine/HK/NS301/2013 (H1N2) | NS301 | TRIG | 27 (7.6) | 115 (32.6) | 7.76 |
| A/swine/HK/1436/2016 (H1N1) | TS1436 | Pandemic (pdm09) | 146 (41.4) | 222 (62.9) | 20.96 |
| A/swine/HK/4348/2016 (H3N2) | TS4348 | Seasonal (BD-like H3) | 239 (67.7) | 308 (87.3) | 48.77 |
*Serum samples were collected during 2013–2014 in Hong Kong and during 2015 in Guangzhou. BD, Binh Duong; EA, Eurasian avian-like; GMT, geometric mean titer; TRIG, triple-reassortant internal gene.
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