Table 1.
Positive rates of CHIKV infection in South Asia and Southeast Asia regions
| Country | Total no. of samples | CHIKV IgM and/or IgG ELISA positives | CHIKV FRNT tested samples | CHIKV FRNT positives in ELISA positives | CHIKV neutralization- confirmed cases (A × B) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| IgM | IgG | Total* | Positive rate (A) | IgM | IgG | Total* | IgM | IgG | Total* | Positive rate (B) | FRNT50 GMT | |||
| Myanmar | 225 | 4 | 29 | 32 (1) | 14·2% | 4 | 25 | 28 (1) | 2 | 8 | 9 (1) | 32·1% | 34 | 4·6% |
| Sri Lanka | 121 | 2 | 46 | 48 | 39·7% | 2 | 37 | 39 | 1 | 5 | 6 | 15·4% | 25 | 6·1% |
| Indonesia | 198 | 7 | 87 | 88 (6) | 44·4% | 7 | 80 | 81 (6) | 7 | 49 | 50 (6) | 61·7% | 205 | 27·4% |
| Philippines | 160 | 7 | 92 | 98 (1) | 61·3% | 7 | 83 | 89 (1) | 5 | 35 | 39 (1) | 43·8% | 87 | 26·8% |
| Vietnam | 44 | 0 | 22 | 22 | 50·0% | 0 | 22 | 22 | 0 | 11 | 11 | 50·0% | 90 | 25·0% |
| Total | 748 | 20 | 276 | 288 (8) | 38·5% | 20 | 247 | 259 (8) | 15 | 108 | 115 (8) | 44·4% | 17·1% | |
CHIKV, Chikungunya virus; FRNT50, 50% focus reduction neutralization test; GMT, geometric mean titre.
*
Both IgM- and IgG-positive cases.