Table.
HI antibody titres against pandemic (H1N1) 2009 among healthcare personnel in Chumphae Hospital, Khon Kaen province, Thailand, 2009
| HI titre | High-risk group (n=120) (47%) | Intermediate risk group (n=82) (33%) | Low-risk group (n=53) (21%) | |||
|---|---|---|---|---|---|---|
| No. | % | No. | % | No. | % | |
| 20-≤10 | 50 | 42 | 53 | 65 | 29 | 55 |
| 40 | 38 | 32 | 15 | 18 | 12 | 23 |
| 80 | 23 | 19 | 10 | 12 | 9 | 17 |
| 160 | 8 | 6 | - | - | 3 | 5 |
| 320 | 1 | 1 | 3 | 4 | - | - |
| 640 | - | - | 1 | 1 | - | - |
Antibody response between high-risk group and intermediate risk group was significant (p<0.05);
HI titres of ≥40 were used as positive;
HI=Haemagglutination inhibition