Table 2.
Serological evaluation of two patients with Guillain–Barré syndrome from Salvador, Brazil
| Test | Case 1 | Case 2 |
|---|---|---|
| IgM ELISA* | ||
| ZIKV | 0.765 | 1.357 |
| CHIKV | 0.092 | 0.093 |
| DENV | 0.062 | 0.181 |
| YFV | 0.041 | 0.094 |
| HI (IgG + IgM) | ||
| ZIKV | ≥ 1:1,280 | ≥ 1:1,280 |
| CHIKV | Negative | Negative |
| DENV-1 | 1:320 | ≥ 1:1,280 |
| DENV-2 | 1:640 | ≥ 1:1,280 |
| DENV-3 | 1:320 | ≥ 1:1,280 |
| DENV-4 | 1:640 | ≥ 1:1,280 |
| YFV | 1:160 | ≥ 1:1,280 |
| PRNT90 | ||
| ZIKV | 320 | > 2,560 |
| CHIKV | < 20 | < 20 |
| DENV-1 | > 640 | ND |
| DENV-2 | 320 | > 2,560 |
| DENV-3 | 160 | 1,280 |
| DENV-4 | 80 | 160 |
| YFV | < 20 | < 20 |
CHIKV = chikungunya virus; DENV = dengue virus; ELISA = enzyme-linked immunosorbent assay; HI = hemagglutination inhibition; ND = not determined; PRNT90 = plaque reduction neutralization test with a 90% neutralization cutoff; YFV = yellow fever virus; ZIKV = Zika virus. Positive values are in bold.
*
Optical densities, cutoff = 0.200.